Question

(a) when does an electric short circuit occur?
(b) what is the use of an earth wire in an elctrical circuit?
(c) why is it necessary to earth metallic appliances?
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Answer 1

(a) when earth wire contact in hot wire .

(b) four save electric appliance to short circuit.

(c) when short circuit occur then total current pass into eart and electric appliance are remain safe.