如图所示,电源电压不变,闭合开关S,当滑片P置变阻器的中点时,电流表的示数为3A;当滑片P置于变阻器的b端时,电流变的示数变化了1A,此时R1消耗的电功率为40W.求(1)R1的阻值是多少?(2)电源滑动变
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![如图所示,电源电压不变,闭合开关S,当滑片P置变阻器的中点时,电流表的示数为3A;当滑片P置于变阻器的b端时,电流变的示数变化了1A,此时R1消耗的电功率为40W.求(1)R1的阻值是多少?(2)电源滑动变](/uploads/image/z/7919001-9-1.jpg?t=%E5%A6%82%E5%9B%BE%E6%89%80%E7%A4%BA%2C%E7%94%B5%E6%BA%90%E7%94%B5%E5%8E%8B%E4%B8%8D%E5%8F%98%2C%E9%97%AD%E5%90%88%E5%BC%80%E5%85%B3S%2C%E5%BD%93%E6%BB%91%E7%89%87P%E7%BD%AE%E5%8F%98%E9%98%BB%E5%99%A8%E7%9A%84%E4%B8%AD%E7%82%B9%E6%97%B6%2C%E7%94%B5%E6%B5%81%E8%A1%A8%E7%9A%84%E7%A4%BA%E6%95%B0%E4%B8%BA3A%3B%E5%BD%93%E6%BB%91%E7%89%87P%E7%BD%AE%E4%BA%8E%E5%8F%98%E9%98%BB%E5%99%A8%E7%9A%84b%E7%AB%AF%E6%97%B6%2C%E7%94%B5%E6%B5%81%E5%8F%98%E7%9A%84%E7%A4%BA%E6%95%B0%E5%8F%98%E5%8C%96%E4%BA%861A%2C%E6%AD%A4%E6%97%B6R1%E6%B6%88%E8%80%97%E7%9A%84%E7%94%B5%E5%8A%9F%E7%8E%87%E4%B8%BA40W.%E6%B1%82%281%29R1%E7%9A%84%E9%98%BB%E5%80%BC%E6%98%AF%E5%A4%9A%E5%B0%91%3F%282%29%E7%94%B5%E6%BA%90%E6%BB%91%E5%8A%A8%E5%8F%98)
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