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how much will the power of an electric b...

how much will the power of an electric bulb decrease if the current drops by 0.5 % ?

A

`0.25%`

B

`05%`

C

`1%`

D

`2%`

Text Solution

Verified by Experts

The correct Answer is:
C
The resistance of an electric bulb can be assumed to be constant .
power , `P = I^(2)R ,` or , In P = 2 In I+InR
`therefore (DeltaP)/(P)=2(DeltaI)/(I)=2xx0.5%=1%`
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