An electric bulb is rated 220v and 100w when it is opened
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{Q} An electric bulb is rated 220V and 100W. when it is operated on 110V, what will be the power consumed?
{ANS} P = V^2/R If V = 220 V we have
100 W = 2202/RR = 2202/100 Ω = 484 Ω. {This is the resistance of the bulb.}
When V = 110 V, power consumed = V^2/R
=1102 /484
= 25 W.
Hope it helps u.
{ANS} P = V^2/R If V = 220 V we have
100 W = 2202/RR = 2202/100 Ω = 484 Ω. {This is the resistance of the bulb.}
When V = 110 V, power consumed = V^2/R
=1102 /484
= 25 W.
Hope it helps u.
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