Tuesday, October 17, 2017

electric circuits - Difference between $I^2R$ and $V^2/R$ and $VI$ for measuring power $P$


We use $I^2R$ or $V^2/R$ or $VI$ for measuring power $P$. Are all of these applicable for all circuits? I have seen in some circuit $V^2/R$ is not equal to $I^2R$. Why is that?




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