如图所示电路电源,电压U=8V,且保持不变,R1=10Ω,R2=40Ω.试问:(1)若开关S1闭合,S2断开,当滑片P滑到a端时,电流表的示数为0.2A,此时滑动变阻器R的电阻值为多大?电流通过R'1min做功多少J?(2)若开关S
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![如图所示电路电源,电压U=8V,且保持不变,R1=10Ω,R2=40Ω.试问:(1)若开关S1闭合,S2断开,当滑片P滑到a端时,电流表的示数为0.2A,此时滑动变阻器R的电阻值为多大?电流通过R'1min做功多少J?(2)若开关S](/uploads/image/z/3229783-7-3.jpg?t=%E5%A6%82%E5%9B%BE%E6%89%80%E7%A4%BA%E7%94%B5%E8%B7%AF%E7%94%B5%E6%BA%90%2C%E7%94%B5%E5%8E%8BU%3D8V%2C%E4%B8%94%E4%BF%9D%E6%8C%81%E4%B8%8D%E5%8F%98%2CR1%3D10%CE%A9%2CR2%3D40%CE%A9.%E8%AF%95%E9%97%AE%3A%281%29%E8%8B%A5%E5%BC%80%E5%85%B3S1%E9%97%AD%E5%90%88%2CS2%E6%96%AD%E5%BC%80%2C%E5%BD%93%E6%BB%91%E7%89%87P%E6%BB%91%E5%88%B0a%E7%AB%AF%E6%97%B6%2C%E7%94%B5%E6%B5%81%E8%A1%A8%E7%9A%84%E7%A4%BA%E6%95%B0%E4%B8%BA0.2A%2C%E6%AD%A4%E6%97%B6%E6%BB%91%E5%8A%A8%E5%8F%98%E9%98%BB%E5%99%A8R%E7%9A%84%E7%94%B5%E9%98%BB%E5%80%BC%E4%B8%BA%E5%A4%9A%E5%A4%A7%3F%E7%94%B5%E6%B5%81%E9%80%9A%E8%BF%87R%EF%BC%871min%E5%81%9A%E5%8A%9F%E5%A4%9A%E5%B0%91J%3F%EF%BC%882%EF%BC%89%E8%8B%A5%E5%BC%80%E5%85%B3S)
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