{"id":1844,"date":"2016-01-25T00:55:47","date_gmt":"2016-01-25T00:55:47","guid":{"rendered":"http:\/\/fisicaevestibular.com.br\/novo\/?page_id=1844"},"modified":"2024-08-19T12:15:42","modified_gmt":"2024-08-19T12:15:42","slug":"aparelhos-de-medicao-eletrica-amperimetros-e-voltimetros","status":"publish","type":"page","link":"https:\/\/fisicaevestibular.com.br\/novo\/eletricidade\/eletrodinamica\/aparelhos-de-medicao-eletrica-amperimetros-e-voltimetros\/","title":{"rendered":"Amper\u00edmetros e Volt\u00edmetros – Aparelhos de medi\u00e7\u00e3o el\u00e9trica"},"content":{"rendered":"

Aparelhos de medi\u00e7\u00e3o el\u00e9trica \u2013 Amper\u00edmetros e Volt\u00edmetros<\/b><\/span><\/span><\/span><\/p>\n

\u00a0<\/span><\/p>\n

Amper\u00edmetros<\/b><\/span><\/span><\/span><\/p>\n

\u00a0<\/span><\/p>\n

Amper\u00edmetro<\/b><\/span><\/span><\/span> \u00e9 <\/b><\/span><\/span><\/span>um instrumento que mede a intensidade de corrente el\u00e9trica.<\/b><\/span><\/span><\/span> Alguns <\/b><\/span><\/span><\/span>amper\u00edmetros<\/b><\/span><\/span><\/span><\/p>\n

\"\"<\/p>\n

indicam <\/b><\/span><\/span><\/span>tamb\u00e9m, al\u00e9m intensidade da corrente, seu sentido que , quando a indica\u00e7\u00e3o for positiva ela circula no sentido hor\u00e1rio e negativa, no sentido anti hor\u00e1rio.<\/b><\/span><\/span><\/span><\/p>\n

\"\"<\/p>\n

\"\"<\/p>\n

\"\"<\/p>\n

\u00a0Como o <\/b><\/span><\/span><\/span>amper\u00edmetro indica a corrente que passa por ele no trecho do circuito onde ele est\u00e1<\/b><\/span><\/span><\/span> <\/b>inserido,<\/b><\/span><\/span><\/span> sua <\/b><\/span><\/span><\/span>resist\u00eancia interna deve ser nula<\/b><\/span><\/span><\/span>, caso contr\u00e1rio ele<\/b><\/span><\/span><\/span>indicaria uma corrente<\/b><\/span><\/span><\/span> de <\/b><\/span><\/span><\/span>intensidade menor que aquela que realmente passa pelo trecho.<\/b><\/span><\/span><\/span><\/b><\/p>\n

Ent\u00e3o ele deve se <\/b><\/span><\/span><\/span>comportar como um fio ideal,<\/b><\/span><\/span><\/span> de <\/b><\/span><\/span><\/span>resist\u00eancia interna nula<\/b><\/span><\/span><\/span>, ou seja, deve se comportar como se <\/b><\/span><\/span><\/span>estivesse em curto circuito.<\/b><\/span><\/span><\/span><\/p>\n

Um amper\u00edmetro ideal deve possuir resist\u00eancia interna nula.<\/b><\/span><\/span><\/span><\/p>\n

Volt\u00edmetro<\/b><\/span><\/span><\/span><\/p>\n

Volt\u00edmetro<\/b><\/span><\/span><\/span> \u00e9 um\u00a0<\/b><\/span><\/span><\/span>instrumento que mede a diferen\u00e7a de potencial (ddp), tens\u00e3o ou voltagem.<\/b><\/span><\/span><\/span><\/p>\n

\"Amper\u00edmetros\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 \u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0<\/span><\/p>\n

\"\"<\/p>\n

\"\"<\/p>\n

\"Amper\u00edmetros<\/p>\n

Para que a <\/b><\/span><\/span><\/span>corrente que passa pelo aparelho cuja ddp se deseja medir n\u00e3o se desvie para o<\/b><\/span><\/span><\/span> <\/b>volt\u00edmetro,<\/b><\/span><\/span><\/span> um <\/b><\/span><\/span><\/span>volt\u00edmetro ideal<\/b><\/span><\/span><\/span> deve possuir resist\u00eancia interna extremamente alta<\/b><\/span><\/span><\/span>, tendendo ao <\/b><\/span><\/span><\/span>infinito<\/b><\/span><\/span><\/span>.<\/b><\/span><\/span><\/span><\/p>\n

Um volt\u00edmetro ideal deve possuir resist\u00eancia interna infinita.\u00a0<\/b><\/span><\/span><\/span><\/p>\n

\u00a0<\/span>Suponha que voc\u00ea <\/b><\/span><\/span><\/span>deseja medir a corrente que passa pelo ponto B<\/b><\/span><\/span><\/span> e a diferen\u00e7a <\/b><\/span><\/span><\/span>de potencial entre os pontos C e D, da figura, dispondo de volt\u00edmetro e amper\u00edmetro, ambos ideais.<\/b><\/span><\/span><\/span><\/p>\n

\"\"<\/p>\n

Para isso, voc\u00ea deve <\/b><\/span><\/span><\/span>abrir o circuito em B e inserir a\u00ed o <\/b><\/span><\/span><\/span>amper\u00edmetro,<\/b><\/span><\/span><\/span> pois ele <\/b><\/span><\/span><\/span>deve ficar em s\u00e9rie<\/b><\/span><\/span><\/span> com o <\/b><\/span><\/span><\/span>trecho percorrido por i<\/b><\/span><\/span><\/span>B<\/b><\/span><\/span><\/sub><\/span>, de modo que <\/b><\/span><\/span><\/span>i<\/b><\/span><\/span><\/span>B<\/b><\/span><\/span><\/sub><\/span>\u00a0passe por ele.<\/b><\/span><\/span><\/span><\/b><\/p>\n

Os <\/b><\/span><\/span><\/span>terminais do volt\u00edmetro devem ser ligados aos pontos C e D de modo que o <\/b><\/span><\/span><\/span>volt\u00edmetro<\/b><\/span><\/span><\/span> fique em<\/b><\/span><\/span><\/span> <\/b>paralelo <\/b><\/span><\/span><\/span>com o trecho entre C e D, onde voc\u00ea quer medir a ddp.<\/b><\/span><\/span><\/span><\/p>\n

Observe que a <\/b><\/span><\/span><\/span>resist\u00eancia interna do amper\u00edmetro ideal dever ser nula<\/b><\/span><\/span><\/span> de modo que <\/b><\/span><\/span><\/span>toda i<\/b><\/span><\/span><\/span>B <\/b><\/span><\/span><\/sub><\/span>passe por<\/b><\/span><\/span><\/span> <\/b>ele <\/b><\/span><\/span><\/span>e que a <\/b><\/span><\/span><\/span>resist\u00eancia interna do volt\u00edmetro deve ser infinita de modo que i<\/b><\/span><\/span><\/span>CD <\/b><\/span><\/span><\/sub><\/span>n\u00e3o desvie para ele.<\/b><\/span><\/span><\/span><\/p>\n

O que voc\u00ea deve saber, informa\u00e7\u00f5es e dicas<\/b><\/span><\/span><\/span><\/p>\n

Amper\u00edmetro<\/b><\/span><\/span><\/span> \"\" <\/b><\/span><\/span><\/span>instrumento<\/b><\/span><\/span><\/span> que mede <\/b><\/span><\/span><\/span>intensidade de corrente el\u00e9trica.<\/b><\/span><\/span><\/span><\/p>\n

O <\/b><\/span><\/span><\/span>amper\u00edmetro<\/b><\/span><\/span><\/span> deve ser ligado em <\/b><\/span><\/span><\/span>s\u00e9rie<\/b><\/span><\/span><\/span> no trecho onde se deseja medir a corrente el\u00e9trica.<\/b><\/span><\/span><\/span><\/p>\n

\"\"<\/p>\n

Um<\/b><\/span><\/span><\/span> <\/b>amper\u00edmetro ideal<\/b><\/span><\/span><\/span> <\/b>deve possuir<\/b><\/span><\/span><\/span> resist\u00eancia interna nula.<\/b><\/span><\/span><\/span><\/p>\n

\"\" Volt\u00edmetro \"\" instrumento <\/b><\/span><\/span><\/span>que mede<\/b><\/span><\/span><\/span> diferen\u00e7a de potencial, tens\u00e3o ou voltagem.<\/b><\/span><\/span><\/span><\/p>\n

O <\/b><\/span><\/span><\/span>volt\u00edmetro<\/b><\/span><\/span><\/span> deve ser ligado em <\/b><\/span><\/span><\/span>paralelo<\/b><\/span><\/span><\/span> com o aparelho ou trecho cuja diferen\u00e7a de potencial ou tens\u00e3o se deseja medir.<\/b><\/span><\/span><\/span><\/p>\n

\"\"<\/p>\n

Um <\/b><\/span><\/span><\/span>volt\u00edmetro ideal<\/b><\/span><\/span><\/span> deve possuir resist\u00eancia interna infinita.<\/b><\/span><\/span><\/span><\/p>\n

\u00a0<\/span>M\u00e9todo para resolver circuitos com amper\u00edmetros e volt\u00edmetros ideais.<\/b><\/span><\/span><\/span><\/p>\n

Exemplo que deve ser analisado com aten\u00e7\u00e3o:<\/b><\/span><\/span><\/span><\/p>\n

No <\/b><\/span><\/span><\/span>circuito abaixo,<\/b><\/span><\/span><\/span> determine as <\/b><\/span><\/span><\/span>indica\u00e7\u00f5es dos amper\u00edmetros e volt\u00edmetros supostos ideais.<\/b><\/span><\/span><\/span><\/p>\n

\"Amper\u00edmetros<\/p>\n

Etapas:<\/b><\/span><\/span><\/span><\/p>\n

1<\/b><\/span><\/span><\/span>a<\/b><\/span><\/span><\/sup><\/span>\u00a0<\/b><\/span><\/span><\/sub><\/span> \"\" <\/b><\/span><\/span><\/span>Verifique<\/b><\/span><\/span><\/span> se os <\/b><\/span><\/span><\/span>dispositivos est\u00e3o ligados corretamente, ou seja, os amper\u00edmetros associados em s\u00e9rie e os volt\u00edmetros em paralelo.<\/b><\/span><\/span><\/span><\/p>\n

Sim ,<\/b><\/span><\/span><\/span> est\u00e3o.<\/b><\/span><\/span><\/span><\/p>\n

2<\/b><\/span><\/span><\/span>a<\/b><\/span><\/span><\/sup><\/span>\u00a0<\/b><\/span><\/span><\/span> \"\" Como os <\/b><\/span><\/span><\/span>aparelhos s\u00e3o ideais, eles n\u00e3o afetam o circuito<\/b><\/span><\/span><\/span> e, ent\u00e3o voc\u00ea deve <\/b><\/span><\/span><\/span>retirar os<\/b><\/span><\/span><\/span> <\/b>amper\u00edmetros colocando fios ideais no lugar deles<\/b><\/span><\/span><\/span>, e <\/b><\/span><\/span><\/span>retirar os volt\u00edmetros, esquematizando novamente o circuito. E resolvendo conforme a seq\u00fc\u00eancia abaixo:<\/b><\/span><\/span><\/span><\/p>\n

\"Amper\u00edmetrosVoltando:<\/b><\/span><\/span><\/span><\/p>\n

\"\"<\/p>\n

Observe atentamente<\/b><\/span><\/span><\/span> a <\/b><\/span><\/span><\/span>figura abaixo<\/b><\/span><\/span><\/span> e veja <\/b><\/span><\/span><\/span>onde <\/b><\/span><\/span><\/span>est\u00e3o <\/b><\/span><\/span><\/span>inseridos os amper\u00edmetros e volt\u00edmetros, cujas indica\u00e7\u00f5es ser\u00e3o:<\/b><\/span><\/span><\/span><\/p>\n

\"\"<\/p>\n

\"\" Se voc\u00ea quiser <\/b><\/span><\/span><\/span>dominar o assunto \u00e9 preciso resolver muitos exerc\u00edcios,<\/b><\/span><\/span><\/span> mas eu separei <\/b><\/span><\/span><\/span>alguns que pode ajud\u00e1-los e verificar com aten\u00e7\u00e3o as resolu\u00e7\u00f5es comentadas<\/b><\/span><\/span><\/span>. S\u00e3o: <\/b><\/span><\/span><\/span>06, 10, 14, 24, 27 e 35.<\/b><\/span><\/span><\/span><\/p>\n

Confira os exerc\u00edcios sugeridos!<\/span><\/a><\/h3>\n

Clique aqui para ver sobre o tema!<\/a><\/p>\n

Confira as v\u00eddeo aulas!<\/a><\/p>\n","protected":false},"excerpt":{"rendered":"

Aparelhos de medi\u00e7\u00e3o el\u00e9trica \u2013 Amper\u00edmetros e Volt\u00edmetros \u00a0 Amper\u00edmetros \u00a0 Amper\u00edmetro \u00e9 um instrumento que mede a intensidade de corrente el\u00e9trica. Alguns amper\u00edmetros indicam tamb\u00e9m, al\u00e9m intensidade da corrente, seu sentido que , quando a indica\u00e7\u00e3o for positiva ela circula no sentido hor\u00e1rio e negativa, no sentido anti hor\u00e1rio. \u00a0Como o amper\u00edmetro indica a corrente que passa por ele<\/p>\n","protected":false},"author":1,"featured_media":0,"parent":1676,"menu_order":0,"comment_status":"closed","ping_status":"closed","template":"","meta":{"om_disable_all_campaigns":false,"_monsterinsights_skip_tracking":false,"_monsterinsights_sitenote_active":false,"_monsterinsights_sitenote_note":"","_monsterinsights_sitenote_category":0,"footnotes":""},"class_list":["post-1844","page","type-page","status-publish","hentry"],"aioseo_notices":[],"_links":{"self":[{"href":"https:\/\/fisicaevestibular.com.br\/novo\/wp-json\/wp\/v2\/pages\/1844","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/fisicaevestibular.com.br\/novo\/wp-json\/wp\/v2\/pages"}],"about":[{"href":"https:\/\/fisicaevestibular.com.br\/novo\/wp-json\/wp\/v2\/types\/page"}],"author":[{"embeddable":true,"href":"https:\/\/fisicaevestibular.com.br\/novo\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/fisicaevestibular.com.br\/novo\/wp-json\/wp\/v2\/comments?post=1844"}],"version-history":[{"count":6,"href":"https:\/\/fisicaevestibular.com.br\/novo\/wp-json\/wp\/v2\/pages\/1844\/revisions"}],"predecessor-version":[{"id":10496,"href":"https:\/\/fisicaevestibular.com.br\/novo\/wp-json\/wp\/v2\/pages\/1844\/revisions\/10496"}],"up":[{"embeddable":true,"href":"https:\/\/fisicaevestibular.com.br\/novo\/wp-json\/wp\/v2\/pages\/1676"}],"wp:attachment":[{"href":"https:\/\/fisicaevestibular.com.br\/novo\/wp-json\/wp\/v2\/media?parent=1844"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}