What is meant by short circuit ?

Explanation

(i) When a live wire comes in contact with a neutral wire, it causes a . short circuit..
(ii) This happens when the insulation of the wires get damaged due to temperature changes or some external force.
(iii) Due to a short circuit, the effective resistance in the circuit becomes very small, which leads to the flow of a large current through the wires.
(iv) This result in heating of wires to such an extent that a fire may be caused in the building.