Question

A sampling watt-meter is used to measure the average power of a load. The peak to peak voltage of the square wave is 10 V and the current is a triangular wave of 5A p-p. The reading in watt will be?

(a) Zero

(b) 25 W

(c) 50 W

(d) 100 W

I got this question during an interview.

My doubt stems from Advanced Miscellaneous Problems on Measurement of Power in chapter Measurement of Power and Related Parameters of Electrical Measurements

Answer 1

Correct option is (a) Zero

Easiest explanation: If we consider both the waves, we can see positive power and negative power in each case are equal. So, the net resultant power is zero.