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Question

For a constant resistance, the correct relation between heat produced (H) and electric current (I) flowing is:


A
HI
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B
HI1
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C
HI2
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D
HI0.5
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Solution

The correct option is C HI2
According to Joule's law, the heat produced in a resistor is;
(i) directly proportional to the square of current for a given resistance.
(ii) directly proportional to resistance for a given current.
(iii) directly proportional to the time for which the current flows through the resistor.
That is H=I2×R×t
Hence HI2 is the right relation.

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