既然p=i²r与p=u²r都只适用于纯电阻电路,那为什么计算电动机的�热功率用前者,而且不用后者? 知乎 Template




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tomski既然p=i²r与p=u²r都只适用于纯电阻电路,那为什么计算电动机的�热功率用前者,而且不用后者? 知乎 coloring