(a) State joule's Law of heating.
(b) Name two devies where heating effect of current is utilised.
(c) What is the name given to the commercial unit of electircal energy ? Express this unit in joules.

Explanation

(b) In the electric fuse which is a safety device and in the heating elements of electric devices like toaster, electric iron, microwaves, etc.
(c) It is kilowatthour (kwh) 1 kwh =`3.6xx10^(6) ` joules