Question

The average power dissipated in A.C. circuit is 2 watt. If a current flowing through a circuit is 2 A and impedance is $1\Omega$, what is the power factor of the AC circuit?

• A. 0.5
• B. 1
• C. 0
• D. $\frac{1}{\sqrt{2}}$

Answer 1

The correct option is A 0.5

Given : $P_{avg}=2$ Watt $I=2$ A $Z=1\Omega$

Thus power factor $\cos \varphi =\frac{P_{avg}}{I^{2}Z}$

$\therefore$ $\cos \varphi =\frac{2}{2^2\times 1}=0.5$