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State Joule’s law of heating.

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Joule’s law of heating: According to the Joule’s law of heating, heat (H) produced in a resistor is directly proportional to the:

I. Square of current for a given resistance, 

II. Resistance for a given a current and 

III. The time for which the current flows through the resistor. 

Mathematically, H = i2Rt

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