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  4. A 60 μ F capacitor is connected to a 110 V (rms), 60 Hz ac supply, the net power absorbed by the circuit in one complete cycle is

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Q. A $60\,\mu F$ capacitor is connected to a $110\,V (rms)$, $60\,Hz$ ac supply, the net power absorbed by the circuit in one complete cycle is

Alternating Current

Solution:

As $P=V_{rms}\,I_{rms}\,I_{rms}\,cos\,\phi$
In a pure capacitance circuit, the phase difference between alternating voltage and current is $\pi /2$. Hence
$P = V_{rms}\,I_{rms}\,cos\,90^° = 0$.