This question was previously asked in

ESE Electrical 2015 Paper 1: Official Paper

Option 3 : it is the cosine of the angle of phase difference between two equivalent sine waves having respectively r.m.s. values equal to those of the voltage and current in the circuit

CT 1: Basic Concepts

18461

10 Questions
10 Marks
6 Mins

- The term power factor is defined only if the voltage and current waveforms are sinusoidal and have the same frequency.
- Therefore, to find out power in case of non-sinusoidal voltage and current, split them in sinusoidal components. We need to consider their equivalent sine waves.
- The power factor of a circuit in which voltage and current waves are non-sinusoidal is defined as the cosine of the angle of phase difference between two equivalent sine waves having respectively r.m.s. values equal to those of the voltage and current in the circuit.