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If voltage across a bulb rated 220 V-100...

If voltage across a bulb rated `220 V-100 W` drops by `2.5 %` of its rated value, the percentage of the rated value by which the power would decreases is

A

0.05

B

0.1

C

0.2

D

`2.5%`

Text Solution

Verified by Experts

The correct Answer is:
A
Power `P=(V^(2))/(R )`
For small variation, `(Delta P)/(P)xx100%=(2xxDelta V)/(V)xx100%` therefore power would decrease by 5%
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