定值电阻R1、R2和滑动变阻器R3接入如图电路路中,电源电压不变.当开关S1闭合,S2断开,R3滑片P位于b端时,电压表V1和V2的示数之比U1:U2=1:2,电流表的示数I1=1A;当开关S1和S2都断开,R3滑片P位于a
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![定值电阻R1、R2和滑动变阻器R3接入如图电路路中,电源电压不变.当开关S1闭合,S2断开,R3滑片P位于b端时,电压表V1和V2的示数之比U1:U2=1:2,电流表的示数I1=1A;当开关S1和S2都断开,R3滑片P位于a](/uploads/image/z/2232869-5-9.jpg?t=%E5%AE%9A%E5%80%BC%E7%94%B5%E9%98%BBR1%E3%80%81R2%E5%92%8C%E6%BB%91%E5%8A%A8%E5%8F%98%E9%98%BB%E5%99%A8R3%E6%8E%A5%E5%85%A5%E5%A6%82%E5%9B%BE%E7%94%B5%E8%B7%AF%E8%B7%AF%E4%B8%AD%2C%E7%94%B5%E6%BA%90%E7%94%B5%E5%8E%8B%E4%B8%8D%E5%8F%98%EF%BC%8E%E5%BD%93%E5%BC%80%E5%85%B3S1%E9%97%AD%E5%90%88%2CS2%E6%96%AD%E5%BC%80%2CR3%E6%BB%91%E7%89%87P%E4%BD%8D%E4%BA%8Eb%E7%AB%AF%E6%97%B6%2C%E7%94%B5%E5%8E%8B%E8%A1%A8V1%E5%92%8CV2%E7%9A%84%E7%A4%BA%E6%95%B0%E4%B9%8B%E6%AF%94U1%EF%BC%9AU2%3D1%EF%BC%9A2%2C%E7%94%B5%E6%B5%81%E8%A1%A8%E7%9A%84%E7%A4%BA%E6%95%B0I1%3D1A%EF%BC%9B%E5%BD%93%E5%BC%80%E5%85%B3S1%E5%92%8CS2%E9%83%BD%E6%96%AD%E5%BC%80%2CR3%E6%BB%91%E7%89%87P%E4%BD%8D%E4%BA%8Ea)
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