What is the power factor of an ac circuit having resistance R and Inductance L connected in series? (ω is the angular frequency)
Answer & explanation
Correct answer: option 4
Power Factor is $cos\phi = \frac{R}{Z} = \frac{R}{\sqrt{R^2+\omega^2L^2}}$
The correct answer is Option (4) → $R(R^2+ω^2L^2)^{-\frac{1}{2}}$