In an ac circuit,the power factor | vedclass

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(D) The power factor is defined as $\cos \phi = \frac{R}{Z}$,where $R$ is the resistance and $Z$ is the impedance of the circuit.Case $1$: When the ci

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Both $(b)$ and $(c)$

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(D) The power factor is defined as $\cos \phi = \frac{R}{Z}$,where $R$ is the resistance and $Z$ is the impedance of the circuit.Case $1$: When the circuit contains an ideal resistance only,the impedance $Z = R$.Therefore,the power factor $\cos \phi = \frac{R}{R} = 1$ (unity).Case $2$: When the circuit contains an ideal inductance only,the resistance $R = 0$.Therefore,the power factor $\cos \phi = \frac{0}{Z} = 0$.Since both statements $(b)$ and $(c)$ are correct,the correct option is $(d)$.

In an $ac$ circuit,the power factor

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