1.

Power consumed in a bulb of 1000W and 220V when connected to 110 V mains = .........

Answer»

750 W
500 W
250 W
1000 W

Solution :250 W
`P_(1) = (V_(1)^(2))/(R) and P_(2) = (V_(2)^(2))/(R)`
`THEREFORE (P_(2))/(P_(1)) = ((V_(2))/(V_(1)))^(2)`
`therefore P_(2) = P_(1) xx ((V_(2))/(V_(1)))^(2) = 1000 xx ((110)/(220))^(2)= (1000)/(4)`
`therefore P_(2) = 250 W `


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