An electric bulb is rated 220 v and 100 w . When it is operated on110 v what is the power consumed by the bulb
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An electric bulb is rated 220V and 100W. when it is operated on 110V, what will be the power consumed? ... This is the resistance of the bulb. When V = 110 V,power consumed = V2/R = 1102 /484 = 25 W.
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Power , P = 100 W
Potential Diff. , V = 220 V
Resistance = ?
P = V²/R
100 = (220)²/R
R = (220×220)/100
R = 484 Ω
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Power , P = ?
Potential Diff. , V = 110 V
Resistance = 484 Ω
P = V²/R
100 = (110)²/484
R = (110×110)/484
R = 25 Ω
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