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(a) State joule's Law of heating. (b) ...

(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.

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(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
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