Question

what is the heating effect of electric current find the expression for calculating heat

Answer 1

when current is allowed to pass through a wire of some resistance, it results in some form of energy to get converted into heat energy.
H=K I2(square) RT

Answer 2

If the electric circuit is purely resistive thai is  as configuration of resistors only connected to a battery ,the source of energy continually get dissipated entirely in the form of heat .this is knpwn a s heating effect of electric current.

H=VIt
H=I² Rt