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 Form 3 Physics: Heating Effect of an Electric Current Questions and Answers

A Current I flowing through a wire of resistance R was increased seven times. Determine the factor by which the power was increased.

 (2m 7s)
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Answer Text:
P=I2R
I=7I
P=(7I)2R
P=49I2R
Power will be 49 times the initial power.


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