What is heating effect of electric current? What is its origin?

Explanation

The production of heat in a resistance due to the electric current flowing through it when it is connected in an electrical circuit, is called the heating effect of electric current.
When a potential difference is applied across a metallic conductor, free electrons in the conductor move from the end at the lower potential to the end at the higher potential giving rise to electric current. These electrons collide with the atoms and positive ions and transfer some kinetic energy to them. This energy is converted into heat. Hence, the temnperature of the conductor begins to rise i.e., the conductor becomes hot. This is the origin of the heating effect of electric current.