tag:blogger.com,1999:blog-22602647929347651382024-03-13T11:38:24.863-03:00Física...em construçãoAlex Fariashttp://www.blogger.com/profile/05866403100330572843noreply@blogger.comBlogger16125tag:blogger.com,1999:blog-2260264792934765138.post-83957980206252365062016-04-13T15:01:00.004-03:002016-04-23T11:21:04.989-03:00Condutores em Equilíbrio Eletrostático<div style="text-align: right;">
Por Alex Farias</div>
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<span style="color: #5c5c5c; font-family: "arial" , "sans-serif"; mso-fareast-font-family: "Times New Roman"; mso-fareast-language: PT-BR;">Condutor em equilíbrio
eletrostático<o:p></o:p></span></div>
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<span style="font-family: "times new roman" , "serif"; font-size: 12.0pt; line-height: 150%;">Dizemos que um condutor eletrizado
está em equilíbrio eletrostático, quando em seu interior ou superfície não
existe movimento ordenado de portadores de carga elétrica. </span><span style="font-family: "times new roman" , serif; font-size: 12pt; line-height: 150%;">Como o excesso de carga tem o mesmo
sinal, essas tendem a se afastar ao máximo uma das outras, desta forma elas
se distribuem na superfície do condutor seja ele oco ou maciço.</span><br />
<span style="font-family: "times new roman" , serif; font-size: 12pt; line-height: 150%;"><br /></span></div>
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<span style="font-family: "times new roman" , "serif"; font-size: 12.0pt; line-height: 150%;"> <b>Propriedades
de um condutor em equilíbrio eletrostático<o:p></o:p></b></span></div>
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<li style="text-align: justify;"><span style="font-family: "symbol"; font-size: 12pt; line-height: 150%; text-indent: -18pt;"><span style="font-family: "times new roman"; font-size: 7pt; font-stretch: normal; line-height: normal;"> </span></span><span style="font-family: "times new roman" , serif; font-size: 12pt; line-height: 150%; text-indent: -18pt;">No interior de um condutor em
equilíbrio eletrostático, o campo elétrico</span><span style="font-family: "times new roman" , serif; font-size: 12pt; line-height: 150%; text-indent: -18pt;"> é nulo e o potencial elétrico constante;</span></li>
<li style="text-align: justify;"><span style="font-family: "times new roman" , serif; font-size: 12pt; line-height: 150%; text-indent: -18pt;">No exterior o campo elétrico é
não nulo e é normal a superfície e o potencial elétrico é constante, visto
que as cargas elétricas não se movimentam;</span></li>
<li style="text-align: justify;"><span style="font-family: "times new roman" , serif; font-size: 12pt; line-height: 150%; text-indent: -18pt;">A densidade de carga é maior nas
partes pontiagudas de um condutor eletrostático maciço ou oco.</span></li>
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" imageanchor="1" style="clear: left; margin-bottom: 1em; margin-left: auto; margin-right: auto;"><img alt="Resultado de imagem para para raio" border="0" height="200" 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" width="139" /></a></td></tr>
<tr><td class="tr-caption" style="text-align: center;">Para raios</td></tr>
</tbody></table>
<div class="MsoListParagraphCxSpLast" style="line-height: 150%; margin-bottom: .0001pt; margin-bottom: 0cm; mso-add-space: auto; text-align: justify;">
<span style="font-family: "times new roman" , "serif"; font-size: 12.0pt; line-height: 150%;">Devido </span><span style="font-family: "times new roman" , serif; font-size: 12pt; line-height: 150%;">a essa terceira característica a
engenharia elétrica desenvolveu os para raios, que como sabemos são sempre
pontiagudos e utilizados na proteção contra raios.</span></div>
<div class="MsoListParagraphCxSpLast" style="line-height: 150%; margin-bottom: .0001pt; margin-bottom: 0cm; mso-add-space: auto; text-align: justify;">
</div>
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<br /></div>
<div class="MsoNormal" style="line-height: 150%; margin-bottom: .0001pt; margin-bottom: 0cm; text-align: justify;">
<span style="font-family: "times new roman" , "serif"; font-size: 12.0pt; line-height: 150%;">Outra consequência importante devido a
essas características, especialmente para a fabricação de aparelhos
eletrônicos é a blindagem eletrostática, que evita que estes aparelhos sejam
danificados. <a href="https://drive.google.com/file/d/0B41RpOUJ4tNrQjJHeTgwY1oyMTA/view?usp=sharing" target="_blank">Michael Faraday</a> comprovou experimentalmente tão fenômeno ao
manter-se dentro de uma gaiola metálica e esta ser eletrizada e ele não ser
eletrocutado. Esse princípio é o mesmo utilizado na proteção contra
danificações por descarga elétrica em aviões, carros, edifícios entre outros.<o:p></o:p></span></div>
<table align="center" cellpadding="0" cellspacing="0" class="tr-caption-container" style="margin-left: auto; margin-right: auto; text-align: center;"><tbody>
<tr><td style="text-align: center;"><img alt="Resultado de imagem para condutor em equilíbrio" src="https://encrypted-tbn1.gstatic.com/images?q=tbn:ANd9GcQhQT1lQ7SRYDtNj4wvhM4_W9YkdLoTzl2voZyi9EEb-c1ydUHWCg" style="margin-left: auto; margin-right: auto;" /></td></tr>
<tr><td class="tr-caption" style="text-align: center;">Gaiola de Faraday</td></tr>
</tbody></table>
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</td>
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<tr>
<td style="border-top: none; border: solid windowtext 2.25pt; mso-border-top-alt: solid windowtext 2.25pt; padding: 0cm 5.4pt 0cm 5.4pt; width: 436.0pt;" valign="top" width="581"><div align="right" class="MsoNormal" style="margin-bottom: 0.0001pt; text-align: right;">
<span style="font-family: "arial" , sans-serif;"> </span><a href="http://fisicaemconstrucaomeublog.blogspot.com.br/p/3-ano.html"><span style="color: #1155cc; font-family: "arial" , "sans-serif";">3º ano</span></a><span style="font-family: "times new roman" , "serif"; font-size: 14.0pt;"><o:p></o:p></span></div>
</td>
</tr>
</tbody></table>
Alex Fariashttp://www.blogger.com/profile/05866403100330572843noreply@blogger.com2tag:blogger.com,1999:blog-2260264792934765138.post-63401926754032178222016-03-28T07:31:00.001-03:002016-03-28T07:31:38.232-03:00Campo elétrico Uniforme<span id="docs-internal-guid-26964581-bcc4-04b2-df9f-01c7500bdc61"><br /></span>
<div dir="ltr" style="margin-left: 19.5pt;">
<table style="border-collapse: collapse; border: none;"><colgroup><col width="568"></col></colgroup><tbody>
<tr style="height: 0px;"><td style="border-bottom: solid #000000 3px; border-left: solid #000000 3px; border-right: solid #000000 3px; border-top: solid #000000 3px; padding: 7px 7px 7px 7px; vertical-align: top;"><div dir="ltr" style="line-height: 1.38; margin-bottom: 0pt; margin-top: 0pt; text-align: right;">
<span style="background-color: white; color: #5c5c5c; font-family: Arial; font-size: 16px; font-style: normal; font-variant: normal; font-weight: 400; text-decoration: none; vertical-align: baseline; white-space: pre-wrap;">Por: Alex Farias</span></div>
</td></tr>
<tr style="height: 0px;"><td style="border-bottom: solid #000000 3px; border-left: solid #000000 3px; border-right: solid #000000 3px; border-top: solid #000000 3px; padding: 7px 7px 7px 7px; vertical-align: top;"><div dir="ltr" style="line-height: 1.7999999999999998; margin-bottom: 0pt; margin-top: 0pt; text-align: justify;">
<span style="background-color: white; color: #5c5c5c; font-family: Arial; font-size: 16px; font-style: normal; font-variant: normal; font-weight: 400; text-decoration: none; vertical-align: baseline; white-space: pre-wrap;">Um campo elétrico é uniforme quando tem as mesmas características em todas as suas extensões. Nesse caso o vetor campo elétrico, possui mesmo modulo, direção e sentido, num campo uniforme as linhas de campo são paralelas.</span></div>
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<span style="background-color: #f5f6fb; color: #333333; font-family: Arial; font-size: 14.666666666666666px; font-style: normal; font-variant: normal; font-weight: 400; text-decoration: none; vertical-align: baseline; white-space: pre-wrap;"><img alt="num campo uniforme as linhas de força são retas e paralelas" height="121" src="https://lh6.googleusercontent.com/M08XgFZHoxpi-KpN5QxC0XpzLcBDet6KaO1nyDuWS7SVuhzaMnlMzPx484DoiPfBVhLJ8_W4ue_4uvgU2hp0yzsf0EIlDtZucciF3KtmfyVfpWMXkRTNh2GcGqQcxk6R-doXgeA1" style="-webkit-transform: rotate(0.00rad); border: none; transform: rotate(0.00rad);" title="num campo uniforme as linhas de força são retas e paralelas" width="499" /></span></div>
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<span style="background-color: white; color: #5c5c5c; font-family: Arial; font-size: 16px; font-style: normal; font-variant: normal; font-weight: 400; text-decoration: none; vertical-align: baseline; white-space: pre-wrap;">Um campo elétrico uniforme pode ser formado por duas placas condutoras paralelas entre si, nas quais exista uma diferença de potencial constante .</span></div>
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<tr style="height: 0px;"><td style="border: 3px solid rgb(0, 0, 0); padding: 7px; text-align: right; vertical-align: top;"><a href="http://fisicaemconstrucaomeublog.blogspot.com.br/p/3-ano.html">3º Ano</a></td></tr>
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Alex Fariashttp://www.blogger.com/profile/05866403100330572843noreply@blogger.com0tag:blogger.com,1999:blog-2260264792934765138.post-44671049452719874032016-03-18T09:49:00.004-03:002016-03-27T10:35:40.172-03:00Linhas de Força<span id="docs-internal-guid-99957ec2-89c7-2f95-f06d-1aa42e7a483c"></span>
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<table style="border-collapse: collapse; border: none;"><colgroup><col width="585"></col></colgroup><tbody>
<tr style="height: 0px;"><td style="border-bottom: solid #000000 1px; border-left: solid #000000 3px; border-right: solid #000000 3px; border-top: solid #000000 3px; padding: 7px 7px 7px 7px; vertical-align: top;"><div dir="ltr" style="line-height: 1.2; margin-bottom: 0pt; margin-top: 0pt; text-align: center;">
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<span style="background-color: transparent; color: black; font-family: "arial"; font-size: 14.666666666666666px; font-style: normal; font-variant: normal; font-weight: 400; text-decoration: none; vertical-align: baseline; white-space: pre-wrap;">Por: Alex Farias</span></div>
<span style="background-color: transparent; color: black; font-family: "arial"; font-size: 14.666666666666666px; font-style: normal; font-variant: normal; font-weight: 400; text-decoration: none; vertical-align: baseline; white-space: pre-wrap;"><img height="166" src="https://lh5.googleusercontent.com/bePovnJEC93be-trzyDT0aQEunl_z1t6mNdKG1g5_Rc5Z_dCRN6G_h9aHwF038BSU6MAt3ePMua1AZwg5httWygI9zYqySs4NOmuMqZd7xAYgi-OmR2sxbr6B7WdD7-4xnkM1Ig-" style="-webkit-transform: rotate(0.00rad); border: none; transform: rotate(0.00rad);" width="361" /></span></div>
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<tr style="height: 0px;"><td style="border-bottom: solid #000000 1px; border-left: solid #000000 3px; border-right: solid #000000 3px; border-top: solid #000000 1px; padding: 7px 7px 7px 7px; vertical-align: top;"><div dir="ltr" style="line-height: 1.7999999999999998; margin-bottom: 0pt; margin-top: 0pt; text-align: justify;">
<span style="background-color: transparent; color: black; font-family: "arial"; font-size: 14.666666666666666px; font-style: normal; font-variant: normal; font-weight: 400; text-decoration: none; vertical-align: baseline; white-space: pre-wrap;">Ao trabalharmos os conceitos de campo elétrico, na representação do sentido da força elétrica utilizamos um conjunto de linhas imaginárias, que passa por uma carga de prova positiva, presente nesse campo sempre tangencialmente a está. </span></div>
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<div dir="ltr" style="line-height: 1.7999999999999998; margin-bottom: 0pt; margin-top: 0pt; text-align: justify;">
<span style="background-color: transparent; color: black; font-family: "arial"; font-size: 14.666666666666666px; font-style: normal; font-variant: normal; font-weight: 400; text-decoration: none; vertical-align: baseline; white-space: pre-wrap;">Essa forma de estudar campo elétrico, foi introduzida pelo físico inglês </span><a href="https://drive.google.com/file/d/0B41RpOUJ4tNrQjJHeTgwY1oyMTA/view?usp=sharing" style="text-decoration: none;" target="_blank"><span style="background-color: transparent; color: #1155cc; font-family: "arial"; font-size: 14.666666666666666px; font-style: normal; font-variant: normal; font-weight: 400; text-decoration: underline; vertical-align: baseline; white-space: pre-wrap;">Michael Faraday</span></a><span style="background-color: transparent; color: black; font-family: "arial"; font-size: 14.666666666666666px; font-style: normal; font-variant: normal; font-weight: 400; text-decoration: none; vertical-align: baseline; white-space: pre-wrap;">, que fez grandes contribuições para o estudo da eletricidade.</span></div>
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<div dir="ltr" style="line-height: 1.7999999999999998; margin-bottom: 0pt; margin-top: 0pt; text-align: justify;">
<span style="background-color: transparent; color: black; font-family: "arial"; font-size: 14.666666666666666px; font-style: normal; font-variant: normal; font-weight: 400; text-decoration: none; vertical-align: baseline; white-space: pre-wrap;">Nas proximidades de uma carga pontual essas linhas de campo tem o seguinte comportamento: </span><span style="background-color: transparent; color: black; font-family: "arial"; font-size: 14.666666666666666px; font-style: italic; font-variant: normal; font-weight: 400; text-decoration: underline; vertical-align: baseline; white-space: pre-wrap;">Nascem</span><span style="background-color: transparent; color: black; font-family: "arial"; font-size: 14.666666666666666px; font-style: normal; font-variant: normal; font-weight: 400; text-decoration: none; vertical-align: baseline; white-space: pre-wrap;"> nas cargas positivas e </span><span style="background-color: transparent; color: black; font-family: "arial"; font-size: 14.666666666666666px; font-style: normal; font-variant: normal; font-weight: 400; text-decoration: underline; vertical-align: baseline; white-space: pre-wrap;">m</span><span style="background-color: transparent; color: black; font-family: "arial"; font-size: 14.666666666666666px; font-style: italic; font-variant: normal; font-weight: 400; text-decoration: underline; vertical-align: baseline; white-space: pre-wrap;">orrem</span><span style="background-color: transparent; color: black; font-family: "arial"; font-size: 14.666666666666666px; font-style: normal; font-variant: normal; font-weight: 400; text-decoration: none; vertical-align: baseline; white-space: pre-wrap;"> nas cargas negativas, conforme a figura abaixo.</span></div>
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<span style="background-color: transparent; color: black; font-family: "arial"; font-size: 14.666666666666666px; font-style: normal; font-variant: normal; font-weight: 400; text-decoration: none; vertical-align: baseline; white-space: pre-wrap;"><img height="198" src="https://lh6.googleusercontent.com/N48S_q7forrJhA8wSmHM8SUwVZ3mZs2xMneEMo1IUJPq_Itabu5qrXTBp2Go4OkwkMi0wA9JDlnEJIHntP8YXpzGpVPbNURZeHSv5vesCQDSYzbU02nFF-XZP8qdlA7m2GyicFw0" style="-webkit-transform: rotate(0.00rad); border: none; transform: rotate(0.00rad);" width="385" /></span></div>
<div dir="ltr" style="line-height: 1.7999999999999998; margin-bottom: 0pt; margin-top: 0pt; text-align: justify;">
<span style="background-color: transparent; color: black; font-family: "arial"; font-size: 14.666666666666666px; font-style: normal; font-variant: normal; font-weight: 400; text-decoration: none; vertical-align: baseline; white-space: pre-wrap;">Ao colocarmos duas cargas próximas haverá interação elétrica elas ,podendo ser de atração entre cargas de sinais opostos ou de repulsão caso tenham sinais iguais, nesses dois casos as linhas de campo irão ter o comportamento conforme a figura abaixo:</span></div>
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<span style="background-color: transparent; color: black; font-family: "arial"; font-size: 14.666666666666666px; font-style: normal; font-variant: normal; font-weight: 400; text-decoration: none; vertical-align: baseline; white-space: pre-wrap;"><img height="341" src="https://lh6.googleusercontent.com/BV0KN0d0d3jylG_4M45pKMQp1dcQViLK4Aw1IMOfJh6OVKGfIbQRfRw6-vMsF5A71h5K_bSjW1-uRYm1jOl8-DZ87X4OUeJKelA-BxikuNO_S_3Powh3uh5KfYua0LBFTrqseqnK" style="-webkit-transform: rotate(0.00rad); border: none; transform: rotate(0.00rad);" width="327" /></span></div>
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<a href="http://fisicaemconstrucaomeublog.blogspot.com.br/p/3-ano.html" style="text-decoration: none;"><span style="background-color: transparent; color: #1155cc; font-family: "arial"; font-size: 14.666666666666666px; font-style: normal; font-variant: normal; font-weight: 400; text-decoration: underline; vertical-align: baseline; white-space: pre-wrap;">3º ano</span></a></div>
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Alex Fariashttp://www.blogger.com/profile/05866403100330572843noreply@blogger.com0tag:blogger.com,1999:blog-2260264792934765138.post-3855304566457752992016-03-08T08:57:00.002-03:002016-03-27T10:34:44.932-03:00Campo Elétrico de uma Carga Puntiforme<table border="1" cellpadding="0" cellspacing="0" class="MsoTableGrid" style="border-collapse: collapse; border: none; text-align: right;">
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<span style="font-family: "times new roman" , "serif"; font-size: 14.0pt;"> Por: Alex Farias<o:p></o:p></span></div>
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<a href="https://4.bp.blogspot.com/-BPZFEohHKkU/Vur8JiQVb6I/AAAAAAAABSY/_brF7ZdIcnApYAnvqQAXTiFpFKr6WKeHQ/s1600/figura.png" imageanchor="1" style="margin-left: 1em; margin-right: 1em;"><img border="0" src="https://4.bp.blogspot.com/-BPZFEohHKkU/Vur8JiQVb6I/AAAAAAAABSY/_brF7ZdIcnApYAnvqQAXTiFpFKr6WKeHQ/s1600/figura.png" /></a></div>
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<span style="font-family: "times new roman" , "serif"; font-size: 12.0pt; line-height: 150%;">O campo elétrico criado nas
proximidades de uma carga elétrica puntiforme pode ser calculado pela
expressão a seguir:<o:p></o:p></span></div>
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<span style="font-family: "times new roman" , "serif"; font-size: 12.0pt; line-height: 150%;">E = F/q<o:p></o:p></span></div>
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<span style="font-family: "times new roman" , "serif"; font-size: 12.0pt; line-height: 150%;">Se considerarmos uma carga pontual Q,
no vácuo e um ponto situado a uma distância d, dessa carga, ao colocarmos uma
carga de prova neste ponto, podemos calcular o valor do campo elétrico,
utilizando a Lei de Coulomb.<o:p></o:p></span></div>
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<span style="font-family: "times new roman" , "serif"; font-size: 12.0pt; line-height: 150%;">F = K. Q.q / d<sup>2<o:p></o:p></sup></span></div>
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<span style="font-family: "times new roman" , "serif"; font-size: 12.0pt; line-height: 150%;">E = K. Q.q / q. d<sup>2<o:p></o:p></sup></span></div>
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<span style="font-family: "times new roman" , "serif"; font-size: 12.0pt; line-height: 150%;">Assim:<o:p></o:p></span></div>
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<span style="font-family: "times new roman" , "serif"; font-size: 12.0pt; line-height: 150%;">E = K.Q / d<sup>2</sup><o:p></o:p></span><br />
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<span style="font-family: "times new roman" , "serif"; font-size: 12.0pt; line-height: 150%;"><span style="background-color: white; font-family: "times new roman"; vertical-align: baseline; white-space: pre-wrap;">No SI, o valor da constante eletrostática é: K = 9,0 . 10</span><span style="background-color: white; font-family: "times new roman"; font-size: 9.6px; vertical-align: super; white-space: pre-wrap;">9</span><span style="background-color: white; font-family: "times new roman"; vertical-align: baseline; white-space: pre-wrap;"> N.m</span><span style="background-color: white; font-family: "times new roman"; font-size: 9.6px; vertical-align: super; white-space: pre-wrap;">2</span><span style="background-color: white; font-family: "times new roman"; vertical-align: baseline; white-space: pre-wrap;">\C</span><span style="background-color: white; font-family: "times new roman"; font-size: 9.6px; vertical-align: super; white-space: pre-wrap;">2</span></span></div>
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<span style="font-family: "arial" , sans-serif;"> </span><a href="http://fisicaemconstrucaomeublog.blogspot.com.br/p/3-ano.html"><span style="color: #1155cc; font-family: "arial" , "sans-serif";">3º ano</span></a><span style="font-family: "times new roman" , "serif"; font-size: 14.0pt;"><o:p></o:p></span></div>
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Alex Fariashttp://www.blogger.com/profile/05866403100330572843noreply@blogger.com0tag:blogger.com,1999:blog-2260264792934765138.post-18186562464681277662016-02-25T13:44:00.001-03:002016-03-27T10:41:35.121-03:00Campo Elétrico <div style="text-align: right;">
Por: Alex Farias
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<table style="border-collapse: collapse; border: none;"><colgroup><col width="573"></col></colgroup><tbody>
<tr style="height: 0px;"><td style="border-bottom: solid #000000 3px; border-left: solid #000000 3px; border-right: solid #000000 3px; border-top: solid #000000 3px; padding: 7px 7px 7px 7px; vertical-align: top;"><div dir="ltr" style="line-height: 1.7999999999999998; margin-bottom: 0pt; margin-top: 0pt; text-align: justify;">
<span style="background-color: transparent; color: black; font-family: "times new roman"; font-size: 16px; font-style: normal; font-variant: normal; font-weight: 400; text-decoration: none; vertical-align: baseline; white-space: pre-wrap;">No estudo da gravitação universal, vimos que todo corpo massivo cria ao seu redor uma região de influência, ao qual denominamos de campo gravitacional. Assim ao colocarmos, outro corpo massivo nessa região existe uma interação, a qual chamamos de força gravitacional.</span></div>
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<span style="background-color: transparent; color: black; font-family: "times new roman"; font-size: 16px; font-style: normal; font-variant: normal; font-weight: 400; text-decoration: none; vertical-align: baseline; white-space: pre-wrap;">Podemos fazer, uma analogia, para o campo elétrico. Um objeto carregado eletricamente criará em suas proximidades uma região de influências, onde haverá interação elétrica a qual chamamos de campo elétrico.</span><br />
<span style="background-color: transparent; color: black; font-family: "times new roman"; font-size: 16px; font-style: normal; font-variant: normal; font-weight: 400; text-decoration: none; vertical-align: baseline; white-space: pre-wrap;"><br /></span>
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<a href="https://4.bp.blogspot.com/-MclaTzREL-k/Vulh_9utf2I/AAAAAAAABR8/4G6Ib5gaPHQT5qq8IHDUZ6OVYZDTSvn6w/s1600/alx.png" imageanchor="1" style="margin-left: 1em; margin-right: 1em;"><img border="0" height="183" src="https://4.bp.blogspot.com/-MclaTzREL-k/Vulh_9utf2I/AAAAAAAABR8/4G6Ib5gaPHQT5qq8IHDUZ6OVYZDTSvn6w/s320/alx.png" width="320" /></a></div>
<span style="background-color: transparent; color: black; font-family: "times new roman"; font-size: 16px; font-style: normal; font-variant: normal; font-weight: 400; text-decoration: none; vertical-align: baseline; white-space: pre-wrap;"><br /></span></div>
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<span style="background-color: transparent; color: black; font-family: "times new roman"; font-size: 16px; font-style: normal; font-variant: normal; font-weight: 400; text-decoration: none; vertical-align: baseline; white-space: pre-wrap;">O campo elétrico só será observado, quando colocarmos um corpo de prova nessa região e ele for afetado com interações elétricas.</span></div>
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<span style="background-color: transparent; color: black; font-family: "times new roman"; font-size: 16px; font-style: normal; font-variant: normal; font-weight: 400; text-decoration: none; vertical-align: baseline; white-space: pre-wrap;"> </span></div>
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<span style="background-color: transparent; color: black; font-family: "times new roman"; font-size: 16px; font-style: normal; font-variant: normal; font-weight: 400; text-decoration: none; vertical-align: baseline; white-space: pre-wrap;">Campo elétrico é um vetor e como tal possui um módulo, uma direção e o sentido. Para cargas positivas o campo elétrico tem sentido de afastamento, já para cargas negativas o sentido do campo é o de aproximação.</span></div>
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<span style="background-color: transparent; color: black; font-family: "times new roman"; font-size: 16px; font-style: normal; font-variant: normal; font-weight: 400; text-decoration: none; vertical-align: baseline; white-space: pre-wrap;"><img alt="alex.png" height="163" src="https://lh4.googleusercontent.com/m0x4637wU49b1xmjCi1FUQohG8rZzOiQb3oeMK8V42IwmRqGvhOv2v15Xl-d8Az6mqdCg314DPciRX0FFDBmyLiQUum1p7BY_be_1Yph0CzMVnLyzIKKMAYnV2RvT2nU-eEP5Med" style="border: none; transform: rotate(0rad);" width="320" /></span></div>
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<span style="background-color: transparent; color: black; font-family: "times new roman"; font-size: 16px; font-style: normal; font-variant: normal; font-weight: 400; text-decoration: none; vertical-align: baseline; white-space: pre-wrap;"> </span></div>
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<span style="background-color: transparent; color: black; font-family: "times new roman"; font-size: 16px; font-style: normal; font-variant: normal; font-weight: 400; text-decoration: none; vertical-align: baseline; white-space: pre-wrap;">A intensidade do campo elétrico é proporcional a força e inversamente proporcional a distância, podendo ser calculada utilizando a fórmula, a seguir: </span></div>
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<a href="https://lh6.googleusercontent.com/61G-irv_wN_zrHR94Ld46F8JOP_wY71RHZ8Q208cF7iyyXbKW3cM9MvOCmzzvpf_57zlS4UvHsjCbc_rezcZXWcJPqBYvIJQUTxt5b_sYReTxz6v-27AGSZjM4lNB8318zw9xAyr" imageanchor="1" style="margin-left: 1em; margin-right: 1em;"><img alt="E = \frac{F}{q}" border="0" height="43" src="https://lh6.googleusercontent.com/61G-irv_wN_zrHR94Ld46F8JOP_wY71RHZ8Q208cF7iyyXbKW3cM9MvOCmzzvpf_57zlS4UvHsjCbc_rezcZXWcJPqBYvIJQUTxt5b_sYReTxz6v-27AGSZjM4lNB8318zw9xAyr" style="border: none; transform: rotate(0rad);" width="65" /></a></div>
<span style="background-color: transparent; color: black; font-family: "times new roman"; font-size: 16px; font-style: normal; font-variant: normal; font-weight: 400; text-decoration: none; vertical-align: baseline; white-space: pre-wrap;">Assim, temos que a força elétrica é dada por: </span></div>
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<span style="background-color: white; color: black; font-family: "times new roman"; font-size: 16px; font-style: normal; font-variant: normal; font-weight: 400; text-decoration: none; vertical-align: baseline; white-space: pre-wrap;"> </span><span style="background-color: white; color: black; font-family: "times new roman"; font-size: 16px; font-style: normal; font-variant: normal; font-weight: 400; text-decoration: none; vertical-align: baseline; white-space: pre-wrap;"><img alt="F = \frac{k \cdot |q_1| \cdot |q_2|}{d^2}" height="56" src="https://lh5.googleusercontent.com/Xtov5a_dZhFfyOvPTWDYyeBJWEzLv8G7pDvJr8YWSm3M4rZyIr5BFJBC9vUuv3MioSBDnXoTfHOVOrbfnWrBh6KchhvN9l49y8FPDsaDEl-vpL7M5We1jmMo9bdHzMBe--QXdcEm" style="-webkit-transform: rotate(0.00rad); border: none; transform: rotate(0.00rad);" width="124" /></span><span style="background-color: white; color: black; font-family: "times new roman"; font-size: 16px; font-style: normal; font-variant: normal; font-weight: 400; text-decoration: none; vertical-align: baseline; white-space: pre-wrap;"> </span></div>
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<span style="background-color: white; font-family: "times new roman"; font-size: 16px; line-height: 22.08px; white-space: pre-wrap;">Substituindo o valor de F, na primeira equação, obtemos:</span></div>
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<img alt="E = k \frac{|q_2|}{d^2}" height="56" src="https://lh4.googleusercontent.com/3azFFoJPPKJdl39TpS3nMpXNcgELGoju-w_-y0UwHXf5dW3dR7MLePJLMNak8kH0ktQhqSeK9cUBpg3qqrHZd80lxra7B5daS0Drna6VoEKLK4ZLFlK-eZypbc6wWJFBcPeofnVS" style="border: none; font-family: 'times new roman'; font-size: 16px; line-height: 1.38; transform: rotate(0rad); white-space: pre-wrap;" width="91" /></div>
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<div dir="ltr" style="line-height: 1.38; margin-bottom: 12pt; margin-top: 0pt;">
<span style="background-color: white; color: black; font-family: "times new roman"; font-size: 16px; font-style: normal; font-variant: normal; font-weight: 400; text-decoration: none; vertical-align: baseline; white-space: pre-wrap;">No SI, o valor da constante eletrostática é: K = 9,0 . 10</span><span style="background-color: white; color: black; font-family: "times new roman"; font-size: 9.6px; font-style: normal; font-variant: normal; font-weight: 400; text-decoration: none; vertical-align: super; white-space: pre-wrap;">9</span><span style="background-color: white; color: black; font-family: "times new roman"; font-size: 16px; font-style: normal; font-variant: normal; font-weight: 400; text-decoration: none; vertical-align: baseline; white-space: pre-wrap;"> N.m</span><span style="background-color: white; color: black; font-family: "times new roman"; font-size: 9.6px; font-style: normal; font-variant: normal; font-weight: 400; text-decoration: none; vertical-align: super; white-space: pre-wrap;">2</span><span style="background-color: white; color: black; font-family: "times new roman"; font-size: 16px; font-style: normal; font-variant: normal; font-weight: 400; text-decoration: none; vertical-align: baseline; white-space: pre-wrap;">\C</span><span style="background-color: white; color: black; font-family: "times new roman"; font-size: 9.6px; font-style: normal; font-variant: normal; font-weight: 400; text-decoration: none; vertical-align: super; white-space: pre-wrap;">2</span></div>
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<iframe allowfullscreen="" frameborder="0" height="340" src="https://www.youtube.com/embed/XDJu_XVBQPo" width="540"></iframe>
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<a href="http://fisicaemconstrucaomeublog.blogspot.com.br/p/3-ano.html" style="text-decoration: none;"><span style="background-color: white; color: #1155cc; font-family: "arial"; font-size: 16px; font-style: normal; font-variant: normal; font-weight: 400; text-decoration: underline; vertical-align: baseline; white-space: pre-wrap;">3º ano</span></a></div>
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Alex Fariashttp://www.blogger.com/profile/05866403100330572843noreply@blogger.com0tag:blogger.com,1999:blog-2260264792934765138.post-14083070551405590182016-02-07T11:05:00.001-03:002016-03-27T10:37:56.139-03:00Lei de Coulomb <div style="text-align: right;">
Por: Alex Farias
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<table style="border-collapse: collapse; border: none;"><colgroup><col width="297"></col><col width="108"></col><col width="198"></col></colgroup><tbody>
<tr style="height: 0px;"><td style="border-bottom: solid #000000 3px; border-left: solid #000000 3px; border-right: solid #000000 3px; border-top: solid #000000 3px; padding: 7px 7px 7px 7px; vertical-align: top;"><div dir="ltr" style="line-height: 1.7999999999999998; margin-bottom: 0pt; margin-top: 0pt; text-align: justify;">
<span style="background-color: transparent; color: black; font-family: "times new roman"; font-size: 16px; font-style: normal; font-variant: normal; font-weight: 400; text-decoration: none; vertical-align: baseline; white-space: pre-wrap;">A interação entre cargas elétricas foi verificada, experimentalmente, pelo físico francês Charles August de Coulomb em 1873, através de seu famoso experimento: A balança de torção.</span></div>
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<span style="background-color: transparent; color: black; font-family: "times new roman"; font-size: 16px; font-style: normal; font-variant: normal; font-weight: 400; text-decoration: none; vertical-align: baseline; white-space: pre-wrap;"> </span></div>
<div dir="ltr" style="line-height: 1.7999999999999998; margin-bottom: 0pt; margin-top: 0pt; text-align: justify;">
<span style="background-color: transparent; color: black; font-family: "times new roman"; font-size: 16px; font-style: normal; font-variant: normal; font-weight: 400; text-decoration: none; vertical-align: baseline; white-space: pre-wrap;">Coulomb, utilizou a balança de torção para calcular a força elétrica entre cargas elétricas.</span></div>
</td><td colspan="2" style="border-bottom: solid #000000 3px; border-left: solid #000000 3px; border-right: solid #000000 3px; border-top: solid #000000 3px; padding: 7px 7px 7px 7px; vertical-align: top;"><div dir="ltr" style="line-height: 1.38; margin-bottom: 0pt; margin-top: 0pt; text-align: center;">
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<tr><td style="text-align: center;"><img alt="4074154957_8ce56f93d1.jpg" height="256" src="https://lh4.googleusercontent.com/jBhE7eBn3lWSPRaDaXJAA2eYzgtEfFhF-6JRSvLDLNvTG1quB_oykJAmzFuLa1tCtnyYnj_kM8vnIaQL-9Wpiqy-WIMkuBEE7pPfoBWZRSB7NEYeQa8pzkRmjmdFrfqU6BVyoCuF" style="border: none; margin-left: auto; margin-right: auto; transform: rotate(0rad);" width="257" /></td></tr>
<tr><td class="tr-caption" style="text-align: center;">Fonte: Nerdyard</td></tr>
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<span style="background-color: transparent; color: black; font-family: "arial"; font-size: 14.666666666666666px; font-style: normal; font-variant: normal; font-weight: 400; text-decoration: none; vertical-align: baseline; white-space: pre-wrap;"></span></div>
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<tr style="height: 0px;"><td colspan="3" style="border-bottom: solid #000000 3px; border-left: solid #000000 3px; border-right: solid #000000 3px; border-top: solid #000000 3px; padding: 7px 7px 7px 7px; vertical-align: top;"><div dir="ltr" style="line-height: 1.7999999999999998; margin-bottom: 0pt; margin-top: 0pt; text-align: justify;">
<span style="background-color: transparent; color: black; font-family: "times new roman"; font-size: 16px; font-style: normal; font-variant: normal; font-weight: 400; text-decoration: none; vertical-align: baseline; white-space: pre-wrap;">Após as observações, Charles concluiu que essa força pode ser calculada de forma análoga a força gravitacional. Sendo proporcional ao valor das cargas e inversamente proporcional ao quadrado da distância, que separa as separa, havendo também a necessidade de introduzirmos uma constante eletrostática, podendo ser calculada através da equação abaixo:</span></div>
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<tr style="height: 0px;"><td colspan="2" style="border-bottom: solid #000000 3px; border-left: solid #000000 3px; border-right: solid #000000 3px; border-top: solid #000000 3px; padding: 7px 7px 7px 7px; vertical-align: top;"><div dir="ltr" style="line-height: 1.7999999999999998; margin-bottom: 0pt; margin-top: 0pt; text-align: justify;">
<span style="background-color: transparent; color: black; font-family: "times new roman"; font-size: 16px; font-style: normal; font-variant: normal; font-weight: 400; text-decoration: none; vertical-align: baseline; white-space: pre-wrap;">F → Força elétrica (N)</span></div>
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<span style="background-color: transparent; color: black; font-family: "times new roman"; font-size: 16px; font-style: normal; font-variant: normal; font-weight: 400; text-decoration: none; vertical-align: baseline; white-space: pre-wrap;">K → Constante eletrostática N.m</span><span style="background-color: transparent; color: black; font-family: "times new roman"; font-size: 9.6px; font-style: normal; font-variant: normal; font-weight: 400; text-decoration: none; vertical-align: super; white-space: pre-wrap;">2</span><span style="background-color: transparent; color: black; font-family: "times new roman"; font-size: 16px; font-style: normal; font-variant: normal; font-weight: 400; text-decoration: none; vertical-align: baseline; white-space: pre-wrap;">/C</span><span style="background-color: transparent; color: black; font-family: "times new roman"; font-size: 9.6px; font-style: normal; font-variant: normal; font-weight: 400; text-decoration: none; vertical-align: super; white-space: pre-wrap;">2</span></div>
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<span style="background-color: transparent; color: black; font-family: "times new roman"; font-size: 16px; font-style: normal; font-variant: normal; font-weight: 400; text-decoration: none; vertical-align: baseline; white-space: pre-wrap;"> Q</span><span style="background-color: transparent; color: black; font-family: "times new roman"; font-size: 9.6px; font-style: normal; font-variant: normal; font-weight: 400; text-decoration: none; vertical-align: sub; white-space: pre-wrap;">1 </span><span style="background-color: transparent; color: black; font-family: "times new roman"; font-size: 16px; font-style: normal; font-variant: normal; font-weight: 400; text-decoration: none; vertical-align: baseline; white-space: pre-wrap;">e Q</span><span style="background-color: transparent; color: black; font-family: "times new roman"; font-size: 9.6px; font-style: normal; font-variant: normal; font-weight: 400; text-decoration: none; vertical-align: sub; white-space: pre-wrap;">2 </span><span style="background-color: transparent; color: black; font-family: "times new roman"; font-size: 16px; font-style: normal; font-variant: normal; font-weight: 400; text-decoration: none; vertical-align: baseline; white-space: pre-wrap;"> → Carga elétrica (C)</span></div>
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<span style="background-color: transparent; color: black; font-family: "times new roman"; font-size: 16px; font-style: normal; font-variant: normal; font-weight: 400; text-decoration: none; vertical-align: baseline; white-space: pre-wrap;">d → distância (m)</span></div>
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<span style="background-color: transparent; color: black; font-family: "times new roman"; font-size: 16px; font-style: normal; font-variant: normal; font-weight: 400; text-decoration: none; vertical-align: baseline; white-space: pre-wrap;"><img alt="aaaaa.jpg" height="224" src="https://lh3.googleusercontent.com/a5vIaOVVBB5lPymmg8XErGLS4fnBpLYW_wQWnh-8Ckf9Y3MEt1Nm0a01MC8BlQF5SASQGxT2eu1nkW9iTumBLk8re5ZUTvu7FuG9k4X_7QKRh_Ll4DfgR69UbL6OQ6MBM00Yrpy1" style="-webkit-transform: rotate(0.00rad); border: none; transform: rotate(0.00rad);" width="316" /></span></div>
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<span style="background-color: transparent; color: black; font-family: "times new roman"; font-size: 16px; font-style: normal; font-variant: normal; font-weight: 400; text-decoration: none; vertical-align: baseline; white-space: pre-wrap;"> </span></div>
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<span style="background-color: transparent; color: black; font-family: "times new roman"; font-size: 16px; font-style: normal; font-variant: normal; font-weight: 400; text-decoration: none; vertical-align: baseline; white-space: pre-wrap;"> </span><span style="background-color: transparent; color: black; font-family: "times new roman"; font-size: 16px; font-style: normal; font-variant: normal; font-weight: 400; text-decoration: none; vertical-align: baseline; white-space: pre-wrap;"><img alt="agafa.png" height="92" src="https://lh3.googleusercontent.com/DsYLOoUuWWi80y-U4xAzv4L2lmuuwAoL0lEdduhFMIzePxrnKMPzbLg6dbiJtiu8dc_izdhxqi8r-DVax1zhcH7BLREwBdXd6sPeNJBFTatYq0TWDcj0qTInKRTv0Wl0tdAgRQ-z" style="-webkit-transform: rotate(0.00rad); border: none; transform: rotate(0.00rad);" width="182" /></span></div>
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<tr style="height: 0px;"><td colspan="3" style="border-bottom: solid #000000 3px; border-left: solid #000000 3px; border-right: solid #000000 3px; border-top: solid #000000 3px; padding: 7px 7px 7px 7px; vertical-align: top;"><div dir="ltr" style="line-height: 1.38; margin-bottom: 0pt; margin-top: 0pt; text-align: justify;">
<span style="background-color: transparent; color: black; font-family: "times new roman"; font-size: 16px; font-style: normal; font-variant: normal; font-weight: 400; text-decoration: none; vertical-align: baseline; white-space: pre-wrap;">O valor da constante elétrica para cargas situadas no vácuo, é K</span><span style="background-color: transparent; color: black; font-family: "times new roman"; font-size: 9.6px; font-style: normal; font-variant: normal; font-weight: 400; text-decoration: none; vertical-align: sub; white-space: pre-wrap;">0 = </span><span style="background-color: transparent; color: black; font-family: "times new roman"; font-size: 16px; font-style: normal; font-variant: normal; font-weight: 400; text-decoration: none; vertical-align: baseline; white-space: pre-wrap;">9 . 10 </span><span style="background-color: transparent; color: black; font-family: "times new roman"; font-size: 9.6px; font-style: normal; font-variant: normal; font-weight: 400; text-decoration: none; vertical-align: super; white-space: pre-wrap;">9</span><span style="background-color: transparent; color: black; font-family: "times new roman"; font-size: 16px; font-style: normal; font-variant: normal; font-weight: 400; text-decoration: none; vertical-align: baseline; white-space: pre-wrap;">N.m</span><span style="background-color: transparent; color: black; font-family: "times new roman"; font-size: 9.6px; font-style: normal; font-variant: normal; font-weight: 400; text-decoration: none; vertical-align: super; white-space: pre-wrap;">2</span><span style="background-color: transparent; color: black; font-family: "times new roman"; font-size: 16px; font-style: normal; font-variant: normal; font-weight: 400; text-decoration: none; vertical-align: baseline; white-space: pre-wrap;">/C</span><span style="background-color: transparent; color: black; font-family: "times new roman"; font-size: 9.6px; font-style: normal; font-variant: normal; font-weight: 400; text-decoration: none; vertical-align: super; white-space: pre-wrap;">2</span></div>
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<a href="http://fisicaemconstrucaomeublog.blogspot.com.br/p/3-ano.html" style="text-decoration: none;"><span style="background-color: transparent; color: #1155cc; font-family: "arial"; font-size: 14.666666666666666px; font-style: normal; font-variant: normal; font-weight: 400; text-decoration: underline; vertical-align: baseline; white-space: pre-wrap;">3º ano</span></a></div>
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<br />Alex Fariashttp://www.blogger.com/profile/05866403100330572843noreply@blogger.com0tag:blogger.com,1999:blog-2260264792934765138.post-87920781881507777862016-02-03T10:45:00.001-03:002016-03-27T10:40:19.067-03:00Processos de eletrização<div style="text-align: right;">
Por:Alex Farias
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<table style="border-collapse: collapse; border: none; width: 602px;"><colgroup><col width="*"></col></colgroup><tbody>
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<iframe allowfullscreen="" height="300" scrolling="no" src="https://phet.colorado.edu/sims/html/balloons-and-static-electricity/latest/balloons-and-static-electricity_pt_BR.html" style="font-family: 'times new roman'; line-height: normal;" width="575"></iframe><span style="font-family: "times new roman"; line-height: normal;">
Fonte: Phet</span></div>
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<tr style="height: 0px;"><td style="border-bottom: solid #000000 3px; border-left: solid #000000 3px; border-right: solid #000000 3px; border-top: solid #000000 1px; padding: 7px 7px 7px 7px; vertical-align: top;"><div dir="ltr" style="line-height: 1.7999999999999998; margin-bottom: 0pt; margin-top: 0pt;">
<span style="background-color: transparent; color: black; font-family: "arial"; font-size: 14.666666666666666px; font-style: normal; font-variant: normal; font-weight: 400; text-decoration: none; vertical-align: baseline; white-space: pre-wrap;">Existem três formas pela qual um corpo inicialmente neutro, pode se tornar eletrizado.</span></div>
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<li dir="ltr" style="background-color: transparent; color: black; font-family: Arial; font-size: 14.666666666666666px; font-style: normal; font-variant: normal; font-weight: 400; list-style-type: disc; text-decoration: none; vertical-align: baseline;"><div dir="ltr" style="line-height: 1.7999999999999998; margin-bottom: 0pt; margin-top: 0pt;">
<span style="background-color: transparent; color: black; font-family: "arial"; font-size: 14.666666666666666px; font-style: normal; font-variant: normal; font-weight: 400; text-decoration: none; vertical-align: baseline; white-space: pre-wrap;">Atrito;</span></div>
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<span style="background-color: transparent; color: black; font-family: "arial"; font-size: 14.666666666666666px; font-style: normal; font-variant: normal; font-weight: 400; text-decoration: none; vertical-align: baseline; white-space: pre-wrap;">Contato;</span></div>
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<li dir="ltr" style="background-color: transparent; color: black; font-family: Arial; font-size: 14.666666666666666px; font-style: normal; font-variant: normal; font-weight: 400; list-style-type: disc; text-decoration: none; vertical-align: baseline;"><div dir="ltr" style="line-height: 1.7999999999999998; margin-bottom: 0pt; margin-top: 0pt;">
<span style="background-color: transparent; color: black; font-family: "arial"; font-size: 14.666666666666666px; font-style: normal; font-variant: normal; font-weight: 400; text-decoration: none; vertical-align: baseline; white-space: pre-wrap;">Indução;</span></div>
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<span style="background-color: transparent; color: black; font-family: "arial"; font-size: 14.666666666666666px; font-style: normal; font-variant: normal; font-weight: 700; text-decoration: none; vertical-align: baseline; white-space: pre-wrap;">A eletrização por atrito</span><span style="background-color: transparent; color: black; font-family: "arial"; font-size: 14.666666666666666px; font-style: normal; font-variant: normal; font-weight: 400; text-decoration: none; vertical-align: baseline; white-space: pre-wrap;"> acontece quando pegamos dois corpos inicialmente neutros e friccionamos um com o outro, o que faz com que eles fiquem eletrizados com cargas de mesmo valor absoluto, mas com sinais contrários. Isso ocorre por que com o atrito elétrons são arrancados de um do corpo, sendo integrados no outro corpo.</span><br />
<span style="background-color: transparent; color: black; font-family: "arial"; font-size: 14.666666666666666px; font-style: normal; font-variant: normal; font-weight: 400; text-decoration: none; vertical-align: baseline; white-space: pre-wrap;"><br /></span></div>
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<tr><td style="text-align: center;"><img height="143" src="https://lh5.googleusercontent.com/bsCwMzrRu0C1KxHDLz_uheHrbGDxk2uf8gsCQlU1gPjZl6b1ffNoTEuCRyojK873LXxEvOnxujUpu1_ecuHBFFMJPlI90GmCq-nC_64rH8L4DhxvsFQRs0Byg1li7ERHpoiQrZWy" style="border: none; margin-left: auto; margin-right: auto; transform: rotate(0rad);" width="352" /></td></tr>
<tr><td class="tr-caption" style="text-align: center;">Fonte : Cola da Web</td></tr>
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<span style="background-color: transparent; color: black; font-family: "arial"; font-size: 14.666666666666666px; font-style: normal; font-variant: normal; font-weight: 400; text-decoration: none; vertical-align: baseline; white-space: pre-wrap;"></span></div>
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<div dir="ltr" style="line-height: 1.7999999999999998; margin-bottom: 0pt; margin-top: 0pt; text-align: justify;">
<span style="background-color: transparent; color: black; font-family: "arial"; font-size: 14.666666666666666px; font-style: normal; font-variant: normal; font-weight: 400; text-decoration: none; vertical-align: baseline; white-space: pre-wrap;">A seda, por exemplo, tem maior afinidade por elétrons do que o vidro, dessa forma ao atritarmos o vidro e a seda, o vidro ficará positivo e a seda negativa. </span></div>
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<tr style="height: 0px;"><td style="border-bottom: solid #000000 3px; border-left: solid #000000 3px; border-right: solid #000000 3px; border-top: solid #000000 3px; padding: 7px 7px 7px 7px; vertical-align: top;"><div dir="ltr" style="line-height: 1.7999999999999998; margin-bottom: 0pt; margin-top: 0pt;">
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<span style="background-color: transparent; color: black; font-family: "arial"; font-size: 14.666666666666666px; font-style: normal; font-variant: normal; font-weight: 700; text-decoration: none; vertical-align: baseline; white-space: pre-wrap;">A eletrização por contato </span><span style="background-color: transparent; color: black; font-family: "arial"; font-size: 14.666666666666666px; font-style: normal; font-variant: normal; font-weight: 400; text-decoration: none; vertical-align: baseline; white-space: pre-wrap;">ocorre entre dois condutores elétricos, estando um inicialmente neutro, e outro carregado, nesse processo aproxima-se o condutor carregado até que os dois entrem em contato, após o contato há passagem de elétrons do corpo carregado para o corpo neutro, até que os dois estejam em equilíbrio eletrostático, ao final quando separamos os dois condutores, estes terão o mesmo tipo de carga, ou seja cargas de mesmo sinal.</span><br />
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<a href="https://3.bp.blogspot.com/-MK90DNfHr1I/VudfXfea_tI/AAAAAAAABRo/1YvEL7_8pfk3gFBoxNM-De42FKViuRmig/s1600/adfsdsd.png" imageanchor="1" style="margin-left: 1em; margin-right: 1em;"><img border="0" height="280" src="https://3.bp.blogspot.com/-MK90DNfHr1I/VudfXfea_tI/AAAAAAAABRo/1YvEL7_8pfk3gFBoxNM-De42FKViuRmig/s320/adfsdsd.png" width="320" /></a></div>
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<span style="background-color: transparent; color: black; font-family: "arial"; font-size: 14.666666666666666px; font-style: normal; font-variant: normal; font-weight: 400; text-decoration: none; vertical-align: baseline; white-space: pre-wrap;"></span></div>
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<tr style="height: 0px;"><td style="border-bottom: solid #000000 3px; border-left: solid #000000 3px; border-right: solid #000000 3px; border-top: solid #000000 3px; padding: 7px 7px 7px 7px; vertical-align: top;"><div dir="ltr" style="line-height: 1.7999999999999998; margin-bottom: 0pt; margin-top: 0pt; text-align: justify;">
<span style="background-color: transparent; color: black; font-family: "arial"; font-size: 14.666666666666666px; font-style: normal; font-variant: normal; font-weight: 400; text-decoration: none; vertical-align: baseline; white-space: pre-wrap;">O terceiro processo de eletrização é chamado de i</span><span style="background-color: transparent; color: black; font-family: "arial"; font-size: 14.666666666666666px; font-style: normal; font-variant: normal; font-weight: 700; text-decoration: none; vertical-align: baseline; white-space: pre-wrap;">ndução, </span><span style="background-color: transparent; color: black; font-family: "arial"; font-size: 14.666666666666666px; font-style: normal; font-variant: normal; font-weight: 400; text-decoration: none; vertical-align: baseline; white-space: pre-wrap;">acontece quando aproximamos um corpo eletrizado, de um segundo corpo inicialmente em seu equilíbrio eletrostático, e ocorre uma reorientação dos portadores de carga através da separação das cargas positivas e negativas no interior do corpo. </span></div>
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<tr><td style="text-align: center;"><img height="129" src="https://lh5.googleusercontent.com/jn50qM_emuU2CKADRUur7o3QYdoqO-Fb8yaDIdMylvAdXMbGNOBSP11yy5rsoYF28ta6bI5bCcineSUOknK8agavAUztZKaUxbupL73w509R4r3SGvGLffYacfBLk_pWLQ6Xvj6o" style="border: none; margin-left: auto; margin-right: auto; transform: rotate(0rad);" width="556" /></td></tr>
<tr><td class="tr-caption" style="text-align: center;">Fonte: Física e vestibular</td></tr>
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<span id="docs-internal-guid-3f1097a4-65fd-e400-6c30-500725279d7b"><span style="font-family: "arial"; font-size: 14.6667px; vertical-align: baseline; white-space: pre-wrap;"></span></span><span style="background-color: transparent; color: black; font-family: "arial"; font-size: 14.666666666666666px; font-style: normal; font-variant: normal; font-weight: 400; text-decoration: none; vertical-align: baseline; white-space: pre-wrap;"></span></div>
<div dir="ltr" style="line-height: 1.7999999999999998; margin-bottom: 0pt; margin-top: 0pt; text-align: justify;">
<span style="background-color: transparent; color: black; font-family: "arial"; font-size: 14.666666666666666px; font-style: normal; font-variant: normal; font-weight: 400; text-decoration: none; vertical-align: baseline; white-space: pre-wrap;">Quando aproximamos uma esfera carregada positivamente de uma segunda esfera neutra, haverá uma separação das cargas em seu interior, no entanto está ainda continua com o mesmo número de cargas positivas e negativas, e se tornará eletrizada após colocarmos um fio condutor ligado a terra. O que ocorre é que elétrons são conduzidos para a segunda esfera para neutralizar a parte negativa da esfera. Ao retirarmos o fio condutor a segunda esfera estará com mais cargas negativas, ou seja eletrizada negativamente.</span></div>
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<span style="background-color: transparent; color: black; font-family: "arial"; font-size: 14.666666666666666px; font-style: normal; font-variant: normal; font-weight: 400; text-decoration: none; vertical-align: baseline; white-space: pre-wrap;">Chamamos o corpo eletrizado inicialmente de </span><span style="background-color: transparent; color: black; font-family: "arial"; font-size: 14.666666666666666px; font-style: normal; font-variant: normal; font-weight: 700; text-decoration: none; vertical-align: baseline; white-space: pre-wrap;">indutor</span><span style="background-color: transparent; color: black; font-family: "arial"; font-size: 14.666666666666666px; font-style: normal; font-variant: normal; font-weight: 400; text-decoration: none; vertical-align: baseline; white-space: pre-wrap;"> e o segundo de </span><span style="background-color: transparent; color: black; font-family: "arial"; font-size: 14.666666666666666px; font-style: normal; font-variant: normal; font-weight: 700; text-decoration: none; vertical-align: baseline; white-space: pre-wrap;">induzido</span><span style="background-color: transparent; color: black; font-family: "arial"; font-size: 14.666666666666666px; font-style: normal; font-variant: normal; font-weight: 400; text-decoration: none; vertical-align: baseline; white-space: pre-wrap;">. </span></div>
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<span style="background-color: transparent; color: black; font-family: "arial"; font-size: 14.666666666666666px; font-style: normal; font-variant: normal; font-weight: 400; text-decoration: none; vertical-align: baseline; white-space: pre-wrap;"><a href="http://fisicaemconstrucaomeublog.blogspot.com.br/p/3-ano.html"><img height="40" src="https://lh5.googleusercontent.com/mfOpIAnKzOrrZjc8lhvGT3IsGkzyPa9IOkhYdBbLep3lr5p34AF-mAKKBCmKt6HA1ygi1X7fWYJArQJiMryGTdZ-avD0f62kvlpX9-7xVYhGsxBe-RR_LRJGp2IO3i0W3hKzIICc" style="border: none; transform: rotate(0rad);" width="60" /></a></span></div>
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Alex Fariashttp://www.blogger.com/profile/05866403100330572843noreply@blogger.com0tag:blogger.com,1999:blog-2260264792934765138.post-90078486574582971392016-02-03T10:21:00.004-03:002016-03-27T10:42:51.409-03:00Condutores e isolantes<div style="text-align: right;">
Por: Alex Farias
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<span style="font-family: "arial"; font-size: 14.6667px; vertical-align: baseline; white-space: pre-wrap;">Na natureza encontramos materiais com diferentes propriedades, os quais podem ser classificados de acordo com suas características, considerando o estudo da eletricidade, encontramos os que não oferecem dificuldade a passagem da carga elétrica e os que oferecem resistência a ela sendo classificados em </span><span style="font-family: "arial"; font-size: 14.6667px; font-weight: 700; vertical-align: baseline; white-space: pre-wrap;">condutores e isolantes</span><span style="font-family: "arial"; font-size: 14.6667px; vertical-align: baseline; white-space: pre-wrap;">.</span></div>
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<span style="font-family: "arial"; font-size: 14.6667px; font-weight: 700; vertical-align: baseline; white-space: pre-wrap;">Condutores elétricos:</span> <span style="font-family: "arial"; font-size: 14.6667px; line-height: 1.8; white-space: pre-wrap;">Possuem grande quantidade de portadores de carga elétrica facilmente movimentáveis.</span></div>
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<span style="font-size: 14.6667px; vertical-align: baseline; white-space: pre-wrap;">elétrons livres</span></div>
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<span style="font-size: 14.6667px; vertical-align: baseline; white-space: pre-wrap;">íons positivos e negativos</span></div>
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<span style="font-size: 14.6667px; vertical-align: baseline; white-space: pre-wrap;">íons e elétrons livres </span></div>
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<span style="font-family: "arial"; font-size: 14.6667px; font-weight: 700; vertical-align: baseline; white-space: pre-wrap;">Isolantes elétricos:</span><span style="font-family: "arial"; font-size: 14.6667px; vertical-align: baseline; white-space: pre-wrap;"> Não possuem quantidade significativa de portadores de carga elétrica, que se movimentam facilmente: </span><span style="font-family: "arial"; font-size: 14.6667px; line-height: 1.8; white-space: pre-wrap;">vidro, plásticos, mica, porcelana, seda, são alguns exemplos de materiais isolantes</span><br />
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<iframe allowfullscreen="" height="500" scrolling="no" src="https://phet.colorado.edu/sims/html/john-travoltage/latest/john-travoltage_en.html" style="font-family: 'times new roman'; line-height: normal;" width="500"></iframe><br />
<span style="font-family: "arial"; font-size: 14.6667px; line-height: 26.4001px; white-space: pre-wrap;">Fonte Simulação: Phet</span><br />
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<span style="font-family: "arial"; font-size: 14.6667px; line-height: 26.4001px; white-space: pre-wrap;"><a href="http://fisicaemconstrucaomeublog.blogspot.com.br/p/3-ano.html" style="font-family: 'Times New Roman'; font-size: medium; line-height: normal; text-align: justify; white-space: normal;"><img alt="Resultado de imagem para imagens para voltar" src="https://encrypted-tbn3.gstatic.com/images?q=tbn:ANd9GcQrV2u4hFsH3jMoj1BUrwZBaIr0MiZltA8J6AEEDuqHYnV2aNGT" /></a></span></div>
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Alex Fariashttp://www.blogger.com/profile/05866403100330572843noreply@blogger.com0tag:blogger.com,1999:blog-2260264792934765138.post-22749758855407365682016-02-03T10:03:00.000-03:002016-03-25T09:47:00.178-03:00Princípio da atração e repulsão<div dir="ltr" style="margin-left: 13.5pt;">
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<span style="background-color: white; color: #5c5c5c; font-family: "arial"; font-size: 18px; font-style: normal; font-variant: normal; font-weight: 700; text-decoration: none; vertical-align: baseline; white-space: pre-wrap;"> </span><span style="font-family: arial; font-size: 14.6667px; line-height: 21.12px; text-align: right; white-space: pre-wrap;">Por: Alex Farias</span></h3>
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<span style="font-family: arial; font-size: 14.6667px; line-height: 1.44; white-space: pre-wrap;">A partir da observação de experimentos práticos, é possível verificar que:</span></div>
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<span style="background-color: transparent; color: black; font-family: "arial"; font-size: 14.666666666666666px; font-style: normal; font-variant: normal; font-weight: 400; text-decoration: none; vertical-align: baseline; white-space: pre-wrap;">Corpos eletrizados com cargas do mesmo tipo, tendem a se afastar:</span></div>
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<span style="background-color: transparent; color: black; font-family: "arial"; font-size: 14.666666666666666px; font-style: normal; font-variant: normal; font-weight: 400; text-decoration: none; vertical-align: baseline; white-space: pre-wrap;"><img height="189" src="https://lh3.googleusercontent.com/6s3o7Y8kc3m32t7kBgz4ZpfSQVqoks_j-HnON6Q9kqZN3V73QfgOcZK5zlwH_3shQpTpU3wHW30omBb_QbJyvDgL974-p7VeGl_7ANl85aUv1e2WStEBmt7fByGkhcOnHvzM3vgH" style="-webkit-transform: rotate(0.00rad); border: none; transform: rotate(0.00rad);" width="252" /></span></div>
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<div dir="ltr" style="line-height: 1.44; margin-bottom: 0pt; margin-top: 0pt;">
<span style="background-color: transparent; color: black; font-family: "arial"; font-size: 14.666666666666666px; font-style: normal; font-variant: normal; font-weight: 400; text-decoration: none; vertical-align: baseline; white-space: pre-wrap;">Corpos eletrizados com cargas de sinais contrários se atraem.</span></div>
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<span style="background-color: transparent; color: black; font-family: "arial"; font-size: 14.666666666666666px; font-style: normal; font-variant: normal; font-weight: 400; text-decoration: none; vertical-align: baseline; white-space: pre-wrap;">Esse princípio e suas consequências só pode ser observado experimentalmente, apresentando-se, conforme o diagrama abaixo :</span></div>
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<span style="background-color: transparent; color: black; font-family: "arial"; font-size: 14.666666666666666px; font-style: normal; font-variant: normal; font-weight: 400; text-decoration: none; vertical-align: baseline; white-space: pre-wrap;"><img height="355" src="https://lh5.googleusercontent.com/wt2XQXWGPc8iciJKjwwHkrEqbcBgi34PyOFbiamwq8ErtVzD44I6HriznNjmFPZKReiOBcvoJjkns_Qz2fsGSV_QKZ_qXwdsAsxh9hPD0QQQCnGLh_wo91fKO5GY9gkPIKDBv9FM" style="border: none; transform: rotate(0rad);" width="427" /></span><br />
<span style="background-color: transparent; color: black; font-family: "arial"; font-size: 14.666666666666666px; font-style: normal; font-variant: normal; font-weight: 400; text-decoration: none; vertical-align: baseline; white-space: pre-wrap;"><br /></span>
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<span style="background-color: transparent; color: black; font-family: "arial"; font-size: 14.666666666666666px; font-style: normal; font-variant: normal; font-weight: 400; text-decoration: none; vertical-align: baseline; white-space: pre-wrap;"><a href="http://fisicaemconstrucaomeublog.blogspot.com.br/p/3-ano.html">3º ano</a></span></div>
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Alex Fariashttp://www.blogger.com/profile/05866403100330572843noreply@blogger.com0tag:blogger.com,1999:blog-2260264792934765138.post-6940240374111653532016-02-01T20:53:00.000-03:002016-03-27T10:39:15.563-03:00Cargas Elétricas<div align="justify" class="titulo" style="background-color: white; margin-bottom: 8px; margin-top: 8px;">
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<span id="docs-internal-guid-cdc32782-6067-7121-68a1-405c9732870e"><br /></span>
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<span style="font-family: times new roman;"><span style="white-space: pre-wrap;"><b>Por: Alex Farias</b></span></span></div>
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<span style="background-color: transparent; color: black; font-family: "times new roman"; font-size: 16px; font-style: normal; font-variant: normal; font-weight: 400; text-decoration: none; vertical-align: baseline; white-space: pre-wrap;">A eletricidade estuda os todos os fenômenos relacionados com as propriedades da carga elétrica.</span></div>
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<span style="background-color: transparent; color: black; font-family: "times new roman"; font-size: 16px; font-style: normal; font-variant: normal; font-weight: 400; text-decoration: none; vertical-align: baseline; white-space: pre-wrap;">Seu estudo costuma ser dividido em:</span></div>
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<span style="background-color: transparent; color: black; font-family: "times new roman"; font-size: 16px; font-style: normal; font-variant: normal; font-weight: 400; text-decoration: none; vertical-align: baseline; white-space: pre-wrap;"> </span></div>
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<span style="background-color: transparent; color: black; font-family: "times new roman"; font-size: 16px; font-style: normal; font-variant: normal; font-weight: 400; text-decoration: none; vertical-align: baseline; white-space: pre-wrap;">Eletrostática;</span></div>
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<span style="background-color: transparent; color: black; font-family: "times new roman"; font-size: 16px; font-style: normal; font-variant: normal; font-weight: 400; text-decoration: none; vertical-align: baseline; white-space: pre-wrap;">Eletrodinâmica;</span></div>
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<div style="text-align: justify;">
<span style="background-color: transparent; color: black; font-family: "times new roman"; font-size: 16px; font-style: normal; font-variant: normal; font-weight: 400; text-decoration: none; vertical-align: baseline; white-space: pre-wrap;">Eletromagnetismo.</span></div>
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<span style="background-color: transparent; color: black; font-family: "times new roman"; font-size: 16px; font-style: normal; font-variant: normal; font-weight: 400; text-decoration: none; vertical-align: baseline; white-space: pre-wrap;"> </span></div>
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<tr style="height: 0px;"><td style="border-bottom: solid #000000 3px; border-left: solid #000000 3px; border-right: solid #000000 3px; border-top: solid #000000 1px; padding: 7px 7px 7px 7px; vertical-align: top;"><div dir="ltr" style="line-height: 1.38; margin-bottom: 0pt; margin-top: 0pt;">
<div style="text-align: justify;">
<span style="background-color: transparent; color: black; font-family: "times new roman"; font-size: 16px; font-style: normal; font-variant: normal; font-weight: 700; text-decoration: none; vertical-align: baseline; white-space: pre-wrap;">Carga elétrica</span></div>
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<span style="background-color: transparent; color: black; font-family: "times new roman"; font-size: 16px; font-style: normal; font-variant: normal; font-weight: 400; text-decoration: none; vertical-align: baseline; white-space: pre-wrap;"> </span></div>
</div>
<div dir="ltr" style="line-height: 1.38; margin-bottom: 0pt; margin-top: 0pt; text-align: justify;">
<span style="background-color: transparent; color: black; font-family: "times new roman"; font-size: 16px; font-style: normal; font-variant: normal; font-weight: 400; text-decoration: none; vertical-align: baseline; white-space: pre-wrap;">É uma propriedade fundamental da matéria. Como sabemos, a matéria é formada por átomos, que são formados por partículas ainda menores, dentre elas, para efeitos didáticos nos interessam especialmente, os prótons, elétrons e os nêutrons.</span></div>
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<span style="background-color: transparent; color: black; font-family: "times new roman"; font-size: 16px; font-style: normal; font-variant: normal; font-weight: 400; text-decoration: none; vertical-align: baseline; white-space: pre-wrap;"><br /></span>
<br />
<table align="center" cellpadding="0" cellspacing="0" class="tr-caption-container" style="margin-left: auto; margin-right: auto; text-align: center;"><tbody>
<tr><td style="text-align: center;"><img src="https://emilms.fema.gov/IS3/FEMA_IS/is03/assets/REM02-02-030.gif" style="margin-left: auto; margin-right: auto;" /></td></tr>
<tr><td class="tr-caption" style="font-size: 12.8px;">Fonte: Protons and Neutrons</td></tr>
</tbody></table>
<span style="background-color: transparent; color: black; font-family: "times new roman"; font-size: 16px; font-style: normal; font-variant: normal; font-weight: 400; text-decoration: none; vertical-align: baseline; white-space: pre-wrap;"> </span><span style="background-color: transparent; color: black; font-family: "times new roman"; font-size: 16px; font-style: normal; font-variant: normal; font-weight: 400; text-decoration: none; vertical-align: baseline; white-space: pre-wrap;"></span></div>
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<span style="background-color: transparent; font-family: "times new roman"; font-size: 16px; line-height: 1.38; white-space: pre-wrap;">Entre essas partículas pode haver força de atração ou repulsão, oque nos leva a conclusão que existem dois tipos de carga elétrica, denominadas, por convenção: positiva e negativa.</span></div>
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<div style="text-align: justify;">
<br /></div>
<div dir="ltr" style="line-height: 1.38; margin-bottom: 0pt; margin-top: 0pt;">
<div style="text-align: justify;">
<span style="background-color: transparent; color: black; font-family: "times new roman"; font-size: 16px; font-style: normal; font-variant: normal; font-weight: 400; text-decoration: none; vertical-align: baseline; white-space: pre-wrap;">Consideramos que:</span><br />
<br /></div>
</div>
<div dir="ltr" style="line-height: 1.38; margin-bottom: 0pt; margin-top: 0pt;">
<div style="text-align: justify;">
<span style="background-color: transparent; color: black; font-family: "times new roman"; font-size: 16px; font-style: normal; font-variant: normal; font-weight: 400; text-decoration: none; vertical-align: baseline; white-space: pre-wrap;">Os prótons possuem carga elétrica positiva </span><span style="background-color: transparent; color: black; font-family: "times new roman"; font-size: 16px; font-style: normal; font-variant: normal; font-weight: 400; text-decoration: none; vertical-align: baseline; white-space: pre-wrap;"> </span></div>
</div>
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<div style="text-align: justify;">
<span style="background-color: transparent; color: black; font-family: "times new roman"; font-size: 16px; font-style: normal; font-variant: normal; font-weight: 400; text-decoration: none; vertical-align: baseline; white-space: pre-wrap;"><br /></span>
<span style="background-color: transparent; color: black; font-family: "times new roman"; font-size: 16px; font-style: normal; font-variant: normal; font-weight: 400; text-decoration: none; vertical-align: baseline; white-space: pre-wrap;">Os elétrons cargas elétricas negativas </span></div>
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<div style="text-align: justify;">
<br /></div>
<div dir="ltr" style="line-height: 1.38; margin-bottom: 0pt; margin-top: 0pt;">
<div style="text-align: justify;">
<span style="background-color: transparent; color: black; font-family: "times new roman"; font-size: 16px; font-style: normal; font-variant: normal; font-weight: 400; text-decoration: none; vertical-align: baseline; white-space: pre-wrap;">Já os nêutrons não possuem carga elétrica.</span><br />
<table align="center" cellpadding="0" cellspacing="0" class="tr-caption-container" style="margin-left: auto; margin-right: auto; text-align: center;"><tbody>
<tr><td style="text-align: center;"><img alt="Resultado de imagem para protons" src="https://encrypted-tbn2.gstatic.com/images?q=tbn:ANd9GcTFCXRp-LdwpYalwOGwm50saLH4KLCctKuwSWfqDlRMWBfsmb2_gQ" style="margin-left: auto; margin-right: auto;" /></td></tr>
<tr><td class="tr-caption" style="text-align: center;">Fonte: Pic</td></tr>
</tbody></table>
<div style="text-align: center;">
<span style="background-color: transparent; color: black; font-family: "times new roman"; font-size: 16px; font-style: normal; font-variant: normal; font-weight: 400; text-decoration: none; vertical-align: baseline; white-space: pre-wrap;"></span></div>
<span style="background-color: transparent; color: black; font-family: "times new roman"; font-size: 16px; line-height: 1.38; vertical-align: baseline; white-space: pre-wrap;">No SI (Sistema Internacional de Unidades) a unidade para carga elétrica é o Coulomb, cujo símbolo é o </span><span style="background-color: transparent; color: black; font-family: "times new roman"; font-size: 16px; font-weight: 700; line-height: 1.38; vertical-align: baseline; white-space: pre-wrap;">C</span><span style="background-color: transparent; color: black; font-family: "times new roman"; font-size: 16px; line-height: 1.38; vertical-align: baseline; white-space: pre-wrap;">.</span></div>
</div>
<div style="text-align: justify;">
<br /></div>
<div dir="ltr" style="line-height: 1.38; margin-bottom: 0pt; margin-top: 0pt;">
<div style="text-align: justify;">
<span style="background-color: transparent; color: black; font-family: "times new roman"; font-size: 16px; font-style: normal; font-variant: normal; font-weight: 400; text-decoration: none; vertical-align: baseline; white-space: pre-wrap;">Sempre a carga elétrica, aparece na natureza como múltiplos inteiros de uma pequena carga elementar, representada pela letra </span><span style="background-color: transparent; color: black; font-family: "times new roman"; font-size: 16px; font-style: normal; font-variant: normal; font-weight: 700; text-decoration: none; vertical-align: baseline; white-space: pre-wrap;">e, </span><span style="background-color: transparent; color: black; font-family: "times new roman"; font-size: 16px; font-style: normal; font-variant: normal; font-weight: 400; text-decoration: none; vertical-align: baseline; white-space: pre-wrap;">sendo seu valor: </span></div>
</div>
<div style="text-align: center;">
<br /></div>
<div dir="ltr" style="line-height: 1.38; margin-bottom: 0pt; margin-top: 0pt;">
<div style="text-align: center;">
<span style="background-color: transparent; color: black; font-family: "times new roman"; font-size: 16px; font-style: normal; font-variant: normal; font-weight: 700; text-decoration: none; vertical-align: baseline; white-space: pre-wrap;">e = 1,6 . 10 </span><span style="background-color: transparent; color: black; font-family: "times new roman"; font-size: 9.6px; font-style: normal; font-variant: normal; font-weight: 700; text-decoration: none; vertical-align: super; white-space: pre-wrap;">-19 </span><span style="background-color: transparent; color: black; font-family: "times new roman"; font-size: 16px; font-style: normal; font-variant: normal; font-weight: 700; text-decoration: none; vertical-align: baseline; white-space: pre-wrap;">C.</span></div>
</div>
<div style="text-align: justify;">
<br /></div>
<div dir="ltr" style="line-height: 1.38; margin-bottom: 0pt; margin-top: 0pt;">
<div style="text-align: justify;">
<span style="background-color: transparent; color: black; font-family: "times new roman"; font-size: 16px; font-style: normal; font-variant: normal; font-weight: 700; text-decoration: none; vertical-align: baseline; white-space: pre-wrap;"> </span><span style="background-color: transparent; color: black; font-family: "times new roman"; font-size: 16px; font-style: normal; font-variant: normal; font-weight: 400; text-decoration: none; vertical-align: baseline; white-space: pre-wrap;">Consideramos a carga elétrica do próton, sendo: q</span><span style="background-color: transparent; color: black; font-family: "times new roman"; font-size: 9.6px; font-style: normal; font-variant: normal; font-weight: 400; text-decoration: none; vertical-align: sub; white-space: pre-wrap;">próton</span><span style="background-color: transparent; color: black; font-family: "times new roman"; font-size: 16px; font-style: normal; font-variant: normal; font-weight: 400; text-decoration: none; vertical-align: baseline; white-space: pre-wrap;"> = + 1,6 . 10 </span><span style="background-color: transparent; color: black; font-family: "times new roman"; font-size: 9.6px; font-style: normal; font-variant: normal; font-weight: 400; text-decoration: none; vertical-align: super; white-space: pre-wrap;">-19 </span><span style="background-color: transparent; color: black; font-family: "times new roman"; font-size: 16px; font-style: normal; font-variant: normal; font-weight: 400; text-decoration: none; vertical-align: baseline; white-space: pre-wrap;">C</span></div>
</div>
<div style="text-align: justify;">
<br /></div>
<div dir="ltr" style="line-height: 1.38; margin-bottom: 0pt; margin-top: 0pt;">
<div style="text-align: justify;">
<span style="background-color: transparent; color: black; font-family: "times new roman"; font-size: 16px; font-style: normal; font-variant: normal; font-weight: 400; text-decoration: none; vertical-align: baseline; white-space: pre-wrap;"> Consideramos a carga elétrica do elétron, sendo: e</span><span style="background-color: transparent; color: black; font-family: "times new roman"; font-size: 9.6px; font-style: normal; font-variant: normal; font-weight: 400; text-decoration: none; vertical-align: sub; white-space: pre-wrap;">elétron</span><span style="background-color: transparent; color: black; font-family: "times new roman"; font-size: 16px; font-style: normal; font-variant: normal; font-weight: 400; text-decoration: none; vertical-align: baseline; white-space: pre-wrap;">, = - 1,6 . 10 </span><span style="background-color: transparent; color: black; font-family: "times new roman"; font-size: 9.6px; font-style: normal; font-variant: normal; font-weight: 400; text-decoration: none; vertical-align: super; white-space: pre-wrap;">-19 </span><span style="background-color: transparent; color: black; font-family: "times new roman"; font-size: 16px; font-style: normal; font-variant: normal; font-weight: 400; text-decoration: none; vertical-align: baseline; white-space: pre-wrap;">C</span><br />
<span style="background-color: transparent; color: black; font-family: "times new roman"; font-size: 16px; font-style: normal; font-variant: normal; font-weight: 400; text-decoration: none; vertical-align: baseline; white-space: pre-wrap;"><br /></span>
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<span style="background-color: transparent; color: black; font-family: "times new roman"; font-size: 16px; font-style: normal; font-variant: normal; font-weight: 400; text-decoration: none; vertical-align: baseline; white-space: pre-wrap;"><a href="http://fisicaemconstrucaomeublog.blogspot.com.br/p/3-ano.html" style="font-family: arial, helvetica, sans-serif; font-size: medium; line-height: normal; text-align: center; white-space: normal;"><img alt="Resultado de imagem para imagens para voltar" src="https://encrypted-tbn3.gstatic.com/images?q=tbn:ANd9GcQrV2u4hFsH3jMoj1BUrwZBaIr0MiZltA8J6AEEDuqHYnV2aNGT" /></a></span></div>
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Alex Fariashttp://www.blogger.com/profile/05866403100330572843noreply@blogger.com0tag:blogger.com,1999:blog-2260264792934765138.post-48989305957351366042016-01-31T22:10:00.002-03:002016-02-03T10:10:11.021-03:00Introdução a Eletricidade<div align="justify" style="background-color: white;">
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Foi
descoberta por um filosofo grego chamado <a href="https://guilenematos.files.wordpress.com/2009/03/tales-de-mileto.pdf" target="_blank">Tales de Mileto</a> que, ao esfregar um
âmbar a um pedaço de pele de carneiro, observou que pedaços de palhas e
fragmentos de madeira começaram a ser atraídas pelo próprio âmbar.<br />
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<o:p></o:p></div>
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Do
âmbar (gr. élektron) surgiu o nome eletricidade. No século XVII foram iniciados
estudos sistemáticos sobre a eletrificação por atrito, graças a <a href="https://pt.wikipedia.org/w/index.php?title=Otto_von_Guericke&printable=yes" target="_blank">Otto vonGuericke</a>. Em 1672, Otto inventa uma maquina geradora de cargas elétricas onde
uma esfera de enxofre gira constantemente atritando-se em terra seca. Meio
século depois, <a href="https://pt.wikipedia.org/w/index.php?title=Stephen_Gray&printable=yes" target="_blank">Stephen Gray</a> faz a primeira distinção entre condutores e
isolantes elétricos.<o:p></o:p></div>
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<a href="http://4.bp.blogspot.com/-vmnzaQw3oA4/Vq_aGFABkVI/AAAAAAAABIE/PVxj9ICUEZg/s1600/300px-Lightning3.jpg" imageanchor="1" style="margin-left: 1em; margin-right: 1em;"><img border="0" src="http://4.bp.blogspot.com/-vmnzaQw3oA4/Vq_aGFABkVI/AAAAAAAABIE/PVxj9ICUEZg/s1600/300px-Lightning3.jpg" /></a></div>
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Durante
o século XVIII as maquinas elétricas evoluem até chegar a um disco rotativo de
vidro que é atritado a um isolante adequado. Uma descoberta importante foi o
condensador, descoberto independentemente por Ewald Georg von Kleist e por
Petrus van Musschenbroek. O condensador consistia em uma maquina armazenadora
de cargas elétricas. Eram dois corpos condutores separados por um isolante
delgado.<o:p></o:p></div>
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Mas
uma invenção importante, de uso pratico foi o pára-raios, feito por <a href="https://pt.wikipedia.org/w/index.php?title=Benjamin_Franklin&printable=yes" target="_blank">BenjaminFranklin</a>. Ele disse que a eletrização de dois corpos atritados era a falta de
um dos dois tipos de eletricidade em um dos corpos. esses dois tipos de
eletricidade eram chamadas de eletricidade resinosa e vítrea.<o:p></o:p></div>
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No
século XVIII foi feita a famosa experiência de Luigi Aloisio Galvani em que
potenciais elétricos produziam contrações na perna de uma rã morta. Essa
diferença foi atribuída por Alessandro Volta ao fazer contato entre dois metais
a perna de uma outra rã morta. Essa experiência foi atribuída a sua invenção
chamada de pilha voltaica. Ela consistia em um serie de discos de cobre e zinco
alterados, separados por pedaços de papelão embebidos por água salgada.<o:p></o:p></div>
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Com
essa invenção, obteve-se pela primeira vez uma fonte de corrente elétrica
estável. Por isso, as investigações sobre a corrente elétrica aumentaram cada
vez mais.<o:p></o:p></div>
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Depois
de um tempo, são feitas as experiências de decomposição da água. Em 1802,
Humphry Davy separa eletronicamente o sódio e potássio.<o:p></o:p></div>
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Mesmo
com a fama das pilhas de Volta, foram criadas pilhas mais eficientes. John
Frederic Daniell inventou-as em 1836 na mesma época das pilhas de Georges
Leclanché e a bateria recarregável de Raymond-Louis-Gaston Planté.<o:p></o:p></div>
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O
físico Hans Christian Örsted observa que um fio de corrente elétrica age sobre
a agulha de uma bússola. Com isso, percebe-se que há uma ligação entre
magnetismo e eletricidade.<o:p></o:p></div>
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Em
1831, Michael Faraday descobre que a variação na intensidade da corrente
elétrica que percorre um circuito fechado induz uma corrente em uma bobina
próxima. Uma corrente induzida também é observada ao se introduzir um ímã nessa
bobina. Essa indução magnética teve uma imediata aplicação na geração de
correntes elétricas. Uma bobina próxima a um ima que gira é um exemplo de um
gerador de corrente elétrica alternada.<o:p></o:p></div>
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Os
geradores foram se aperfeiçoando até se tornarem as principais fontes de
suprimento de eletricidade empregada principalmente na iluminação.<o:p></o:p></div>
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Em
1875 é instalado um gerador em Gare du Nord, Paris, para ligar as lâmpadas de
arco da estação. Foram feitas maquinas a vapor para movimentar os geradores, e
estimulando a invenção de turbinas a vapor e turbinas para utilização de
energia hidrelétrica. A primeira hidrelétrica foi instalada em 1886 junto as
cataratas do Niágara.<o:p></o:p></div>
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Para
ocorrer a distribuição de energia, foram criados inicialmente condutores de
ferro, depois os de cobre e finalmente, em 1850, já se fabricavam os fios
cobertos por uma camada isolante de guta-percha vulcanizada, ou uma camada de
pano.<o:p></o:p></div>
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A
Publicação do tratado sobre eletricidade e magnetismo, de <a href="https://pt.wikipedia.org/w/index.php?title=James_Clerk_Maxwell&printable=yes" target="_blank">James Clerk Maxwell</a>,
em 1873, representa um enorme avanço no estudo do eletromagnetismo. A luz passa
a ser estendida como onda eletromagnética, uma onde que consiste de campos
elétricos e magnéticos perpendiculares à direção de sua propagação.<o:p></o:p></div>
<div style="background-attachment: initial; background-clip: initial; background-image: initial; background-origin: initial; background-position: initial; background-repeat: initial; background-size: initial; margin: 0cm 0cm 0.0001pt; text-align: justify;">
<br /></div>
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<a href="https://pt.wikipedia.org/w/index.php?title=Heinrich_Hertz&printable=yes" target="_blank">HeinrichHertz</a>, em suas experiências realizadas a partir de 1885, estuda as propriedades
das onde eletromagnéticas geradas por uma bobina de indução; nessas
experiências observa que se refletidas, refratadas e polarizada, do mesmo modo
que a luz. Com o trabalho de Hertz fica demostrado que as ondas de radio e as
de luz são ambas ondas eletromagnéticas, desse modo confirmando as teorias de
Maxwell; as ondas de radio e as ondas luminosas diferem apenas na sua
freqüência.<o:p></o:p></div>
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<br /></div>
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Hertz
não explorou as possibilidades práticas abertas por suas experiências; mais de
dez anos se passa, até Guglielmo Marconi utilizar as ondas de radio no seu
telegrafo sem fio. A primeira mensagem de radio é transmitida através do
Atlântico em 1901. Todas essas experiências vieram abrir novos caminhos para a
progressiva utilização dos fenômenos elétrico sem praticamente todas as
atividades do homem.<o:p></o:p></div>
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Fonte:http://www.mundociencia.com.br/fisica/eletricidade/historiaeletricidade.htm<br />
<br />
<a href="http://fisicaemconstrucaomeublog.blogspot.com.br/p/3-ano.html"><img alt="Resultado de imagem para imagens para voltar" src="https://encrypted-tbn3.gstatic.com/images?q=tbn:ANd9GcQrV2u4hFsH3jMoj1BUrwZBaIr0MiZltA8J6AEEDuqHYnV2aNGT" /></a> <br />
<br />
<br />
<o:p></o:p></div>
</div>
Alex Fariashttp://www.blogger.com/profile/05866403100330572843noreply@blogger.com1tag:blogger.com,1999:blog-2260264792934765138.post-73612121261567879912015-11-16T10:04:00.001-03:002016-02-03T10:12:25.843-03:00Potência elétrica<div class="MsoNormal">
Potência elétrica é uma grandeza física que aparece em
várias questões do vestibular, logo, é um assunto que deve ser estudado com
muita atenção. Para utilizar da forma correta as equações de potência elétrica
é importante entender o conceito de potencia que vimos em um dos textos
anteriores, só para lembrar: Na física, potência pode ser definida como a
quantidade de energia liberada em certo intervalo de tempo, ou seja, quanto
maior a energia liberada em um menor intervalo de tempo maior será a potência.<o:p></o:p></div>
<div class="MsoNormal">
<br /></div>
<div class="MsoNormal">
A energia elétrica entre dois pontos de um condutor é igual
ao trabalho realizado pelas cargas elétricas entre estes dois pontos, ou seja:<o:p></o:p></div>
<div class="MsoNormal">
<br /></div>
<div class="MsoNormal">
Eel=Δq.U<o:p></o:p></div>
<div class="MsoNormal">
<br /></div>
<div class="MsoNormal">
Sendo:<o:p></o:p></div>
<div class="MsoNormal">
<br /></div>
<div class="MsoNormal">
Eel = energia elétrica<o:p></o:p></div>
<div class="MsoNormal">
<br /></div>
<div class="MsoNormal">
Δq = variação de carga elétrica<o:p></o:p></div>
<div class="MsoNormal">
<br /></div>
<div class="MsoNormal">
U = diferença de potencia, tensão elétrica.<o:p></o:p></div>
<div class="MsoNormal">
<br /></div>
<div class="MsoNormal">
Pela definição vimos que a potência é energia por tempo,
logo, a potencia elétrica é energia elétrica por tempo:<o:p></o:p></div>
<div class="MsoNormal">
<br /></div>
<div class="MsoNormal">
P = Eel / Δt<o:p></o:p></div>
<div class="MsoNormal">
Substituindo Eel por Δq.U, temos:<o:p></o:p></div>
<div class="MsoNormal">
P = Δq.U / Δt<o:p></o:p></div>
<div class="MsoNormal">
<br /></div>
<div class="MsoNormal">
Mas, sabemos que Δq/Δt define outra grandeza física, a
corrente elétrica i= Δq/Δt, sendo assim:<o:p></o:p></div>
<div class="MsoNormal">
<br /></div>
<div class="MsoNormal">
P = U. i<o:p></o:p></div>
<div class="MsoNormal">
<br /></div>
<div class="MsoNormal">
E esta é a equação mais utilizada para potência elétrica.<o:p></o:p></div>
<div class="MsoNormal">
<br /></div>
<div class="MsoNormal">
Mas, em muitos exercícios de vestibulares o vestibulando
deve calcular a potência elétrica dissipada em resistores, para resolver estes
exercícios deve-se utilizar a primeira lei de Ohm.<o:p></o:p></div>
<div class="MsoNormal">
<br /></div>
<div class="MsoNormal">
U= R. i<o:p></o:p></div>
<div class="MsoNormal">
<br /></div>
<div class="MsoNormal">
Aplicando a equação de potência elétrica e a equação da
primeira lei de Ohm, temos duas equações para a potência elétrica dissipada em
um resistor.<o:p></o:p></div>
<div class="MsoNormal">
<br /></div>
<div class="MsoNormal">
Primeira equação: P = U . i sendo i = U / R<o:p></o:p></div>
<div class="MsoNormal">
Temos,<o:p></o:p></div>
<div class="MsoNormal">
P = U2 / R<o:p></o:p></div>
<div class="MsoNormal">
Segunda equação: P = U . i sendo U = R.i<o:p></o:p></div>
<div class="MsoNormal">
P = i2. R<br />
<br />
<a href="http://fisicaemconstrucaomeublog.blogspot.com.br/p/3-ano.html"><img alt="http://fisicaemconstrucaomeublog.blogspot.com.br/p/3-ano.html " src="https://encrypted-tbn3.gstatic.com/images?q=tbn:ANd9GcQrV2u4hFsH3jMoj1BUrwZBaIr0MiZltA8J6AEEDuqHYnV2aNGT" /></a><br />
<br />
<o:p></o:p></div>
Alex Fariashttp://www.blogger.com/profile/05866403100330572843noreply@blogger.com0tag:blogger.com,1999:blog-2260264792934765138.post-7797246678974513002015-09-17T11:45:00.000-03:002015-11-03T10:44:50.684-03:00Leis de Ohm: Resistência elétrica, resistividade e leis de Ohm<span style="font-family: "arial" , "helvetica" , sans-serif;"><span style="color: #666666; line-height: 21px;">A resistência elétrica é uma grandeza característica do resistor e mede a dificuldade que os átomos oferecem à passagem da </span><a href="http://fisicaemconstrucaomeublog.blogspot.com.br/2015/09/corrente-eletrica.html">corrente elétrica<span style="color: #666666; line-height: 21px;">.</span></a></span><br />
<span style="font-family: "arial" , "helvetica" , sans-serif;"><br /></span>
<span style="font-family: "arial" , "helvetica" , sans-serif;"><span style="background-color: white; color: #333333; line-height: 24px;">No inicio do século 19, o físico alemão </span><a href="http://fisicaemconstrucaomeublog.blogspot.com.br/p/georg-simon-ohm.html" target="_blank">Georg Simon Ohm</a><span style="background-color: white; color: #333333; line-height: 24px;"> (1787-1854) descobriu duas leis que determinam a resistência elétrica dos condutores. Essas leis, em alguns casos, também valem para os semicondutores e os isolantes.</span></span><br />
<span style="font-family: "arial" , "helvetica" , sans-serif;"><span style="background-color: white; color: #333333; line-height: 24px;"><br /></span></span>
<br />
<h3>
<span style="font-family: "arial" , "helvetica" , sans-serif;"><span style="background-color: white; color: blue; font-size: small; line-height: 24px;">Resistência elétrica</span></span></h3>
<span style="color: #404040; font-family: "droid serif" , serif; font-size: 16px; line-height: 26px;">A </span><span style="background-attachment: initial; background-clip: initial; background-image: initial; background-origin: initial; background-position: 0px 0px; background-repeat: initial; background-size: initial; border: 0px; box-sizing: border-box; color: #404040; font-family: "droid serif" , serif; font-size: 16px; font-weight: 700; line-height: 26px; margin: 0px; outline: 0px; padding: 0px; vertical-align: baseline;">resistência elétrica</span><span style="color: #404040; font-family: "droid serif" , serif; font-size: 16px; line-height: 26px;">, medida sob a grandeza </span><span style="background-attachment: initial; background-clip: initial; background-image: initial; background-origin: initial; background-position: 0px 0px; background-repeat: initial; background-size: initial; border: 0px; box-sizing: border-box; color: #404040; font-family: "droid serif" , serif; font-size: 16px; font-weight: 700; line-height: 26px; margin: 0px; outline: 0px; padding: 0px; vertical-align: baseline;">Ω</span><span style="color: #404040; font-family: "droid serif" , serif; font-size: 16px; line-height: 26px;"> (</span><span style="background-attachment: initial; background-clip: initial; background-image: initial; background-origin: initial; background-position: 0px 0px; background-repeat: initial; background-size: initial; border: 0px; box-sizing: border-box; color: #404040; font-family: "droid serif" , serif; font-size: 16px; font-weight: 700; line-height: 26px; margin: 0px; outline: 0px; padding: 0px; vertical-align: baseline;">Ohm</span><span style="color: #404040; font-family: "droid serif" , serif; font-size: 16px; line-height: 26px;">), designa a capacidade que um condutor tem de se opor à passagem de corrente elétrica. Em outras palavras, a função da resistência elétrica é de dificultar a passagem de corrente elétrica. Observe que a resistência de 1 Ω (ohm) equivale a 1V/A (Volts/Ampere)</span><br />
<span style="color: #404040; font-family: "droid serif" , serif; font-size: 16px; line-height: 26px;"><br /></span>
<br />
<h3 style="background-attachment: initial; background-clip: initial; background-image: initial; background-origin: initial; background-position: 0px 0px; background-repeat: initial; background-size: initial; border: 0px; box-sizing: border-box; font-family: 'Open Sans', sans-serif; line-height: 1.3; margin: 0px; outline: 0px; padding: 0px 0px 0.5em; vertical-align: baseline;">
<span style="color: blue; font-size: small;">Primeira Lei de Ohm</span></h3>
<div style="background-attachment: initial; background-clip: initial; background-image: initial; background-origin: initial; background-position: 0px 0px; background-repeat: initial; background-size: initial; border: 0px; box-sizing: border-box; color: #404040; font-family: 'Droid Serif', serif; font-size: 16px; line-height: 1.625; outline: 0px; padding: 0.5em 0px; vertical-align: baseline;">
A <span style="background-attachment: initial; background-clip: initial; background-image: initial; background-origin: initial; background-position: 0px 0px; background-repeat: initial; background-size: initial; border: 0px; box-sizing: border-box; font-weight: 700; margin: 0px; outline: 0px; padding: 0px; vertical-align: baseline;">Primeira Lei de Ohm</span> postula que um condutor ôhmico (resistência constante), mantido à temperatura constante, a intensidade (i) de corrente elétrica será proporcional à diferença de potencial (ddp) aplicada entre suas extremidades, ou seja, sua resistência elétrica é constante. É representada pela seguinte fórmula:</div>
<div style="background-attachment: initial; background-clip: initial; background-image: initial; background-origin: initial; background-position: 0px 0px; background-repeat: initial; background-size: initial; border: 0px; box-sizing: border-box; color: #404040; font-family: 'Droid Serif', serif; font-size: 16px; line-height: 1.625; outline: 0px; padding: 0.5em 0px; vertical-align: baseline;">
<span style="background-attachment: initial; background-clip: initial; background-image: initial; background-origin: initial; background-position: 0px 0px; background-repeat: initial; background-size: initial; border: 0px; box-sizing: border-box; font-weight: 700; margin: 0px; outline: 0px; padding: 0px; vertical-align: baseline;"><img alt="Leis de Ohm" class="img-article" src="http://static.todamateria.com.br/upload/53/bb/53bb3e436b552-leis-de-ohm.jpg" style="background-attachment: initial; background-clip: initial; background-image: initial; background-origin: initial; background-position: 0px 0px; background-repeat: initial; background-size: initial; border: 0px; box-sizing: border-box; height: auto; margin: 0px; max-width: 100%; outline: 0px; padding: 0px; vertical-align: baseline;" width="76" /></span> ou <span style="background-attachment: initial; background-clip: initial; background-image: initial; background-origin: initial; background-position: 0px 0px; background-repeat: initial; background-size: initial; border: 0px; box-sizing: border-box; font-weight: 700; margin: 0px; outline: 0px; padding: 0px; vertical-align: baseline;"><img alt="Leis de Ohm" class="img-article" src="http://static.todamateria.com.br/upload/53/bb/53bb3e4c4778c-leis-de-ohm.jpg" style="background-attachment: initial; background-clip: initial; background-image: initial; background-origin: initial; background-position: 0px 0px; background-repeat: initial; background-size: initial; border: 0px; box-sizing: border-box; height: auto; margin: 0px; max-width: 100%; outline: 0px; padding: 0px; vertical-align: baseline;" width="86" /></span></div>
<div style="background-attachment: initial; background-clip: initial; background-image: initial; background-origin: initial; background-position: 0px 0px; background-repeat: initial; background-size: initial; border: 0px; box-sizing: border-box; color: #404040; font-family: 'Droid Serif', serif; font-size: 16px; line-height: 1.625; outline: 0px; padding: 0.5em 0px; vertical-align: baseline;">
donde:</div>
<div style="background-attachment: initial; background-clip: initial; background-image: initial; background-origin: initial; background-position: 0px 0px; background-repeat: initial; background-size: initial; border: 0px; box-sizing: border-box; color: #404040; font-family: 'Droid Serif', serif; font-size: 16px; line-height: 1.625; outline: 0px; padding: 0.5em 0px; vertical-align: baseline;">
<span style="background-attachment: initial; background-clip: initial; background-image: initial; background-origin: initial; background-position: 0px 0px; background-repeat: initial; background-size: initial; border: 0px; box-sizing: border-box; font-weight: 700; margin: 0px; outline: 0px; padding: 0px; vertical-align: baseline;">R</span>: resistência, medida em Ohm (Ω)</div>
<div style="background-attachment: initial; background-clip: initial; background-image: initial; background-origin: initial; background-position: 0px 0px; background-repeat: initial; background-size: initial; border: 0px; box-sizing: border-box; color: #404040; font-family: 'Droid Serif', serif; font-size: 16px; line-height: 1.625; outline: 0px; padding: 0.5em 0px; vertical-align: baseline;">
<span style="background-attachment: initial; background-clip: initial; background-image: initial; background-origin: initial; background-position: 0px 0px; background-repeat: initial; background-size: initial; border: 0px; box-sizing: border-box; font-weight: 700; margin: 0px; outline: 0px; padding: 0px; vertical-align: baseline;">U</span>: diferença de potencial elétrico (ddp), medido em Volts (V)</div>
<div style="background-attachment: initial; background-clip: initial; background-image: initial; background-origin: initial; background-position: 0px 0px; background-repeat: initial; background-size: initial; border: 0px; box-sizing: border-box; color: #404040; font-family: 'Droid Serif', serif; font-size: 16px; line-height: 1.625; outline: 0px; padding: 0.5em 0px; vertical-align: baseline;">
<span style="background-attachment: initial; background-clip: initial; background-image: initial; background-origin: initial; background-position: 0px 0px; background-repeat: initial; background-size: initial; border: 0px; box-sizing: border-box; font-weight: 700; margin: 0px; outline: 0px; padding: 0px; vertical-align: baseline;">I</span>: intensidade da corrente elétrica, medida em Ampére (A).</div>
<h3 style="background-attachment: initial; background-clip: initial; background-image: initial; background-origin: initial; background-position: 0px 0px; background-repeat: initial; background-size: initial; border: 0px; box-sizing: border-box; font-family: 'Open Sans', sans-serif; line-height: 1.3; margin: 0px; outline: 0px; padding: 1em 0px 0.5em; vertical-align: baseline;">
<span style="color: blue; font-size: small;">Segunda Lei de Ohm</span></h3>
<div style="background-attachment: initial; background-clip: initial; background-image: initial; background-origin: initial; background-position: 0px 0px; background-repeat: initial; background-size: initial; border: 0px; box-sizing: border-box; color: #404040; font-family: 'Droid Serif', serif; font-size: 16px; line-height: 1.625; outline: 0px; padding: 0.5em 0px; vertical-align: baseline;">
A <span style="background-attachment: initial; background-clip: initial; background-image: initial; background-origin: initial; background-position: 0px 0px; background-repeat: initial; background-size: initial; border: 0px; box-sizing: border-box; font-weight: 700; margin: 0px; outline: 0px; padding: 0px; vertical-align: baseline;">Segunda Lei de Ohm</span> estabelece que a resistência elétrica de um material é diretamente proporcional ao seu comprimento, inversamente proporcional à sua área de secção transversal e depende do material do qual é constituído, sendo representada pela seguinte fórmula:</div>
<div style="background-attachment: initial; background-clip: initial; background-image: initial; background-origin: initial; background-position: 0px 0px; background-repeat: initial; background-size: initial; border: 0px; box-sizing: border-box; color: #404040; font-family: 'Droid Serif', serif; font-size: 16px; line-height: 1.625; outline: 0px; padding: 0.5em 0px; vertical-align: baseline;">
<span style="background-attachment: initial; background-clip: initial; background-image: initial; background-origin: initial; background-position: 0px 0px; background-repeat: initial; background-size: initial; border: 0px; box-sizing: border-box; font-weight: 700; margin: 0px; outline: 0px; padding: 0px; vertical-align: baseline;"><img alt="Leis de Ohm" class="img-article" src="http://static.todamateria.com.br/upload/53/bb/53bb3e55e0721-leis-de-ohm.jpg" style="background-attachment: initial; background-clip: initial; background-image: initial; background-origin: initial; background-position: 0px 0px; background-repeat: initial; background-size: initial; border: 0px; box-sizing: border-box; height: auto; margin: 0px; max-width: 100%; outline: 0px; padding: 0px; vertical-align: baseline;" width="100" /></span></div>
<div style="background-attachment: initial; background-clip: initial; background-image: initial; background-origin: initial; background-position: 0px 0px; background-repeat: initial; background-size: initial; border: 0px; box-sizing: border-box; color: #404040; font-family: 'Droid Serif', serif; font-size: 16px; line-height: 1.625; outline: 0px; padding: 0.5em 0px; vertical-align: baseline;">
donde:</div>
<div style="background-attachment: initial; background-clip: initial; background-image: initial; background-origin: initial; background-position: 0px 0px; background-repeat: initial; background-size: initial; border: 0px; box-sizing: border-box; color: #404040; font-family: 'Droid Serif', serif; font-size: 16px; line-height: 1.625; outline: 0px; padding: 0.5em 0px; vertical-align: baseline;">
<span style="background-attachment: initial; background-clip: initial; background-image: initial; background-origin: initial; background-position: 0px 0px; background-repeat: initial; background-size: initial; border: 0px; box-sizing: border-box; font-weight: 700; margin: 0px; outline: 0px; padding: 0px; vertical-align: baseline;">R</span>: resistência (Ω)</div>
<div style="background-attachment: initial; background-clip: initial; background-image: initial; background-origin: initial; background-position: 0px 0px; background-repeat: initial; background-size: initial; border: 0px; box-sizing: border-box; color: #404040; font-family: 'Droid Serif', serif; font-size: 16px; line-height: 1.625; outline: 0px; padding: 0.5em 0px; vertical-align: baseline;">
<span style="background-attachment: initial; background-clip: initial; background-image: initial; background-origin: initial; background-position: 0px 0px; background-repeat: initial; background-size: initial; border: 0px; box-sizing: border-box; font-weight: 700; margin: 0px; outline: 0px; padding: 0px; vertical-align: baseline;">ρ</span>: resistividade do condutor (depende do material e de sua temperatura, medida em Ω.m)</div>
<div style="background-attachment: initial; background-clip: initial; background-image: initial; background-origin: initial; background-position: 0px 0px; background-repeat: initial; background-size: initial; border: 0px; box-sizing: border-box; color: #404040; font-family: 'Droid Serif', serif; font-size: 16px; line-height: 1.625; outline: 0px; padding: 0.5em 0px; vertical-align: baseline;">
<span style="background-attachment: initial; background-clip: initial; background-image: initial; background-origin: initial; background-position: 0px 0px; background-repeat: initial; background-size: initial; border: 0px; box-sizing: border-box; font-weight: 700; margin: 0px; outline: 0px; padding: 0px; vertical-align: baseline;">L</span>: comprimento (m)</div>
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<span style="background-attachment: initial; background-clip: initial; background-image: initial; background-origin: initial; background-position: 0px 0px; background-repeat: initial; background-size: initial; border: 0px; box-sizing: border-box; font-weight: 700; margin: 0px; outline: 0px; padding: 0px; vertical-align: baseline;">A</span>: área de secção transversal (mm<span style="box-sizing: border-box; font-size: 12px; line-height: 0; position: relative; top: -0.5em; vertical-align: baseline;">2</span>)<br />
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<iframe width="600" height="450" src="https://www.youtube.com/embed/9LGn11bmfh4" frameborder="0" allowfullscreen></iframe>Alex Fariashttp://www.blogger.com/profile/05866403100330572843noreply@blogger.com0tag:blogger.com,1999:blog-2260264792934765138.post-91751434478905224512015-09-16T16:57:00.002-03:002015-09-17T11:25:54.525-03:00Resistores<div align="justify" class="titulo" style="background-color: white; margin-bottom: 8px; margin-top: 8px;">
<span style="font-family: Arial, Helvetica, sans-serif;">São peças utilizadas em circuitos elétricos que tem como principal função converter energia elétrica em energia térmica, ou seja, são usados como aquecedores ou como dissipadores de eletricidade.</span></div>
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<span style="font-family: Arial, Helvetica, sans-serif;">Alguns exemplos de resistores utilizados no nosso cotidiano são: o filamento de uma lâmpada incandescente, o aquecedor de um chuveiro elétrico, os filamentos que são aquecidos em uma estufa, entre outros.</span></div>
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<span style="font-family: Arial, Helvetica, sans-serif;">Em circuitos elétricos teóricos costuma-se considerar toda a resistência encontrada proveniente de resistores, ou seja, são consideradas as ligações entre eles como condutores ideais (que não apresentam resistência), e utilizam-se as representações:</span></div>
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<a href="http://4.bp.blogspot.com/-ln7U8d7AMoo/VfnAJzMNT-I/AAAAAAAABBs/F1550Z03VBA/s1600/video-icone-casete.png" imageanchor="1" style="clear: left; float: left; margin-bottom: 1em; margin-right: 1em;"></a><a href="http://fisicaemconstrucaomeublog.blogspot.com.br/p/histo.html"><img border="0" height="200" src="http://4.bp.blogspot.com/-ln7U8d7AMoo/VfnAJzMNT-I/AAAAAAAABBs/F1550Z03VBA/s200/video-icone-casete.png" width="200" /></a><span style="text-align: right;"> </span><a href="http://fisicaemconstrucaomeublog.blogspot.com.br/p/historia-da-eletricidade-f-oi.html"><img alt="" border="0" src="http://howto.nicubunu.ro/inkscape_shiny_arrow/arrow_process.png" style="color: #555555; font-family: helvetica, sans-serif; font-size: 14px;" title="Um pouco de história" /></a></div>
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<b>Definição: </b><span style="background-color: white; color: #252525; font-family: sans-serif; font-size: 14px; line-height: 22.4px;">Denominamos corrente elétrica a todo movimento ordenado de partículas eletrizadas. Para que esses movimentos ocorram é necessário haver tais partículas − íons ou elétrons − livres no interior dos corpos. </span><span style="background-color: white; color: #252525; font-family: sans-serif; font-size: 14px; line-height: 22.4px;">Corpos que possuem partículas eletrizadas livres em quantidades razoáveis são denominados condutores, pois essa característica permite estabelecer corrente elétrica em seu interior</span></div>
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<table align="center" cellpadding="0" cellspacing="0" class="tr-caption-container" style="margin-left: auto; margin-right: auto; text-align: center;"><tbody>
<tr><td style="text-align: center;"><a href="http://1.bp.blogspot.com/-tv9FRMYFMeQ/VfmwuS7WJ1I/AAAAAAAABBQ/_wHB-yrJ2C8/s1600/Fluxo-da-Corrente-eletrica.gif" imageanchor="1" style="clear: left; display: inline !important; margin-bottom: 1em; margin-right: 1em;"><img border="0" src="http://1.bp.blogspot.com/-tv9FRMYFMeQ/VfmwuS7WJ1I/AAAAAAAABBQ/_wHB-yrJ2C8/s320/Fluxo-da-Corrente-eletrica.gif" /></a></td></tr>
<tr><td class="tr-caption" style="text-align: center;">Disponível em: http://www.dreaminc.com.br/sala_de_aula/entendendo-o-atomo/</td></tr>
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<span class="mw-headline" id="Corrente_cont.C3.ADnua"><b>Corrente contínua: </b></span><span style="color: #252525; font-size: 14px; line-height: 22.4px;"> É</span><span style="font-size: 14px; line-height: 22.4px;"> o fluxo ordenado de </span><a href="https://pt.wikipedia.org/wiki/Carga_el%C3%A9trica" style="background-attachment: initial; background-clip: initial; background-image: none; background-origin: initial; background-position: initial; background-repeat: initial; background-size: initial; font-size: 14px; line-height: 22.4px; text-decoration: none;" title="Carga elétrica">cargas elétricas</a><span style="font-size: 14px; line-height: 22.4px;"> no mesmo sentido. Esse tipo de corrente é gerado por </span><a class="mw-redirect" href="https://pt.wikipedia.org/wiki/Bateria_(qu%C3%ADmica)" style="background-attachment: initial; background-clip: initial; background-image: none; background-origin: initial; background-position: initial; background-repeat: initial; background-size: initial; font-size: 14px; line-height: 22.4px; text-decoration: none;" title="Bateria (química)">baterias</a><span style="font-size: 14px; line-height: 22.4px;"> de automóveis ou de motos (6, 12 ou 24V), pequenas baterias (geralmente de 9V), </span><a href="https://pt.wikipedia.org/wiki/Pilha" style="background-attachment: initial; background-clip: initial; background-image: none; background-origin: initial; background-position: initial; background-repeat: initial; background-size: initial; font-size: 14px; line-height: 22.4px; text-decoration: none;" title="Pilha">pilhas</a><span style="font-size: 14px; line-height: 22.4px;"> (1,2V e 1,5V), </span><a href="https://pt.wikipedia.org/wiki/D%C3%ADnamo" style="background-attachment: initial; background-clip: initial; background-image: none; background-origin: initial; background-position: initial; background-repeat: initial; background-size: initial; font-size: 14px; line-height: 22.4px; text-decoration: none;" title="Dínamo">dínamos</a><span style="font-size: 14px; line-height: 22.4px;">,</span><a href="https://pt.wikipedia.org/wiki/C%C3%A9lula_solar" style="background-attachment: initial; background-clip: initial; background-image: none; background-origin: initial; background-position: initial; background-repeat: initial; background-size: initial; font-size: 14px; line-height: 22.4px; text-decoration: none;" title="Célula solar">células solares</a><span style="font-size: 14px; line-height: 22.4px;"> e </span><a href="https://pt.wikipedia.org/wiki/Fonte_de_alimenta%C3%A7%C3%A3o" style="background-attachment: initial; background-clip: initial; background-image: none; background-origin: initial; background-position: initial; background-repeat: initial; background-size: initial; font-size: 14px; line-height: 22.4px; text-decoration: none;" title="Fonte de alimentação">fontes de alimentação</a><span style="font-size: 14px; line-height: 22.4px;"> de várias tecnologias, que </span><a href="https://pt.wikipedia.org/wiki/Retifica%C3%A7%C3%A3o" style="background-attachment: initial; background-clip: initial; background-image: none; background-origin: initial; background-position: initial; background-repeat: initial; background-size: initial; font-size: 14px; line-height: 22.4px; text-decoration: none;" title="Retificação">retificam</a><span style="font-size: 14px; line-height: 22.4px;"> a </span><a href="https://pt.wikipedia.org/wiki/Corrente_alternada" style="background-attachment: initial; background-clip: initial; background-image: none; background-origin: initial; background-position: initial; background-repeat: initial; background-size: initial; font-size: 14px; line-height: 22.4px; text-decoration: none;" title="Corrente alternada">corrente alternada</a><span style="font-size: 14px; line-height: 22.4px;"> para produzir corrente contínua.</span></div>
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<span class="mw-headline" id="Corrente_alternada">Corrente alternada: </span><span style="font-weight: normal;"><span style="color: #252525; font-size: 14px; line-height: 22.4px;">É uma corrente elétrica cujo sentido varia no tempo, ao contrário da </span><a href="https://pt.wikipedia.org/wiki/Corrente_cont%C3%ADnua" style="background-attachment: initial; background-clip: initial; background-image: none; background-origin: initial; background-position: initial; background-repeat: initial; background-size: initial; color: #0b0080; font-size: 14px; line-height: 22.4px; text-decoration: none;" title="Corrente contínua">corrente contínua</a>, <span style="color: #252525; font-size: 14px; line-height: 22.4px;">cujo sentido permanece constante ao longo do tempo. A forma de onda usual em um circuito de potência CA é </span><a class="mw-redirect" href="https://pt.wikipedia.org/wiki/Onda_senoidal" style="background-attachment: initial; background-clip: initial; background-image: none; background-origin: initial; background-position: initial; background-repeat: initial; background-size: initial; color: #0b0080; font-size: 14px; line-height: 22.4px; text-decoration: none;" title="Onda senoidal">senoidal</a><span style="color: #252525; font-size: 14px; line-height: 22.4px;"> por ser a forma de transmissão de energia mais eficiente.</span></span></h3>
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<a href="http://1.bp.blogspot.com/-gdij0h_mvJo/VfmzuT-RoUI/AAAAAAAABBc/4DLx-0aCaEY/s1600/corrente.png" imageanchor="1" style="clear: left; float: left; margin-bottom: 1em; margin-right: 1em;"><img border="0" src="http://1.bp.blogspot.com/-gdij0h_mvJo/VfmzuT-RoUI/AAAAAAAABBc/4DLx-0aCaEY/s1600/corrente.png" /></a></div>
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INTENSIDADE DE CORRENTE ELÉTRICA</h2>
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Definimos intensidade de corrente elétrica como sendo a quantidade de carga que passa numa seção transversal de um condutor durante um certo intervalo de tempo.</div>
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<img align="bottom" alt="Corrente elétrica" class="aligncenter tie-appear" src="http://www.coladaweb.com/wp-content/uploads/27_54a3e4cc69a68.jpg" height="59" style="border: 0px none; box-sizing: border-box; clear: both; display: block; height: auto; list-style: none; margin: 5px auto; max-width: 100%; opacity: 1; outline: none; padding: 0px; transition: all 0.4s ease-in-out; vertical-align: middle;" width="180" />É importante dizer que seção transversal é um corte feito no fio para medir, como num pedágio, quantos elétrons passa por ali num intervalo de tempo.</div>
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Portanto, podemos escrever que:</div>
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<img align="bottom" alt="Corrente elétrica" class="aligncenter tie-appear" src="http://www.coladaweb.com/wp-content/uploads/i.jpg" height="54" style="border: 0px none; box-sizing: border-box; clear: both; display: block; height: auto; list-style: none; margin: 5px auto; max-width: 100%; opacity: 1; outline: none; padding: 0px; transition: all 0.4s ease-in-out; vertical-align: middle;" width="61" /></div>
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<span style="border: 0px none; box-sizing: border-box; list-style: none; margin: 0px; outline: none; padding: 0px; text-decoration: underline;">UNIDADES NO SI</span>:</div>
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Q = carga elétrica >>>> Coulomb (C)<br />
Delta t = intervalo de tempo >>> segundo (s)<br />
i = intensidade de corrente elétrica >>>Coulomb por segundo (C/s) = Ampere (A)</div>
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<u>>>>></u> FREQÜENTEMENTE UTILIZAMOS SUBMÚLTIPLOS DO AMPERE.</div>
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1 mA = 10<sup style="border: 0px none; box-sizing: border-box; list-style: none; margin: 0px; outline: none; padding: 0px;">-3</sup> A (miliampere)<br />
1 uA = 10<sup style="border: 0px none; box-sizing: border-box; list-style: none; margin: 0px; outline: none; padding: 0px;">-6</sup> A (microampere)<br />
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Dúvidas>>>>>> <a href="http://fisicaemconstrucaomeublog.blogspot.com.br/p/chat-fisica.html">Chat</a> <<<<< <a href="http://fisicaforum.livreforum.com/f1-seu-primeiro-forum" target="_blank">fórum</a><br />
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Fontes:<br />
<a href="http://www.coladaweb.com/fisica/eletricidade/corrente-eletrica" target="_blank">http://www.coladaweb.com/fisica/eletricidade/corrente-eletrica</a><a href="https://pt.wikipedia.org/wiki/Corrente_el%C3%A9trica#Conceito_de_corrente_el.C3.A9trica" target="_blank">https://pt.wikipedia.org/wiki/Corrente_el%C3%A9trica#Conceito_de_corrente_el.C3.A9trica</a></div>
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<span style="color: #333333; font-family: Droid Sans, Arial, Verdana, sans-serif;"><a href="http://fisicaemconstrucaomeublog.blogspot.com.br/p/3-ano.html">3º Ano</a></span></div>
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Alex Fariashttp://www.blogger.com/profile/05866403100330572843noreply@blogger.com1tag:blogger.com,1999:blog-2260264792934765138.post-64756875952930894732015-08-12T10:43:00.002-03:002016-01-28T21:42:18.916-03:00O uso do Blog no Ensino de Física<div style="display: block; font-family: "helvetica" , "arial" , sans-serif; font-size: 14px; font-stretch: normal; font-style: normal; font-variant: normal; font-weight: normal; line-height: normal; margin: 12px auto 6px auto;">
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