Question

Which of the following is true about power factor?

(a) sin⁡Φ=\(\frac {True \, power}{Apparent \, power}\)

(b) cosΦ=\(\frac {True \, power}{Apparent \, power}\)

(c) sin⁡Φ=\(\frac {Apparent \, power}{True \, power}\)

(d) cosΦ=\(\frac {Apparent \, power}{True \, power}\)

I had been asked this question during an online interview.

My question is from Power in AC Circuit : The Power Factor topic in portion Alternating Current of Physics – Class 12

Answer 1

The correct answer is (b) cosΦ=\(\frac {True \, power}{Apparent \, power}\)

The best I can explain: The power factor of an AC electrical power system is defined as the ratio of the real or true power absorbed by the load to the apparent power flowing in the circuit, and in the closed interval of −1 to 1. The expression for power factor is given as:

cos⁡Φ=\(\frac {True \, power}{Apparent \, power}\)