Question

The average power dissipation in pure inductance in AC circuit, is

• A. $1/2L{i}^2$
• B. $2L{i}^2$
• C. $L{i}^2/4$
• D. zero

Answer 1

The correct option is D zero

In pure inductance circuit, $R=0$
Thus power factor of pure inductance circuit $\cos \varphi =\frac{R}{Z}=0$
Average power dissipation $P_{av}=V_{rms}{I}_{rms}\cos \varphi$
$⟹P_{av}=0$