{"id":16887,"date":"2024-09-21T15:24:05","date_gmt":"2024-09-21T18:24:05","guid":{"rendered":"https:\/\/xequematenem.com.br\/blog\/?p=16887"},"modified":"2024-09-21T15:24:06","modified_gmt":"2024-09-21T18:24:06","slug":"questao-110-enem-2017","status":"publish","type":"post","link":"https:\/\/xequematenem.com.br\/blog\/questao-110-enem-2017\/","title":{"rendered":"Quest\u00e3o 110 &#8211; ENEM 2017"},"content":{"rendered":"\n<p class=\"wp-block-paragraph\">Fus\u00edvel \u00e9 um dispositivo de prote\u00e7\u00e3o contra sobrecorrente em circuitos. Quando a corrente que passa por esse componente el\u00e9trico \u00e9 maior que sua m\u00e1xima corrente nominal, o fus\u00edvel queima. Dessa forma, evita que a corrente elevada danifique os aparelhos do circuito. Suponha que o circuito el\u00e9trico mostrado seja alimentado por uma fonte de tens\u00e3o U e que o fus\u00edvel suporte uma corrente nominal de 500 mA.<\/p>\n\n\n\n<figure class=\"wp-block-image size-full\"><img fetchpriority=\"high\" decoding=\"async\" width=\"346\" height=\"269\" src=\"https:\/\/xequematenem.com.br\/blog\/wp-content\/uploads\/2024\/09\/image-608.png\" alt=\"\" class=\"wp-image-16888\" title=\"\" srcset=\"https:\/\/xequematenem.com.br\/blog\/wp-content\/uploads\/2024\/09\/image-608.png 346w, https:\/\/xequematenem.com.br\/blog\/wp-content\/uploads\/2024\/09\/image-608-300x233.png 300w\" sizes=\"(max-width: 346px) 100vw, 346px\" \/><\/figure>\n\n\n\n<p class=\"wp-block-paragraph\">Qual \u00e9 o m\u00e1ximo valor da tens\u00e3o U para que o fus\u00edvel n\u00e3o queime?&nbsp;<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">A) 20 V&nbsp;<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">B) 40 V&nbsp;<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">C) 60 V&nbsp;<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">D) 120 V&nbsp;<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">E) 185 V<\/p>\n\n\n\n<p class=\"has-text-align-center has-large-font-size wp-block-paragraph\"><strong>Solu\u00e7\u00e3o<\/strong><\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Na situa\u00e7\u00e3o limite, o valor da corrente m\u00e1xima que poder\u00e1 passar pelo fus\u00edvel \u00e9 de i<sub>i<\/sub> = 0,5A. Ainda na situa\u00e7\u00e3o limite, essa deve ser a mesma corrente que passa pelo resistor R<sub>1<\/sub> = 120\u03a9\u00a0<\/p>\n\n\n\n<figure class=\"wp-block-image\"><img decoding=\"async\" data-src=\"https:\/\/lh7-rt.googleusercontent.com\/docsz\/AD_4nXePKHdZvaQr1qk09momOJxTQxQ4oZ2s48e13ges4Z9SR_Rnj9WO2z6CYT4b1LzsawaiegnOrpxASAdTfUqHmDNfSrmoSZ3EPYaJLad1ehX0AQDRAXScJY5bOgvneDbqTFhWAFeKCfIlvtS3gFbY4Ec0MDNj?key=cZZoT8Y6vO0sxb39wzql9g\" alt=\"\" title=\"\" src=\"data:image\/svg+xml;base64,PHN2ZyB3aWR0aD0iMSIgaGVpZ2h0PSIxIiB4bWxucz0iaHR0cDovL3d3dy53My5vcmcvMjAwMC9zdmciPjwvc3ZnPg==\" class=\"lazyload\"><\/figure>\n\n\n\n<p class=\"wp-block-paragraph\">Dessa forma, usando a lei de Ohm, podemos calcular a tens\u00e3o entre A e B<\/p>\n\n\n\n<figure class=\"wp-block-image size-full\"><img decoding=\"async\" width=\"217\" height=\"93\" data-src=\"https:\/\/xequematenem.com.br\/blog\/wp-content\/uploads\/2024\/09\/image-609.png\" alt=\"\" class=\"wp-image-16889 lazyload\" title=\"\" src=\"data:image\/svg+xml;base64,PHN2ZyB3aWR0aD0iMSIgaGVpZ2h0PSIxIiB4bWxucz0iaHR0cDovL3d3dy53My5vcmcvMjAwMC9zdmciPjwvc3ZnPg==\" style=\"--smush-placeholder-width: 217px; --smush-placeholder-aspect-ratio: 217\/93;\"><\/figure>\n\n\n\n<p class=\"wp-block-paragraph\">E sabendo agora que a tens\u00e3o foi de 60 V, podemos calcular a corrente que passa entre A e B no resistor de 60:<\/p>\n\n\n\n<figure class=\"wp-block-image\"><img decoding=\"async\" data-src=\"https:\/\/lh7-rt.googleusercontent.com\/docsz\/AD_4nXe1nX8TbnR0NKNMhMQvhSq5mlimifsFUkCyjIip5O_zFjOKegIp9rdM1L6Lztmwa8g8XTlHE-s8zh0Dpw-i0Af8arUHUdOCJxms7AbAC6dc2nplXRVUU_aunROa1fwNFN27iw5xxJGYR7aoOb-WC4pNyCA?key=cZZoT8Y6vO0sxb39wzql9g\" alt=\"\" title=\"\" src=\"data:image\/svg+xml;base64,PHN2ZyB3aWR0aD0iMSIgaGVpZ2h0PSIxIiB4bWxucz0iaHR0cDovL3d3dy53My5vcmcvMjAwMC9zdmciPjwvc3ZnPg==\" class=\"lazyload\"><\/figure>\n\n\n\n<figure class=\"wp-block-image size-full\"><img decoding=\"async\" width=\"119\" height=\"116\" data-src=\"https:\/\/xequematenem.com.br\/blog\/wp-content\/uploads\/2024\/09\/image-610.png\" alt=\"\" class=\"wp-image-16890 lazyload\" title=\"\" src=\"data:image\/svg+xml;base64,PHN2ZyB3aWR0aD0iMSIgaGVpZ2h0PSIxIiB4bWxucz0iaHR0cDovL3d3dy53My5vcmcvMjAwMC9zdmciPjwvc3ZnPg==\" style=\"--smush-placeholder-width: 119px; --smush-placeholder-aspect-ratio: 119\/116;\"><\/figure>\n\n\n\n<p class=\"wp-block-paragraph\">E utilizando a lei dos N\u00f3s (Primeira lei de Kirchhoff) saberemos qual a corrente total que passa entre A e B<\/p>\n\n\n\n<figure class=\"wp-block-image size-full\"><img decoding=\"async\" width=\"206\" height=\"88\" data-src=\"https:\/\/xequematenem.com.br\/blog\/wp-content\/uploads\/2024\/09\/image-611.png\" alt=\"\" class=\"wp-image-16891 lazyload\" title=\"\" src=\"data:image\/svg+xml;base64,PHN2ZyB3aWR0aD0iMSIgaGVpZ2h0PSIxIiB4bWxucz0iaHR0cDovL3d3dy53My5vcmcvMjAwMC9zdmciPjwvc3ZnPg==\" style=\"--smush-placeholder-width: 206px; --smush-placeholder-aspect-ratio: 206\/88;\"><\/figure>\n\n\n\n<p class=\"wp-block-paragraph\">Dessa forma, podemos calcular a tens\u00e3o entre B e C:<\/p>\n\n\n\n<figure class=\"wp-block-image\"><img decoding=\"async\" data-src=\"https:\/\/lh7-rt.googleusercontent.com\/docsz\/AD_4nXebNESh_PnNTom0VqhSzpKk5KP5HQLMIsIevJmcrnQMAbkuLzRFeXQzmQiACYbXOrjuyz_dY2jXmcNKLHd7l4ZkTbB9E4bfxtVbdXEg5fCtuwl265g6rUNd1H12eohcNzfsphjiAWp-FLhRF36JrEvxDwhW?key=cZZoT8Y6vO0sxb39wzql9g\" alt=\"\" title=\"\" src=\"data:image\/svg+xml;base64,PHN2ZyB3aWR0aD0iMSIgaGVpZ2h0PSIxIiB4bWxucz0iaHR0cDovL3d3dy53My5vcmcvMjAwMC9zdmciPjwvc3ZnPg==\" class=\"lazyload\"><\/figure>\n\n\n\n<figure class=\"wp-block-image size-full\"><img decoding=\"async\" width=\"182\" height=\"105\" data-src=\"https:\/\/xequematenem.com.br\/blog\/wp-content\/uploads\/2024\/09\/image-612.png\" alt=\"\" class=\"wp-image-16892 lazyload\" title=\"\" src=\"data:image\/svg+xml;base64,PHN2ZyB3aWR0aD0iMSIgaGVpZ2h0PSIxIiB4bWxucz0iaHR0cDovL3d3dy53My5vcmcvMjAwMC9zdmciPjwvc3ZnPg==\" style=\"--smush-placeholder-width: 182px; --smush-placeholder-aspect-ratio: 182\/105;\"><\/figure>\n\n\n\n<p class=\"wp-block-paragraph\">Dessa forma, se a diferen\u00e7a de potencial entre AB \u00e9 de 60 V e a diferen\u00e7a de potencial entre BC s\u00e3o 60 V, a diferen\u00e7a de potencial de AC deve ser de 120V.&nbsp;<\/p>\n\n\n\n<figure class=\"wp-block-image\"><img decoding=\"async\" data-src=\"https:\/\/lh7-rt.googleusercontent.com\/docsz\/AD_4nXfHOm-gpnzHKHldEsdIKUp0Gttqa4ciRcOuaomO9kyknqDH1IkMMHw_Nd4LVVRsyZefAbAi0OSXNoLPSgMqGVr4Aj6M2O17-ZuBSu8CdQwbEZsKiunW0Zt4FM-TzuG0-SIAEj0xOSG3ZTfGD14frDmondnK?key=cZZoT8Y6vO0sxb39wzql9g\" alt=\"\" title=\"\" src=\"data:image\/svg+xml;base64,PHN2ZyB3aWR0aD0iMSIgaGVpZ2h0PSIxIiB4bWxucz0iaHR0cDovL3d3dy53My5vcmcvMjAwMC9zdmciPjwvc3ZnPg==\" class=\"lazyload\"><\/figure>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>Alternativa D<\/strong><\/p>\n","protected":false},"excerpt":{"rendered":"<p>Fus\u00edvel \u00e9 um dispositivo de prote\u00e7\u00e3o contra sobrecorrente em circuitos. Quando a corrente que passa por esse componente el\u00e9trico \u00e9 maior que sua m\u00e1xima corrente nominal, o fus\u00edvel queima. Dessa forma, evita que a corrente elevada danifique os aparelhos do circuito. Suponha que o circuito el\u00e9trico mostrado seja alimentado por uma fonte de tens\u00e3o U [&hellip;]<\/p>\n","protected":false},"author":11,"featured_media":16888,"comment_status":"open","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[17,18],"tags":[],"area-do-conhecimento":[116,121],"assunto":[],"class_list":["post-16887","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-questoes-do-enem","category-18","area-do-conhecimento-ciencias-da-natureza-e-suas-tecnologias","area-do-conhecimento-fisica"],"_links":{"self":[{"href":"https:\/\/xequematenem.com.br\/blog\/wp-json\/wp\/v2\/posts\/16887","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/xequematenem.com.br\/blog\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/xequematenem.com.br\/blog\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/xequematenem.com.br\/blog\/wp-json\/wp\/v2\/users\/11"}],"replies":[{"embeddable":true,"href":"https:\/\/xequematenem.com.br\/blog\/wp-json\/wp\/v2\/comments?post=16887"}],"version-history":[{"count":1,"href":"https:\/\/xequematenem.com.br\/blog\/wp-json\/wp\/v2\/posts\/16887\/revisions"}],"predecessor-version":[{"id":16893,"href":"https:\/\/xequematenem.com.br\/blog\/wp-json\/wp\/v2\/posts\/16887\/revisions\/16893"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/xequematenem.com.br\/blog\/wp-json\/wp\/v2\/media\/16888"}],"wp:attachment":[{"href":"https:\/\/xequematenem.com.br\/blog\/wp-json\/wp\/v2\/media?parent=16887"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/xequematenem.com.br\/blog\/wp-json\/wp\/v2\/categories?post=16887"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/xequematenem.com.br\/blog\/wp-json\/wp\/v2\/tags?post=16887"},{"taxonomy":"area-do-conhecimento","embeddable":true,"href":"https:\/\/xequematenem.com.br\/blog\/wp-json\/wp\/v2\/area-do-conhecimento?post=16887"},{"taxonomy":"assunto","embeddable":true,"href":"https:\/\/xequematenem.com.br\/blog\/wp-json\/wp\/v2\/assunto?post=16887"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}