Joule’s law of Heating

Joule’s law of Heating:

When a current of I amperes passes through a circuit of resistance R ohms for a time of t seconds then the heat produced is given by the relation.

H=I²Rt joules

The above relation is known as the joule’s law of heating. It states that the heat produced is proportional to

1. Square of the current I.
2. Resistance of the circuit R.
3. The time t during which the current flows through the circuit.

Heat produced in calories can be expressed as      

                                   H=I²Rt/4.18 calories                          (1 calorie=4.18 joule)