Question

Calculate the active power in an 0 Ω resistor with 0 current flowing through it.

(a) inf MW

(b) 0 MW

(c) 2 MW

(d) 18 MW

This question was posed to me in an international level competition.

My enquiry is from Regenerative Braking of DC Series Motors in chapter Braking of DC Motors & Induction Motors of Electric Drives

Answer 1

Correct choice is (b) 0 MW

The best explanation: The resistor is a linear element. It only absorbs real power and dissipates it in the form of heat. The voltage and current are in the same phase in case of the resistor so the angle between V & I is 0^o. P=I^2R=0×0×0=0 MW.