欧姆定律的题,有三个电阻如图所示,R2=60欧,R是最大阻值为20欧的滑动变阻器,电源电压U恒定不变.(1)当开关S闭合,P置a端时,电流表A的示数为0.5安,A1的示数为0.3安,求:电源电U的值,R1的电阻值.(2)当
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![欧姆定律的题,有三个电阻如图所示,R2=60欧,R是最大阻值为20欧的滑动变阻器,电源电压U恒定不变.(1)当开关S闭合,P置a端时,电流表A的示数为0.5安,A1的示数为0.3安,求:电源电U的值,R1的电阻值.(2)当](/uploads/image/z/3351604-4-4.jpg?t=%E6%AC%A7%E5%A7%86%E5%AE%9A%E5%BE%8B%E7%9A%84%E9%A2%98%2C%E6%9C%89%E4%B8%89%E4%B8%AA%E7%94%B5%E9%98%BB%E5%A6%82%E5%9B%BE%E6%89%80%E7%A4%BA%2CR2%3D60%E6%AC%A7%2CR%E6%98%AF%E6%9C%80%E5%A4%A7%E9%98%BB%E5%80%BC%E4%B8%BA20%E6%AC%A7%E7%9A%84%E6%BB%91%E5%8A%A8%E5%8F%98%E9%98%BB%E5%99%A8%2C%E7%94%B5%E6%BA%90%E7%94%B5%E5%8E%8BU%E6%81%92%E5%AE%9A%E4%B8%8D%E5%8F%98.%281%29%E5%BD%93%E5%BC%80%E5%85%B3S%E9%97%AD%E5%90%88%2CP%E7%BD%AEa%E7%AB%AF%E6%97%B6%2C%E7%94%B5%E6%B5%81%E8%A1%A8A%E7%9A%84%E7%A4%BA%E6%95%B0%E4%B8%BA0.5%E5%AE%89%2CA1%E7%9A%84%E7%A4%BA%E6%95%B0%E4%B8%BA0.3%E5%AE%89%2C%E6%B1%82%3A%E7%94%B5%E6%BA%90%E7%94%B5U%E7%9A%84%E5%80%BC%2CR1%E7%9A%84%E7%94%B5%E9%98%BB%E5%80%BC.%282%29%E5%BD%93)
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