{"id":80661,"date":"2024-01-14T13:14:46","date_gmt":"2024-01-14T13:14:46","guid":{"rendered":"https:\/\/www.electricity-magnetism.org\/calculo-de-capacitores-capacitancia\/"},"modified":"2024-01-20T09:57:57","modified_gmt":"2024-01-20T09:57:57","slug":"calculo-de-capacitores-capacitancia","status":"publish","type":"post","link":"https:\/\/www.electricity-magnetism.org\/pt-br\/calculo-de-capacitores-capacitancia\/","title":{"rendered":"C\u00e1lculo de Capacitores | Capacit\u00e2ncia"},"content":{"rendered":"<h2>C\u00e1lculo de Capacitores<\/h2>\n<p>Os capacitores s\u00e3o componentes fundamentais na eletr\u00f4nica, utilizados para armazenar energia em um campo el\u00e9trico. O c\u00e1lculo da capacit\u00e2ncia de um capacitor \u00e9 essencial para entender seu funcionamento e aplica\u00e7\u00e3o em circuitos eletr\u00f4nicos.<\/p>\n<h2>Capacit\u00e2ncia de um Capacitor<\/h2>\n<p>A capacit\u00e2ncia, representada pela letra C, \u00e9 a medida da capacidade de um capacitor de armazenar carga el\u00e9trica. Ela \u00e9 calculada pela rela\u00e7\u00e3o entre a carga armazenada Q (em coulombs) e a diferen\u00e7a de potencial V (em volts) nos terminais do capacitor, conforme a f\u00f3rmula:<\/p>\n<p><i>C = Q\/V<\/i><\/p>\n<p>onde C \u00e9 a capacit\u00e2ncia em farads (F), Q \u00e9 a carga em coulombs (C), e V \u00e9 a tens\u00e3o em volts (V).<\/p>\n<h2>Capacit\u00e2ncia em Capacitores de Placas Paralelas<\/h2>\n<p>Para capacitores com placas paralelas, a capacit\u00e2ncia pode ser calculada pela f\u00f3rmula:<\/p>\n<p><i>C = \u03b5A\/d<\/i><\/p>\n<p>onde C \u00e9 a capacit\u00e2ncia em farads (F), \u03b5 \u00e9 a permissividade do material diel\u00e9trico entre as placas (em farads por metro, F\/m), A \u00e9 a \u00e1rea das placas em metros quadrados (m\u00b2), e d \u00e9 a dist\u00e2ncia entre as placas em metros (m).<\/p>\n<h2>Permissividade Relativa e Exemplo Pr\u00e1tico<\/h2>\n<p>A permissividade \u00e9 frequentemente representada pela permissividade relativa \u03b5r ou \u03ba, que \u00e9 a raz\u00e3o entre a permissividade absoluta \u03b5 e a permissividade do v\u00e1cuo \u03b50. A rela\u00e7\u00e3o \u00e9 dada por:<\/p>\n<p><i>\u03b5r = \u03ba = \u03b5\/\u03b50<\/i><\/p>\n<p>Por exemplo, para um capacitor de 1 \ud835\udecdF com placas paralelas separadas por 1.0 mm em um v\u00e1cuo, a \u00e1rea das placas \u00e9 calculada como:<\/p>\n<p><i>A = C.d\/\u03b50 = 1.1 x 10<sup>2<\/sup> m<sup>2<\/sup><\/i><\/p>\n<p>Essa \u00e1rea extensa \u00e9 te\u00f3rica, na pr\u00e1tica, utiliza-se um material diel\u00e9trico entre as placas para reduzir o espa\u00e7o necess\u00e1rio.<\/p>\n<h2>Capacitores em S\u00e9rie e Paralelo<\/h2>\n<p>Os capacitores podem ser combinados em s\u00e9rie ou em paralelo para alcan\u00e7ar capacit\u00e2ncias desejadas. Em s\u00e9rie, a capacit\u00e2ncia equivalente \u00e9 calculada pela soma dos inversos das capacit\u00e2ncias individuais. Em paralelo, a capacit\u00e2ncia equivalente \u00e9 a soma das capacit\u00e2ncias.<\/p>\n<h2>Energia Armazenada em Capacitores<\/h2>\n<p>Capacitores s\u00e3o usados para armazenar energia el\u00e9trica. A energia potencial el\u00e9trica armazenada em um capacitor carregado \u00e9 igual ao trabalho necess\u00e1rio para carreg\u00e1-lo. Essa energia \u00e9 recuperada quando o capacitor \u00e9 descarregado.<\/p>\n<h2>Valores T\u00edpicos de Capacit\u00e2ncia<\/h2>\n<p>Um farad \u00e9 uma unidade relativamente grande de capacit\u00e2ncia, raramente encontrada em circuitos eletr\u00f4nicos comuns. Subm\u00faltiplos do farad, como o microfarad (\u03bcF) e o picofarad (pF), s\u00e3o mais pr\u00e1ticos. Por exemplo, um pequeno capacitor cer\u00e2mico pode ter uma capacit\u00e2ncia de cerca de 0.1 \u03bcF, enquanto um supercapacitor pode alcan\u00e7ar v\u00e1rios farads.<\/p>\n<h2>Conclus\u00e3o<\/h2>\n<p>Em resumo, o c\u00e1lculo da capacit\u00e2ncia \u00e9 vital para o projeto e a an\u00e1lise de circuitos eletr\u00f4nicos. A compreens\u00e3o das propriedades dos capacitores permite seu uso eficiente em uma variedade de aplica\u00e7\u00f5es, desde a filtragem de sinais at\u00e9 o armazenamento de energia.<\/p>\n<p><img decoding=\"async\" src=\"https:\/\/www.electricity-magnetism.org\/wp-content\/uploads\/2022\/01\/logo.png\" alt=\"\" \/><\/p>\n<div style=\"text-align: center; font-size: 20px;\">\n    <a href=\"https:\/\/www.electricity-magnetism.org\/calculation-of-capacitors\/\">Original Article<\/a>\n<\/div>\n<p>&nbsp;<\/p>\n","protected":false},"excerpt":{"rendered":"<p>A capacit\u00e2ncia de um capacitor pode ser calculada usando a seguinte f\u00f3rmula: C = Q\/V onde C \u00e9 a capacit\u00e2ncia em farads (F).<\/p>\n","protected":false},"author":1,"featured_media":1581,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"_generate-full-width-content":"","footnotes":""},"categories":[14],"tags":[],"class_list":["post-80661","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-nao-categorizado","generate-columns","tablet-grid-50","mobile-grid-100","grid-parent","grid-50"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v17.9 - 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