Question

What is heating effect of electric current? State joules law for the heating effect of
electric current. Give its mathematical form. An electric iron consumes energy at a rate
of 840W when heating is at the maximum rate and 360W when heating is at the
minimum. The voltage is 220V. What are the current and resistances in each case.​

Answer 1

Answer:

(i) When an electric current passes through a conductor (like a high resistance wire) the conductor becomes hot after some time and produces heat. This is called heating effect of Electric Current

(ii)The amount of heat produced in a conductor due to the flow of electric current through it is directly proportional to the resistance offered by the conductor when the time of flow and the magnitude of the current is constant.

According to the Joule's law, when a current is passed through a conductor for a certain time, the conductor gets heated up and the amount of heat is given by :

H=$I^{2} RT$  

H is the heat, i is the  R is the resistance and t is time