Question

A light bulb is rated 100W for 220V ac supply of 50Hz calculate
$(1)the \: reistance \: of \: the \: bulb \: \\ (2)the \: rms \: current \: through \: the \: resistor$
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Answer 1

Explanation:

1) Power = 100W

voltage = 220V

•°• R= V²/p

R= 220×220/100

R= 484 Ω

2) Current =?

V= 220

P= 100

•°• I = p/V

I= 0.45 A