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AIPMT PRELIMS2012Physics-Electricity

AIPMT PRELIMS 2012 Physics Power in Electric Circuits MCQ Question

Type: MCQ-numerical-Medium-Class 12

If voltage across a bulb rated 220 Vol $t^{-100}$ Watt drops by 2.5% of its rated value, the percentage of the rated value by which the power would decrease is

A

10%

B

20%

C

2.5%

D

5%

Correct Answer

Option D

Detailed Explanation

The power decrease can be calculated using the formula P = V²/R. A 2.5% decrease in voltage results in a 5% decrease in power.

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