When current flows through a conductor, heat energy is generated in the conductor.The heating effect depends on the resistance,the time t for which the current flows and the amount of current I .H=I^2Rt. This is the Joules equation of electrical heating.
When you switch on a filament bulb you may experience the heat produced by it , this is the heating effect of that bulb .. Like that when electric current pass through a conductor it produce heat đź‘Ť