Question

When does an electric short circuit occur?

House fuses play a pivotal role in ensuring the safety and functionality of home electrical infrastructure and appliances. It acts as a protective device which is designed to interrupt the flow of electric currents which can restrict and prevent any overload when a short circuit happens in the house. This is the measure which prevents potential damage which can cause serious accidents or even death So every house has a house fuse, and they are the very essential components of an electrical system. They have a metal wire that is in a protective case. The main function of this is to safeguard by breaking all the circuit if any fault happens in any appliance by the flow of too much current by overloading, and protecting the wire and appliances. This type of fuse is also very helpful in reducing the risk of fire damage and any dangerous incidents that can happen due to an electrical shock.

Explain the meaning of overloading of an electrical circuit. List two possible causes due to which overloading may occur in household circuits. Write one preventive measure that should be taken to avoid overloading of domestic circuits.

Observe the circuit shown below. All the three switches are open. Identify the switch/switches that on being closed will cause the fuse to blow.