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Exp II - Carga e descarga de um Capacitor.doc

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UNIVERSIDADE FEDERAL SANTA CATARINA Trabalho de Física Experimental II Experiência 6 – Carga e Descarga de Um Capacitor Alunos: Diego Luis Dacroce Pretto Felipe Costa Leite Tiago Joe Tavares Florianópolis, 26 de julho de 2006
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QUESTIONÁRIO 1.a. Faça em uma mesma folha de papel milimetrado os gráficos V C em função de t e V R em função de t com os dados da tabela correspondente ao processo de carga do capacitor. Gráfico em Anexo 1.b. Determine E através destes gráficos, explicando o método. Calcule o erro percentual de E em relação ao valor teórico = RC. Quando t = = RC o capacitor atinge o valor de aproximadamente V C = 0,63 e dessa forma V R = 0,37 , então para t = RC, temos então como valores teóricos: V R = 0,37 . V C = 0,63 . V R = 0,37 . 24,0 V C = 0,63 . 24,0 V R = 8,88 V V C = 15,1 V A partir desses valores teóricos buscamos no gráfico o tempo experimental obtido: t exp (V R ) = e = 31,5 s = RC = 0,000047 x 680000 = 31,96 s t exp (V C ) = e = 37,0 s Assim, temos como erro percentual: % 44 , 1 100 x 96 , 31 96 , 31 5 , 31 100 x E e resistor % % 8 , 15 100 x 96 , 31 96 , 31 0 , 37 100 x E e capacitor % 1.c. Qual é o valor de VR + VC em qualquer instante considerado? Teoricamente o valor V R + V C é constante e igual a  Podemos observar isso somando as equações (2) e (3) do material da professora: RC t R e . V
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