A single phase 230 V, 1 kW heater is connected across a 1-phase 230 V, 50 Hz supply through an SCR. The firing angle of the SCR is adjusted to give a rms voltage of 155 V. Find the power absorbed by the heater element.

Question

1 Answer

hutan · Answer 1 · 2022-10-07T19:43:53+0000

Right answer is (c) 454 watts

Easiest explanation: R (Heater element resistance) = 230^2/1kW = 52.9 Ω

Now, P = Vrms^2/R = 155^2/52.9.