{"id":80464,"date":"2024-01-14T13:05:41","date_gmt":"2024-01-14T13:05:41","guid":{"rendered":"https:\/\/www.electricity-magnetism.org\/voltimetro-de-bobina-movel-de-ima-permanente-pmmc\/"},"modified":"2024-01-20T09:48:22","modified_gmt":"2024-01-20T09:48:22","slug":"voltimetro-de-bobina-movel-de-ima-permanente-pmmc","status":"publish","type":"post","link":"https:\/\/www.electricity-magnetism.org\/pt-br\/voltimetro-de-bobina-movel-de-ima-permanente-pmmc\/","title":{"rendered":"Volt\u00edmetro de bobina m\u00f3vel de \u00edm\u00e3 permanente – PMMC"},"content":{"rendered":"

O Volt\u00edmetro de Bobina M\u00f3vel com \u00cdm\u00e3 Permanente – PMMC<\/h2>\n

O Volt\u00edmetro de Bobina M\u00f3vel com \u00cdm\u00e3 Permanente (PMMC), tamb\u00e9m conhecido como medidor D’Arsonval ou galvan\u00f4metro, \u00e9 um instrumento crucial na medi\u00e7\u00e3o de corrente el\u00e9trica. Seu funcionamento baseia-se na deflex\u00e3o angular de uma bobina em um campo magn\u00e9tico uniforme, um m\u00e9todo eficiente para determinar a corrente que flui atrav\u00e9s da bobina.<\/p>\n

Princ\u00edpio de Funcionamento<\/h2>\n

O PMMC coloca uma bobina de fio, ou seja, um condutor, entre dois \u00edm\u00e3s permanentes, criando um campo magn\u00e9tico estacion\u00e1rio. De acordo com as Leis de Faraday sobre indu\u00e7\u00e3o eletromagn\u00e9tica, um condutor com corrente em um campo magn\u00e9tico experimentar\u00e1 uma for\u00e7a na dire\u00e7\u00e3o determinada pela regra da m\u00e3o esquerda de Fleming. Esta caracter\u00edstica \u00e9 o que permite a medi\u00e7\u00e3o precisa da corrente.<\/p>\n

Vantagens e Limita\u00e7\u00f5es<\/h2>\n

O PMMC \u00e9 not\u00e1vel por sua escala linear, baixo consumo de energia e alta precis\u00e3o, tornando-o o instrumento mais acurado para medi\u00e7\u00f5es em corrente cont\u00ednua (DC). Contudo, ele n\u00e3o \u00e9 adequado para correntes alternadas (AC). Se uma fonte de AC for conectada a um instrumento PMMC, um torque alternado ser\u00e1 desenvolvido, impedindo sua correta opera\u00e7\u00e3o. Al\u00e9m disso, o custo desses instrumentos \u00e9 geralmente mais alto do que os instrumentos de ferro m\u00f3vel.<\/p>\n

Compara\u00e7\u00e3o com Outros Volt\u00edmetros<\/h2>\n

Existem diferentes tipos de vol\u00edmetros, como:<\/p>\n

Volt\u00edmetro de Ferro M\u00f3vel
\nVolt\u00edmetro Digital (DVM)
\nElectrodinam\u00f4metro
\nVolt\u00edmetro de Retificador
\nVolt\u00edmetro de Indu\u00e7\u00e3o
\nVolt\u00edmetro Eletrost\u00e1tico
\nCada um destes possui caracter\u00edsticas e aplica\u00e7\u00f5es espec\u00edficas, diferenciando-se do PMMC em aspectos como precis\u00e3o, custo e adequa\u00e7\u00e3o para diferentes tipos de correntes.<\/p>\n

S\u00edmbolo e Caracter\u00edsticas do Volt\u00edmetro<\/h2>\n

Em diagramas de circuito, o vol\u00edmetro \u00e9 representado pela letra V em um c\u00edrculo, com duas linhas emergentes representando os pontos de medi\u00e7\u00e3o.<\/p>\n

Analogia Hidr\u00e1ulica do Volt\u00edmetro<\/h2>\n

A analogia hidr\u00e1ulica, ou analogia fluido-el\u00e9trica, \u00e9 uma ferramenta \u00fatil para ensinar e entender como os circuitos funcionam, comparando componentes eletr\u00f4nicos com equivalentes hidr\u00e1ulicos. Nesta analogia, a voltagem \u00e9 comparada \u00e0 diferen\u00e7a de press\u00e3o que empurra a \u00e1gua atrav\u00e9s de uma mangueira, sendo medida em volts (V). Esta modelo assume que a \u00e1gua flui horizontalmente, ignorando a for\u00e7a da gravidade, fazendo do vol\u00edmetro um equivalente \u00e0 medi\u00e7\u00e3o da diferen\u00e7a de press\u00e3o.<\/p>\n

A compreens\u00e3o da eletricidade como um tipo de fluido e a nomea\u00e7\u00e3o de quantidades el\u00e9tricas s\u00e3o derivadas de equivalentes hidr\u00e1ulicos. A rela\u00e7\u00e3o entre voltagem e corrente em dispositivos \u00f4hmicos, como resistores, \u00e9 definida pela Lei de Ohm, an\u00e1loga \u00e0 equa\u00e7\u00e3o de Hagen-Poiseuille, que relaciona fluxo e potencial em seus respectivos sistemas.<\/p>\n

\"\"<\/p>\n

\n Original Article<\/a>\n<\/div>\n

 <\/p>\n","protected":false},"excerpt":{"rendered":"

Volt\u00edmetro de bobina m\u00f3vel de \u00edm\u00e3 permanente – PMMC tamb\u00e9m \u00e9 conhecido como medidor D’Arsonval ou galvan\u00f4metro e \u00e9 usado para determinar a deflex\u00e3o angular em um campo magn\u00e9tico uniforme para determinar a corrente que flui atrav\u00e9s da bobina.<\/p>\n","protected":false},"author":1,"featured_media":2845,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"_generate-full-width-content":"","footnotes":""},"categories":[14],"tags":[],"class_list":["post-80464","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":"\nVolt\u00edmetro de bobina m\u00f3vel de \u00edm\u00e3 permanente - PMMC<\/title>\n<meta name=\"description\" content=\"Volt\u00edmetro de bobina m\u00f3vel de \u00edm\u00e3 permanente - PMMC tamb\u00e9m \u00e9 conhecido como medidor D'Arsonval ou galvan\u00f4metro e \u00e9 usado para determinar a deflex\u00e3o angular em um campo magn\u00e9tico uniforme para determinar a corrente que flui atrav\u00e9s da bobina.\" \/>\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.electricity-magnetism.org\/pt-br\/voltimetro-de-bobina-movel-de-ima-permanente-pmmc\/\" \/>\n<meta property=\"og:locale\" content=\"pt_BR\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Volt\u00edmetro de bobina m\u00f3vel de \u00edm\u00e3 permanente - 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