Heating effect of electric current.
When a P.D. is applied between the two ends of a wire, the free electrons move through the conductor from the negative terminal to the positive terminal. During their motion, the electrons collide with each other and also with the ions in the conductor. These collisions slow down the electrons, thereby resulting in the loss of their kinetic energy. This loss of kinetic energy appears in the form of heat.
Appliances like the geyser, heater, electric iron, electric bulb, Fuse, Electric furnace etc. works on the heating effect of electric current.
