Question

Calculate the heat loss in the electric motor for time interval 0-5 sec using the following data: Ia=2 A, Ra=.8Ω.

(a) 16 J-sec

(b) 14 J-sec

(c) 12 J-sec

(d) 10 J-sec

I have been asked this question by my college professor while I was bunking the class.

This question is from Motors Rating and Heating topic in chapter Rating and Heating of Motors of Electric Drives

Answer 1

The correct answer is (a) 16 J-sec

To explain: The heat loss can be calculated using the Joule law of heating effect. The value of the heat loss is Ia^2×Ra×t=4×4=16 J-sec.