If resistance of the filament increases with temperature, what will be power dissipated in a 220 V−100 W lamp when connected to 110 V power supply?
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a
25 W
b
< 25 W
c
> 25 W
d
None of these
answer is C.
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Detailed Solution
If resistance does not vary with temperature, power consumed = VAVR2 × PR = 1102202 × 100=25 W. But in second cases resistance decreases, so consumed power will be more than 25 W.