Following are the disadvantages of the heating effect of current:
1) When an electric current flows through the conductor, a part of it is converted into heat energy. This is a waste of energy.
2) The heat produced can damage the insulation and other electrical components, or even cause a fire
3) Reduces the life of several components in the circuit
4) An additional cooling system needs to be added to the circuit to counter the heating effect. This adds to the cost.