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Jun 24, 2014

An electric bulb is rated 220V and 100W. when it is operated on 110V, what will be the power consumed?

An electric bulb is rated 220V and 100W. when it is operated on 110V, what will be the power consumed?

Syeda

Member since Jan 25, 2017

Answer.     P = V2/R   If V = 220 V we have 100 W = 2202/R R = 2202/100 Ω = 484 Ω. This is the resistance of the bulb. When V = 110 V, power consumed =  V2/R = 1102 /484 = 25 W.

Janhavi Govinda rao

Member since Feb 20, 2013

P = V2/R   If V = 220 V we have 100 W = 2202/R R = 2202/100 Ω = 484 Ω. This is the resistance of the bulb. When V = 110 V, power consumed =  V2/R = 1102 /484 = 25 W.
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