Question

If the resistance in a circuit is 2 ohm and the impedance is 20 ohm, calculate the power factor.

(a) 1/10

(b) 1/20

(c) 1/30

(d) 1/40

The question was asked by my college director while I was bunking the class.

Question is taken from Inductive and Non-Inductive Circuits in division Inductance in a DC Circuit of Basic Electrical Engineering

Answer 1

Right option is (a) 1/10

To explain: We know that:

cos(ϕ)=R/Z = 2/20 = 1/10 ohm.