Question

An alternating voltage V = $V_0 \sin \omega t$ is applied across a circuit. As result $I = I_0 \sin(\omega t - \pi /2)$ flows in it. The power consumed per cycle is

• A. zero
• B. $0.5\, V_0I_0$
• C. $0.707\, V_0I_0$
• D. $1.414\, V_0I_0$

Answer 1

Answer: (A)

zero

Answer 2

The phase angle between voltage $V$ and current $I$ is $\pi / 2$ Power factor as $\cos\, \theta=\cos \frac{\pi}{2}=0$ Hence the power consumed is zero which is choice (a)