如图,R1=20欧,R2=20欧,当开关S1和S2均断开时,电压表的示数为6V,电流表A的示数为0.6A.求(1)电阻R3的阻值和电源电压,(2)当S1,S2均闭合时,电压表V和电流表A示数.(3)当s1和s2均比何时,P2及在1min
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![如图,R1=20欧,R2=20欧,当开关S1和S2均断开时,电压表的示数为6V,电流表A的示数为0.6A.求(1)电阻R3的阻值和电源电压,(2)当S1,S2均闭合时,电压表V和电流表A示数.(3)当s1和s2均比何时,P2及在1min](/uploads/image/z/7919061-69-1.jpg?t=%E5%A6%82%E5%9B%BE%2CR1%3D20%E6%AC%A7%2CR2%3D20%E6%AC%A7%2C%E5%BD%93%E5%BC%80%E5%85%B3S1%E5%92%8CS2%E5%9D%87%E6%96%AD%E5%BC%80%E6%97%B6%2C%E7%94%B5%E5%8E%8B%E8%A1%A8%E7%9A%84%E7%A4%BA%E6%95%B0%E4%B8%BA6V%2C%E7%94%B5%E6%B5%81%E8%A1%A8A%E7%9A%84%E7%A4%BA%E6%95%B0%E4%B8%BA0.6A.%E6%B1%82%EF%BC%881%EF%BC%89%E7%94%B5%E9%98%BBR3%E7%9A%84%E9%98%BB%E5%80%BC%E5%92%8C%E7%94%B5%E6%BA%90%E7%94%B5%E5%8E%8B%2C%EF%BC%882%EF%BC%89%E5%BD%93S1%2CS2%E5%9D%87%E9%97%AD%E5%90%88%E6%97%B6%2C%E7%94%B5%E5%8E%8B%E8%A1%A8V%E5%92%8C%E7%94%B5%E6%B5%81%E8%A1%A8A%E7%A4%BA%E6%95%B0.%EF%BC%883%EF%BC%89%E5%BD%93s1%E5%92%8Cs2%E5%9D%87%E6%AF%94%E4%BD%95%E6%97%B6%2CP2%E5%8F%8A%E5%9C%A81min)
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