Question

A light bulb is rated at 100W for 220V supply .Find the rms current through the bulb.

Answer 1

P = 100W
V = 220V
I = ?
SO ,
P = I × V
100= I × 220
I = 220/100
I = 22 / 10
I = 11 / 5
I = 2.2A
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Answer 2

P = 100W

V = 220V

I = ?

P = V× I

100W = 220V × I

I = 100/ 220

I = 10 / 22

I = 2.2

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