Answer:
Short circuiting: Whenever live and
neutral wires come in contact with each other, the incident is called short
circuiting. In this case, resistance of a circuit decreases to a very
small value. The decreasing of resistance increases the current. Due to this
increased current, the wires get heated. This extreme heat may cause fire in
the building.
Overloading:
Every supply has a capacity to bear a maximum load, i.e., the power that can be
supplied has a limit. Sometimes, the number of appliances which are switched on
at the same time have power more than the capacity of the line. This is called
overloading. In this situation, wires of the supply get heated due to extremely
large current flowing through them and the circuit may catch fire. To avoid
this fire, we use an electric fuse in the circuit.
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