Question

A chopper circuit is fed from an input voltage of 20 V delivers a power of 16 watts. If the chopper efficiency is 80 %, then find the value of input current.

(a) 0.64 A

(b) 1 A

(c) 0.8 A

(d) 1.25 A

The question was posed to me in an interview.

The above asked question is from Thyristor Chopper Circuits-3 topic in section Choppers of Power Electronics

Answer 1

Right option is (b) 1 A

The best I can explain: 0.8 = ouput/input

Input power = 16/0.8

16/0.8 = V x I

V = 20 V. Hence, I = 1 A.