Question
Physics Question on Alternating current
In an A.C. circuit, the current flowing is I=5sin(100t−2π)ampere and the potential difference is V=200sin(100t)volts. The power consumption is equal to
A
20 W
B
0 W
C
1000W
D
40 W.
Answer
0 W
Explanation
Solution
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