Question

Write the condition required for a circuit to be a closed circuit.

Answer 1

For an electric circuit to be closed, every part of it must be made of conductors.


A circuit is said to be closed when every part of it is made of a conductor and on plugging in the key or on being complete, current flows through the circuit.
A circuit is said to be open when no current flows through it. It can happen when the key is not plugged in or when any one of its components is not made of a conductor or when the circuit is broken.