Question

A three-phase full converter charges a battery from a three-phase supply of 230 V. The battery emf is 200 V and the internal resistance of the battery is 0.5 Ω. Find the value of the continuous current which is flowing through the battery if its terminal voltage is 210 V

(a) 10 A

(b) 20 A

(c) 0.5 A

(d) 25 A

This question was posed to me during an interview for a job.

The origin of the question is Three Phase Converters-2 topic in section Converters of Power Electronics

Answer 1

Correct choice is (b) 20 A

The best explanation: Vo = 210 V

Vo = E + Io x R

210 = 200 + 0.5 x Io

Io (Current through the battery)  = 20 A.