Question

State Joule’s law of heating.

Answer 1

The heat produced in the resistor is H = W = VQ
We know that the relation between the charge and current is Q = It.

Using this, we get H = VIt

From Ohm’s Law, V = IR. Hence, we have H = I²Rt
This is known as Joule’s law of heating.

Joule’s law of heating states that the heat produced in any resistor is:

i. Directly proportional to the square of the current passing through the resistor. H = VIt

ii. Directly proportional to the resistance of the resistor. V = IR

iii. Directly proportional to the time for which the current is passing through the resistor. H = I²Rt.