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If the power factor is 1/10 and the value of impedance is 20 ohm, calculate the resistance in the circuit.

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If the power factor is 1/10 and the value of impedance is 20 ohm, calculate the resistance in the circuit.

(a) 1 ohm

(b) 2 ohm

(c) 3 ohm

(d) 4 ohm

I have been asked this question in an interview.

My question is based upon Inductive and Non-Inductive Circuits topic in portion Inductance in a DC Circuit of Basic Electrical Engineering

1 Answer

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The correct choice is (b) 2 ohm

To explain I would say: We know that:

cos(ϕ)=R/Z

R=Z cos(ϕ) = 20/10 = 2 ohm.

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