如图.R2=30欧.R3=6欧.当S1.S2都闭合时 .电流表的示数为2A .当S1.S2都断开时如图.R2=30欧.R3=6欧.当S1.S2都闭合时 .电流表的示数为2A .当S1.S2都断开时.电流表的示数为0.5A.求(1)电源电压(2)用两种方
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![如图.R2=30欧.R3=6欧.当S1.S2都闭合时 .电流表的示数为2A .当S1.S2都断开时如图.R2=30欧.R3=6欧.当S1.S2都闭合时 .电流表的示数为2A .当S1.S2都断开时.电流表的示数为0.5A.求(1)电源电压(2)用两种方](/uploads/image/z/2077813-37-3.jpg?t=%E5%A6%82%E5%9B%BE.R2%3D30%E6%AC%A7.R3%3D6%E6%AC%A7.%E5%BD%93S1.S2%E9%83%BD%E9%97%AD%E5%90%88%E6%97%B6+.%E7%94%B5%E6%B5%81%E8%A1%A8%E7%9A%84%E7%A4%BA%E6%95%B0%E4%B8%BA2A+.%E5%BD%93S1.S2%E9%83%BD%E6%96%AD%E5%BC%80%E6%97%B6%E5%A6%82%E5%9B%BE.R2%3D30%E6%AC%A7.R3%3D6%E6%AC%A7.%E5%BD%93S1.S2%E9%83%BD%E9%97%AD%E5%90%88%E6%97%B6+.%E7%94%B5%E6%B5%81%E8%A1%A8%E7%9A%84%E7%A4%BA%E6%95%B0%E4%B8%BA2A+.%E5%BD%93S1.S2%E9%83%BD%E6%96%AD%E5%BC%80%E6%97%B6.%E7%94%B5%E6%B5%81%E8%A1%A8%E7%9A%84%E7%A4%BA%E6%95%B0%E4%B8%BA0.5A.%E6%B1%82%EF%BC%881%EF%BC%89%E7%94%B5%E6%BA%90%E7%94%B5%E5%8E%8B%EF%BC%882%EF%BC%89%E7%94%A8%E4%B8%A4%E7%A7%8D%E6%96%B9)
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