If the length of the filament of a heater is reduced by 10 percent then the power of the heater will be?
In this question please explain why we will not use the formula p=i^2*r instead of p=v^2/r
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Explanation:
Power P=RV2
If length reduced 10% then new resistance of filament will be R′.
R′=R−10% of R
R′=0.9R
Now new power of heater is P2
P2=R′V2=0.9RV2=1.1P
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% increase power=11%
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Answer:
increased power is 11 percentage
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