某定值电阻与滑动变阻器串联在电压不变的电源两端.当滑动变阻器调到最小时,定值电阻消耗的功率为P1.当滑动变阻器的阻值调到某值时,变阻器两端的电压为U,电路消耗的功率为P2,则此时定
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![某定值电阻与滑动变阻器串联在电压不变的电源两端.当滑动变阻器调到最小时,定值电阻消耗的功率为P1.当滑动变阻器的阻值调到某值时,变阻器两端的电压为U,电路消耗的功率为P2,则此时定](/uploads/image/z/3358835-35-5.jpg?t=%E6%9F%90%E5%AE%9A%E5%80%BC%E7%94%B5%E9%98%BB%E4%B8%8E%E6%BB%91%E5%8A%A8%E5%8F%98%E9%98%BB%E5%99%A8%E4%B8%B2%E8%81%94%E5%9C%A8%E7%94%B5%E5%8E%8B%E4%B8%8D%E5%8F%98%E7%9A%84%E7%94%B5%E6%BA%90%E4%B8%A4%E7%AB%AF.%E5%BD%93%E6%BB%91%E5%8A%A8%E5%8F%98%E9%98%BB%E5%99%A8%E8%B0%83%E5%88%B0%E6%9C%80%E5%B0%8F%E6%97%B6%2C%E5%AE%9A%E5%80%BC%E7%94%B5%E9%98%BB%E6%B6%88%E8%80%97%E7%9A%84%E5%8A%9F%E7%8E%87%E4%B8%BAP1.%E5%BD%93%E6%BB%91%E5%8A%A8%E5%8F%98%E9%98%BB%E5%99%A8%E7%9A%84%E9%98%BB%E5%80%BC%E8%B0%83%E5%88%B0%E6%9F%90%E5%80%BC%E6%97%B6%2C%E5%8F%98%E9%98%BB%E5%99%A8%E4%B8%A4%E7%AB%AF%E7%9A%84%E7%94%B5%E5%8E%8B%E4%B8%BAU%2C%E7%94%B5%E8%B7%AF%E6%B6%88%E8%80%97%E7%9A%84%E5%8A%9F%E7%8E%87%E4%B8%BAP2%2C%E5%88%99%E6%AD%A4%E6%97%B6%E5%AE%9A)
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