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:

1. Directly proportional to the square of the current passing through the resistor. H = VIt
2. Directly proportional to the resistance of the resistor. V = IR
3. Directly proportional to the time for which the current passes through the resistor. H = I²Rt.