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What is the power factor of a series RLC circuit under resonance condition?

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in Basic Electrical Engineering by (88.7k points)
What is the power factor of a series RLC circuit under resonance condition?

(a) 0

(b) 1

(c) Infinity

(d) 100

The question was asked in an internship interview.

My question is based upon Frequency Variation in a Series RLC Circuit in chapter Resonance in AC Circuits of Basic Electrical Engineering

1 Answer

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Best answer
Right choice is (b) 1

For explanation: The power factor for a series RLC circuit in resonance condition is always unity because the current is in phase with the voltage under resonance condition.

Φ=0^0 => cos ϕ = 1  i.e.  power factor = 1.

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