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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, then 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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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

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Knowledge Check

  • 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
    0.2
    B
    0.025
    C
    0.05
    D
    0.1

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