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(A) The power factor in an $AC$ circuit is defined as the cosine of the phase angle $\phi$ between the voltage and the current. It is given by $\cos \

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Power factor is $\cos \phi$,where $\phi$ is the phase difference between voltage and current.

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(A) The power factor in an $AC$ circuit is defined as the cosine of the phase angle $\phi$ between the voltage and the current. It is given by $\cos \phi = R/Z$,where $R$ is the resistance and $Z$ is the impedance of the circuit.In an $AC$ circuit,the voltage and current are generally not in phase. The relationship is expressed as $V = V_m \sin(\omega t)$ and $I = I_m \sin(\omega t - \phi)$,where $\phi$ represents the phase difference.

What is power factor and voltage-current relationship in an $AC$ circuit?

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