如图所示,电源的电压不变,当滑动变阻器R'的滑片P在a端时,电流表的示数为0.5A,当滑动变阻器R'的滑片P在b端时,电流表的示数为0.2A,电压表的示数减少了0.6V.求:(1)电源电压.(2)电阻R的值.(3
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![如图所示,电源的电压不变,当滑动变阻器R'的滑片P在a端时,电流表的示数为0.5A,当滑动变阻器R'的滑片P在b端时,电流表的示数为0.2A,电压表的示数减少了0.6V.求:(1)电源电压.(2)电阻R的值.(3](/uploads/image/z/15157025-17-5.jpg?t=%E5%A6%82%E5%9B%BE%E6%89%80%E7%A4%BA%2C%E7%94%B5%E6%BA%90%E7%9A%84%E7%94%B5%E5%8E%8B%E4%B8%8D%E5%8F%98%2C%E5%BD%93%E6%BB%91%E5%8A%A8%E5%8F%98%E9%98%BB%E5%99%A8R%27%E7%9A%84%E6%BB%91%E7%89%87P%E5%9C%A8a%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%BA0.5A%2C%E5%BD%93%E6%BB%91%E5%8A%A8%E5%8F%98%E9%98%BB%E5%99%A8R%27%E7%9A%84%E6%BB%91%E7%89%87P%E5%9C%A8b%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%E7%94%B5%E5%8E%8B%E8%A1%A8%E7%9A%84%E7%A4%BA%E6%95%B0%E5%87%8F%E5%B0%91%E4%BA%860.6V.%E6%B1%82%EF%BC%9A%EF%BC%881%EF%BC%89%E7%94%B5%E6%BA%90%E7%94%B5%E5%8E%8B.%282%29%E7%94%B5%E9%98%BBR%E7%9A%84%E5%80%BC.%EF%BC%883)
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