Question

The impedance of a series circuit consists of $3\Omega$ resistance and $4\Omega$ reactance. The power factor of the circuit is

• A. $0.4$
• B. $0.6$
• C. $0.8$
• D. $1.0$

Answer 1

The correct option is B $0.6$

Total impedence of circuit $Z=\sqrt{R^2+X^2}R=3\Omega X=4\Omega Z=\sqrt{3^2+4^2}=5\Omega Powerfactor=cos\varnothing =\frac{R}{Z}=\frac{3}{5}=0.6$