SOLUTION

Closed circuit:- A closed circuit is defined as a circuit in which the current has a complete path to flow. When the current path is broken so that current cannot flow, the circuit is called an open circuit.

If there is no break anywhere in the circuit, it is called a closed circuit or complete circuit. Current flows easily in a closed circuit. For example, when a torch is switched on, the circuit becomes closed. Current flows in the circuit and the torch glows.