Question

In an A.C. circuit, the current flowing is $I=5sin(100 t - \frac{π}{2}) ampere$ and the potential difference is $V = 200 sin (100 t) volts$. The power consumption is equal to

• A. 20 W
• B. 0 W
• C. 1000W
• D. 40 W.

Answer 1

Answer: (B)

0 W

Answer 2

Power, P=Ir.m.s×Vr.m.s×cosϕ
Here, the phase difference between voltage and current is $π/2$.
Hence, P=Ir.m.s×Vr.m.s×cos $π/2$=0