Question

The below given circuit has Vs = 230V and R = 20 Ω. Find the value of the average output load current at the R load for a firing angle of 45°.

(a) – 0.7585

(b) 0.7585

(c) -0.6396

(d) -0.5

This question was addressed to me by my school principal while I was bunking the class.

I want to ask this question from AC Voltage Controllers-3 topic in section Voltage Controllers of Power Electronics

Answer 1

Right answer is (a) – 0.7585

Explanation: Vo = [(√2 x 230) x (cos45 – 1)]/2π = -15.17 V.

Io = (Vo)/R = -0.7585

Negative value is due to the fact that the average value in the positive half cycle is less than that in the negative half cycle.