Question

A single-pulse transformer with secondary voltage of 230 V, 50 Hz, delivers power to bulb of R = 10 Ω through a half-wave controlled rectifier circuit. For α = 60°, find the average current in the bulb

(a) 2.5 A

(b) 7.7 A

(c) 9.6 A

(d) 3 A

I got this question in exam.

This interesting question is from Single-Phase HW AC-DC-4 topic in division Converters of Power Electronics

Answer 1

Correct choice is (b) 7.7 A

To explain I would say: First find the average voltage, than Io = Vo/R

Vo = (Vm/2π) x (1+cosα).