Joule’s Law of Heating

The heat that is generated because of the current flow in an electric wire is described in Joules. The mathematical expression of Joule’s law is as explained below.

Joule’s first law

The joule’s first law shows the relationship between heat produced by a flowing electric current through a conductor.

Q = I2 R T

Where,

Q indicates the amount of heatI show electric currentR is the amount of electric resistance in the conductorT denotes timeThe amount of generated heat is proportional to wire’s electrical resistance when the current in the circuit and the flow of current is not changed.The amount of generated heat in a conductor carrying current is proportional to the square of the current flow through the circuit when the electrical resistance and current supply is constant.The amount of heat produced because of the current flow is proportional to the time of flow when the resistance and current flow is kept constant.

Joules heating law is also known as resistive, resistance or Ohmic heating. It is the process by which passage of electric current through a conductor produces heat.