Question
What is the average power given by an ac source to a capacitor?
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Answer
Phase difference between voltage and current in a capacitor $=\phi=90^{\circ}$
Average power $\overline{ P }= E _{ mxx } I _{ rms } \cos \phi=0$$\because \cos 90^{\circ}=0$
Average power $\overline{ P }= E _{ mxx } I _{ rms } \cos \phi=0$$\because \cos 90^{\circ}=0$
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