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Q.

The Joule’s law of heating implies that heat produced in a resistor is directly proportional to the [[1]]of the current for a given resistance.


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Detailed Solution

The Joule’s law of heating implies that heat produced in a resistor is directly proportional to the square of the current for a given resistance.
It asserts that the heat generated in a resistor is
(a) linearly proportional to the square of the current, H ∝ I2  ……………….. (i)
(b) For a given current, it is directly proportional to resistance, H ∝ R.   ……………. (ii)
(c) It is proportional to the time that current travels through the conductor, H ∝ t. …………… (iii)
By combining equations (i),(ii) and (iii), we get,
H=I2Rt
  
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