is a measure of how efficiently electrical power is converted into useful work output.
Step-by-step explanation:Power factor correction is the process of compensating for the lagging current by creating a leading current by connecting capacitors to the supply. A sufficient capacitance is connected so that the power factor is adjusted to be as close to unity as possible.
you said it was in the question
the answer is b. 60. each interior angle in 120, so the exterior angle must be 60 in order to add up to 180