An electric bulb is rated 220v and 100w
Asked by admin @ in Physics viewed by 302 People
An electric bulb is rated 220V and 100W. When it is operated on 110V, then the power consumed will be ?
Answered by admin @
Hi friend ,
P = V^2/R
If V = 220 V we have
100 W = 220^2/R
R = 220^2/100 Ω = 484 Ω. This is the resistance of the bulb.
When V = 110 V, power consumed = V^2/R = 110^2/484 = 25 W.
So, 25 W power is consumed when it is operated on 110 V.
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