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Question

(C) Wattless current is defined as the current in an $AC$ circuit for which the average power consumed is zero.Power in an $AC$ circuit is given by $P

Vedclass · Accepted Answer

Only $L$

Vedclass · Answer

(C) Wattless current is defined as the current in an $AC$ circuit for which the average power consumed is zero.Power in an $AC$ circuit is given by $P = V_{rms} I_{rms} \cos \phi$, where $\phi$ is the phase angle between voltage and current.For $P$ to be zero, $\cos \phi$ must be zero, which implies $\phi = 90^{\circ}$.In a purely inductive circuit (Only $L$) or a purely capacitive circuit (Only $C$), the phase difference between voltage and current is $90^{\circ}$.Therefore, in a circuit containing only an ideal inductor (Only $L$) or only an ideal capacitor, the power factor $\cos 90^{\circ} = 0$, resulting in wattless current.Among the given options, Only $L$ is the correct choice.

For obtaining wattless current . . . . . . is connected with ac supply.

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