The wattmeter method is used to measure power in a three-phase load. The wattmeter readings are 400W and -35W. Find the power factor.
(a) 0.43
(b) 0.53
(c) 0.63
(d) 0.73
This question was addressed to me at a job interview.
I'd like to ask this question from Power Measurement in Three-Phase Circuits topic in division Polyphase Circuits of Network Theory