An electric bulb is rated 220v and 100w when it is operated on 110v calculate the power consumption?
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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.
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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