{"id":21461,"date":"2020-07-15T00:01:00","date_gmt":"2020-07-15T03:01:00","guid":{"rendered":"https:\/\/www.ufrgs.br\/amlef\/?p=21461"},"modified":"2020-07-15T00:06:58","modified_gmt":"2020-07-15T03:06:58","slug":"a-corrente-no-dia-a-dia","status":"publish","type":"post","link":"https:\/\/www.ufrgs.br\/amlef\/2020\/07\/15\/a-corrente-no-dia-a-dia\/","title":{"rendered":"A corrente no \u201cdia a&nbsp;dia\u201d"},"content":{"rendered":"\n<div class=\"wp-block-group\"><div class=\"wp-block-group__inner-container is-layout-flow wp-block-group-is-layout-flow\">\n<p class=\"wp-block-paragraph\">A impor\u00adt\u00e2n\u00adcia da cor\u00adrente el\u00e9\u00adtrica \u00e9 incon\u00adtes\u00adt\u00e1\u00advel. Ela cons\u00adtan\u00adte\u00admente se faz pre\u00adsente no coti\u00addi\u00adano da soci\u00ade\u00addade \u2014 desde objetos simples, como fog\u00f5es e l\u00e2m\u00adpa\u00addas, at\u00e9 apa\u00adre\u00adlhos com tec\u00adno\u00adlo\u00adgia avan\u00ad\u00e7ada, como com\u00adpu\u00adta\u00addo\u00adres e avi\u00f5es. A ver\u00adsa\u00adti\u00adli\u00addade da energia el\u00e9\u00adtrica se deve a sua faci\u00adli\u00addade de pro\u00addu\u00ad\u00e7\u00e3o, arma\u00adze\u00adna\u00admento e trans\u00adporte, sendo uti\u00adli\u00adzada como etapa de con\u00adver\u00ads\u00e3o entre tipos de energia (t\u00e9rmica, mec\u00e2\u00adnica, qu\u00edmica, etc.). J\u00e1 defi\u00adni\u00admos e sabemos do que se trata a cor\u00adrente el\u00e9\u00adtrica, ent\u00e3o \u00e9 natural que nos per\u00adgun\u00adte\u00admos o porqu\u00ea de a medir\u00admos. Uma res\u00adposta para essa per\u00adgunta seria a segu\u00adran\u00e7a da rede el\u00e9\u00adtrica da sua casa, bem como de seus equi\u00adpa\u00admen\u00adtos, impe\u00addindo a ocor\u00adr\u00ean\u00adcia de inc\u00ean\u00addios ou de danos a seus equi\u00adpa\u00admen\u00adtos eletr\u00f4nicos.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Para ilus\u00adtrar melhor essa res\u00adposta, imagine a seguinte situ\u00ada\u00ad\u00e7\u00e3o: voc\u00ea est\u00e1 em casa e precisa de uma roupa bem passada para uma sa\u00edda com alguns amigos. Para isso, voc\u00ea pega seu ferro el\u00e9\u00adtrico, mas voc\u00ea j\u00e1 parou pra pensar como ele esquenta? Expli\u00adcando de maneira simples: ao ligar seu ferro na tomada h\u00e1 uma pas\u00adsa\u00adgem de cor\u00adrente pelo ferro, a qual atra\u00adves\u00adsar\u00e1 uma resis\u00adt\u00ean\u00adcia, que devido ao Efeito Joule, con\u00adver\u00adter\u00e1 parte da energia el\u00e9\u00adtrica em t\u00e9rmica. Dessa forma, seu ferro \u00e9 aque\u00adcido e permite que voc\u00ea passa sua roupa. Entre\u00adtanto, \u00e9 neces\u00ads\u00e1\u00adria a exis\u00adt\u00ean\u00adcia de meca\u00adnis\u00admos de con\u00adtrole de tem\u00adpe\u00adra\u00adtura, caso con\u00adtr\u00e1\u00adrio seu ferro iria con\u00adti\u00adnuar a aquecer inde\u00adfi\u00adni\u00adda\u00admente, podendo causar s\u00e9rios pro\u00adble\u00admas, como queimar sua roupa. A fim de evitar esse tipo de situ\u00ada\u00ad\u00e7\u00e3o, existe uma l\u00e2mina bime\u00adt\u00e1\u00adlica dentro do ferro que, ao ser sub\u00adme\u00adtida a ele\u00adva\u00addas tem\u00adpe\u00adra\u00adtu\u00adras, se encurva e corta o contato com o cir\u00adcuito, impe\u00addindo a pas\u00adsa\u00adgem de cor\u00adrente e dimi\u00adnuindo a tem\u00adpe\u00adra\u00adtura, de maneira similar ao dis\u00adjun\u00adtor, mas com reli\u00adga\u00admento autom\u00e1tico.<\/p>\n\n\n\n<figure class=\"wp-block-embed-youtube wp-block-embed is-type-video is-provider-youtube wp-embed-aspect-16-9 wp-has-aspect-ratio\"><div class=\"wp-block-embed__wrapper\">\n<iframe loading=\"lazy\" title=\"Como funciona um disjuntor por dentro na pr\u00e1tica sem mimimi\" width=\"1400\" height=\"788\" src=\"https:\/\/www.youtube.com\/embed\/pI9xQrksXUc?start=1800&amp;feature=oembed\" frameborder=\"0\" allow=\"accelerometer; autoplay; encrypted-media; gyroscope; picture-in-picture\" allowfullscreen><\/iframe>\n<\/div><figcaption>Aci\u00adden\u00adtes podem acon\u00adte\u00adcer quando os equi\u00adpa\u00admen\u00adtos de segu\u00adran\u00e7a n\u00e3o fun\u00adci\u00ado\u00adnam cor\u00adre\u00adta\u00admente. Neste v\u00eddeo, o autor desa\u00adti\u00advou os com\u00adpo\u00adnen\u00adtes que des\u00adli\u00adgam o dis\u00adjun\u00adtor e mostra o que acon\u00adtece com a fia\u00e7\u00e3o no caso de falhas de seguran\u00e7a.<\/figcaption><\/figure>\n\n\n\n<p class=\"wp-block-paragraph\">Infe\u00adliz\u00admente, seu ferro de passar veio com defeito, o que causou seu supe\u00adra\u00adque\u00adci\u00admento, e, con\u00adse\u00adquen\u00adte\u00admente, queimou sua roupa. Sua m\u00e3e sente o cheiro de quei\u00admado e decide ave\u00adri\u00adguar a situ\u00ada\u00ad\u00e7\u00e3o. Para evitar levar uma bronca, voc\u00ea esconde as evi\u00add\u00ean\u00adcias antes de sua m\u00e3e chegar no seu quarto. Quando ela chega, voc\u00ea tenta dis\u00adfar\u00ad\u00e7ar e usa de eufe\u00admis\u00admos para sua\u00advi\u00adzar a verdade. Contudo, sua m\u00e3e ainda des\u00adcon\u00adfia de voc\u00ea e, por isso, pega seu pol\u00ed\u00adgrafo (aquele mesmo dos filmes de espi\u00ado\u00adna\u00adgem, n\u00e3o que ela precise disso pra saber que voc\u00ea est\u00e1 men\u00adtindo) para testar a vera\u00adci\u00addade do seu relato. Por acaso, voc\u00ea, alguma vez, se per\u00adgun\u00adtou como um pol\u00ed\u00adgrafo detecta quando algu\u00e9m est\u00e1 men\u00adtindo? Dentre as v\u00e1rias medidas rea\u00adli\u00adza\u00addas, uma delas \u00e9 a vari\u00ada\u00ad\u00e7\u00e3o da con\u00addu\u00adti\u00advi\u00addade el\u00e9\u00adtrica da pele, conhe\u00adcida como Res\u00adposta Gal\u00adv\u00e2\u00adnica da Pele (GSR). Para medi-la, colocam-se duas placas digi\u00adtais entre as quais se aplica uma dife\u00adren\u00e7a de poten\u00adcial el\u00e9\u00adtrico, a vari\u00ada\u00ad\u00e7\u00e3o da pro\u00addu\u00ad\u00e7\u00e3o de suor altera a con\u00addu\u00adti\u00advi\u00addade da pele e, a partir da medida da cor\u00adrente, se percebe essa vari\u00ada\u00ad\u00e7\u00e3o. Sua m\u00e3e, perita no assunto, percebe a sutil pro\u00addu\u00ad\u00e7\u00e3o de suor durante o depoi\u00admento; logo, o coloca de castigo no seu quarto, privando\u2011o de todo e qual\u00adquer acesso \u00e0 tec\u00adno\u00adlo\u00adgia e proibindo\u2011o de sair com seus amigos.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Ente\u00addi\u00adado, voc\u00ea se lembra que anti\u00adga\u00admente n\u00e3o exis\u00adtiam celu\u00adla\u00adres, mas sim tel\u00e9\u00adgra\u00adfos! Voc\u00ea ent\u00e3o se lembra que tem um tel\u00e9\u00adgrafo embaixo da sua cama, o qual foi lhe dado de pre\u00adsente pelo seu av\u00f4, e decide brincar com isso e tentar avisar seus amigos que voc\u00ea n\u00e3o poder\u00e1 sair com eles. Bom, mas o fun\u00adci\u00ado\u00adna\u00admento do tel\u00e9\u00adgrafo \u00e9 uma das cenas dos pr\u00f3\u00adxi\u00admos cap\u00ed\u00adtu\u00adlos, ent\u00e3o fica ligado que tem muita coisa inte\u00adres\u00adsante vindo por&nbsp;a\u00ed!<\/p>\n\n\n\n<h5 class=\"has-text-align-right wp-block-heading\">Francisco Baguinski\/Equipe AMLEF&nbsp;2020<\/h5>\n\n\n\n<hr class=\"wp-block-separator is-style-wide\">\n\n\n\n<p class=\"wp-block-paragraph\"><strong>Saiba  mais<\/strong>:<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">T\u00e1 louco pra enten\u00adder melhor toda a f\u00edsica por tr\u00e1s do seu ferro de passar roupa? Ent\u00e3o \u00e9 s\u00f3 clicar no link que sepa\u00adra\u00admos para&nbsp;voc\u00ea:<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><a href=\"https:\/\/www.youtube.com\/watch?v=pjJNpBkHRM0\">https:\/\/www.youtube.com\/watch?v=pjJNpBkHRM0<\/a><\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Gos\u00adta\u00adria de enten\u00adder melhor como \u00e9 o ter\u00admos\u00adtato do seu ferro? Sepa\u00adra\u00admos um link sobre esse assunto tamb\u00e9m! \u00c9 s\u00f3 dar uma olhada nesse&nbsp;link:<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><a href=\"https:\/\/www.youtube.com\/watch?v=zJdWbVlUvrM\">https:\/\/www.youtube.com\/watch?v=zJdWbVlUvrM<\/a><\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Para aqueles que se inte\u00adres\u00adsam pela segu\u00adran\u00e7a da rede el\u00e9\u00adtrica da sua casa, assim como de seus dis\u00adpo\u00adsi\u00adti\u00advos ele\u00adtr\u00f4\u00adni\u00adcos, n\u00f3s sepa\u00adra\u00admos o v\u00eddeo certo pra sanar sua curiosidade:<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><a href=\"https:\/\/www.youtube.com\/watch?v=1mpgU3Wu9QA\">https:\/\/www.youtube.com\/watch?v=1mpgU3Wu9QA<\/a> <\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Por \u00faltimo, mas n\u00e3o menos impor\u00adtante, n\u00f3s tra\u00adze\u00admos pra voc\u00ea um assunto cho\u00adcante e de deixar voc\u00ea de cabelo em p\u00e9! Veja como e por que ocorre um curto-cir\u00adcuito no link a seguir:<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><a href=\"https:\/\/www.youtube.com\/watch?v=r3WeXBOLuSI\">https:\/\/www.youtube.com\/watch?v=r3WeXBOLuSI<\/a><\/p>\n<\/div><\/div>\n","protected":false},"excerpt":{"rendered":"<p>A impor\u00adt\u00e2n\u00adcia da cor\u00adrente el\u00e9\u00adtrica \u00e9 incon\u00adtes\u00adt\u00e1\u00advel. Ela cons\u00adtan\u00adte\u00admente se faz pre\u00adsente no coti\u00addi\u00adano da soci\u00ade\u00addade \u2014 desde objetos simples, como fog\u00f5es e l\u00e2m\u00adpa\u00addas, at\u00e9 apa\u00adre\u00adlhos com tec\u00adno\u00adlo\u00adgia avan\u00ad\u00e7ada, como com\u00adpu\u00adta\u00addo\u00adres e avi\u00f5es. A ver\u00adsa\u00adti\u00adli\u00addade da energia el\u00e9\u00adtrica se deve a sua faci\u00adli\u00addade de pro\u00addu\u00ad\u00e7\u00e3o, arma\u00adze\u00adna\u00admento e trans\u00adporte, sendo uti\u00adli\u00adzada como etapa de con\u00adver\u00ads\u00e3o&nbsp;entre&nbsp;[\u2026]<\/p>\n","protected":false},"author":10,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_editorskit_title_hidden":false,"_editorskit_reading_time":0,"_editorskit_is_block_options_detached":false,"_editorskit_block_options_position":"{}","wp_typography_post_enhancements_disabled":false,"_jetpack_memberships_contains_paid_content":false,"footnotes":""},"categories":[432,514],"tags":[515,415],"class_list":["post-21461","post","type-post","status-publish","format-standard","hentry","category-destaques","category-exposicaogalvanometros","tag-cotidiano","tag-eletromagnetismo"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v25.8 - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>A corrente no &quot;dia a dia&quot; - Museu dos Laborat\u00f3rios de Ensino de F\u00edsica - Em Transi\u00e7\u00e3o<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/www.ufrgs.br\/amlef\/2020\/07\/15\/a-corrente-no-dia-a-dia\/\" \/>\n<meta property=\"og:locale\" content=\"pt_BR\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"A corrente no &quot;dia a dia&quot; - Museu dos Laborat\u00f3rios de Ensino de F\u00edsica - Em Transi\u00e7\u00e3o\" \/>\n<meta property=\"og:description\" content=\"A impor\u00adt\u00e2n\u00adcia da cor\u00adrente el\u00e9\u00adtrica \u00e9 incon\u00adtes\u00adt\u00e1\u00advel. Ela cons\u00adtan\u00adte\u00admente se faz pre\u00adsente no coti\u00addi\u00adano da soci\u00ade\u00addade \u2014 desde objetos simples, como fog\u00f5es e l\u00e2m\u00adpa\u00addas, at\u00e9 apa\u00adre\u00adlhos com tec\u00adno\u00adlo\u00adgia avan\u00ad\u00e7ada, como com\u00adpu\u00adta\u00addo\u00adres e avi\u00f5es. A ver\u00adsa\u00adti\u00adli\u00addade da energia el\u00e9\u00adtrica se deve a sua faci\u00adli\u00addade de pro\u00addu\u00ad\u00e7\u00e3o, arma\u00adze\u00adna\u00admento e trans\u00adporte, sendo uti\u00adli\u00adzada como etapa de con\u00adver\u00ads\u00e3o entre [&hellip;]\" \/>\n<meta property=\"og:url\" content=\"https:\/\/www.ufrgs.br\/amlef\/2020\/07\/15\/a-corrente-no-dia-a-dia\/\" \/>\n<meta property=\"og:site_name\" content=\"Museu dos Laborat\u00f3rios de Ensino de F\u00edsica - Em Transi\u00e7\u00e3o\" \/>\n<meta property=\"article:publisher\" content=\"https:\/\/www.facebook.com\/AMLEF.IF.UFRGS\" \/>\n<meta property=\"article:published_time\" content=\"2020-07-15T03:01:00+00:00\" \/>\n<meta property=\"article:modified_time\" content=\"2020-07-15T03:06:58+00:00\" \/>\n<meta name=\"author\" content=\"Francisco Baguinski\" \/>\n<meta name=\"twitter:card\" content=\"summary_large_image\" \/>\n<meta name=\"twitter:label1\" content=\"Escrito por\" \/>\n\t<meta name=\"twitter:data1\" content=\"Francisco Baguinski\" \/>\n\t<meta name=\"twitter:label2\" content=\"Est. tempo de leitura\" \/>\n\t<meta name=\"twitter:data2\" content=\"4 minutos\" \/>\n<script type=\"application\/ld+json\" class=\"yoast-schema-graph\">{\"@context\":\"https:\/\/schema.org\",\"@graph\":[{\"@type\":\"Article\",\"@id\":\"https:\/\/www.ufrgs.br\/amlef\/2020\/07\/15\/a-corrente-no-dia-a-dia\/#article\",\"isPartOf\":{\"@id\":\"https:\/\/www.ufrgs.br\/amlef\/2020\/07\/15\/a-corrente-no-dia-a-dia\/\"},\"author\":{\"name\":\"Francisco Baguinski\",\"@id\":\"https:\/\/www.ufrgs.br\/amlef\/#\/schema\/person\/75356db698cc366717e44b2094bde795\"},\"headline\":\"A corrente no \u201cdia a&nbsp;dia\u201d\",\"datePublished\":\"2020-07-15T03:01:00+00:00\",\"dateModified\":\"2020-07-15T03:06:58+00:00\",\"mainEntityOfPage\":{\"@id\":\"https:\/\/www.ufrgs.br\/amlef\/2020\/07\/15\/a-corrente-no-dia-a-dia\/\"},\"wordCount\":832,\"commentCount\":0,\"publisher\":{\"@id\":\"https:\/\/www.ufrgs.br\/amlef\/#organization\"},\"keywords\":[\"Cotidiano\",\"Eletromagnetismo\"],\"articleSection\":[\"Destaques\",\"Exposi\u00e7\u00e3o 2020: De Galvani a Amp\u00e8re\"],\"inLanguage\":\"pt-BR\",\"potentialAction\":[{\"@type\":\"CommentAction\",\"name\":\"Comment\",\"target\":[\"https:\/\/www.ufrgs.br\/amlef\/2020\/07\/15\/a-corrente-no-dia-a-dia\/#respond\"]}]},{\"@type\":\"WebPage\",\"@id\":\"https:\/\/www.ufrgs.br\/amlef\/2020\/07\/15\/a-corrente-no-dia-a-dia\/\",\"url\":\"https:\/\/www.ufrgs.br\/amlef\/2020\/07\/15\/a-corrente-no-dia-a-dia\/\",\"name\":\"A corrente no \\\"dia a dia\\\" - 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