Question

(i)
What is earthing? Why is it necessary to earth the metallic appliances
What is short circuit? Explain.​

Answer 1

In an electrical installation, an earthing system (UK) or grounding system (US) connects specific parts of that installation with the Earth's conductive surface for safety and functional purposes. The point of reference is the Earth's conductive surface.

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Answer 2

Explanation:

In an electrical installation, an earthing system or grounding system connects specific parts of that installation with the Earth's conductive surface for safety and functional purposes. The point of reference is the Earth's conductive surface.

It is necessary to earth metallic appliances , as it protects the user from electric shocks by transferring the current to the earth.

short circuit is an electrical circuit that allows a current to travel along an unintended path with no or very low electrical impedance.