A 100 W incandescent bulb is connected to an ac source that can give 311 V peak voltage supply. The rms current through the bulb is

Correct option is D

Correct answer is D
Explanation:
Given data:
Power, P = 100 W
Peak voltage, Vpeak = 311 V
First, calculate the RMS voltage:
Vrms = Vpeak/√2 = 311/√2 = 311/1.414 ≈ 220 V
Now, calculate the RMS current:
Irms = P/Vrms = 100/220 ≈ 0.454 A
On rounding, Irms ≈ 0.45 A.