A light bulb is rated 100w for 220v

Asked by admin @ 29/08/2021 in Science viewed by 344 People

A light bulb is rated at 100W for a 220V supply.Find the resistance of the bulb?

Answered by admin @ 29/08/2021

Given that p=100w,v=220v
P=VI
100=220*I
I=100/220=5/11 Ampere.
we know that V=IR (ohms law)
220=5/11R
R=2420/5
R=484 ohm

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