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Q.

If voltage across a bulb rated 220 Volt-100 Watt drops by 2.5% of its rated value, the percentage of the rated value by which the power would decrease is : 

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a

20%

b

2.5% 

c

5% 

d

10%

answer is C.

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Detailed Solution

Resistance of bulb is constant 

P=v2R⇒Δpp=2ΔVv+ΔRR

Δpp=2×2.5+0=5%

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If voltage across a bulb rated 220 Volt-100 Watt drops by 2.5% of its rated value, the percentage of the rated value by which the power would decrease is :