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18. Drive an expression for Joule's law of heating.

Answer»

Work done in carrying a charge Q through a potential difference V is given as

Also, Q = I t

Using Ohm's law, V = IR

W = I2RtThis work done in carrying the charge through the wire appears as the heat produced. i.e.,

H = VIt = I2Rt.

this energy is dissipated as heat energy.

This relationship is also known as Joule's Law of Heating



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