an electric bulb is rated 220 V and 100 Watts. when it is operated on 110 V, the power consumed will be? Calculate using only this formula P=VI
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Answer:Given: P.d=220V
P=100W......
When electric bulb operated on 110V. Then,
Explanation:P=V2/R
R=V2/P
R1=R2
(V1)2/P1=(V2)2/P2
(220)2/100=(110)2/P1
P2=110×110×100/220×220
P2=25W.....ans
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