A light bulb is rated 200 W for 220 V ac supply of 50 Hz. Calculate(i) – InterviewSolution

1.

A light bulb is rated 200 W for 220 V ac supply of 50 Hz. Calculate(i) the resistance of the bulb;(i) the rms current through the bulb.5.

Answer»

We know that Power = VI

I = V/R

P = V(V/I) = V2/R

R = V2/P = 220 x 220 / 200 = 242 ohm

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2. irms= P / V = 200 /220 = 0.90 amp

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