Question

What are Joule's laws of heating effect of
current ? How are they experimentally
verified ?​

Answer 1

Answer:

According to Joule's law of heating, the heat produced in a wire is directly proportional to

(1) Square of current (I2)

(2) Resistance of wire (R)

(3) Time (t), for which current is passed. i.e.,

Heat producted,H=I²RT

Experiment

It is also called ohmic heating and resistive heating. In a conductor when an electric field is applied across its ends, the free electrons available in it start drifting opposite to the direction of the electric field. These electrons collide with the atoms which have lost the electrons. As a result of these collisions some energy of the electrons is transferred to the atoms which vibrate violently as they gain energy. Thus, heat is developed in the conductor. Greater the current , greater will be the rate of collision and so greater will be the heat produced. 

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