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If voltage across a bulb rated 220 volt-...

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

A

`5%`

B

`10%`

C

`20%`

D

`25%`

Text Solution

Verified by Experts

The correct Answer is:
A
`P prop V^(2)` So `(DeltaP)/(P) xx 100 = 2 (Delta V)/( V) xx 100 = 5%`
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Knowledge Check

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