Question

The electric bulb will glow only when the circuit ______.

• A. Current flows through the circuit
• B. Electric circuit is incomplete
• C. Electric switch is open
• D. All of these

Answer 1

The correct option is A

Current flows through the circuit

A closed circuit is a circuit which complete i.e., every terminal is joined to a device and this continues until the final terminal gets connected back to the first terminal.

An open circuit is a circuit which is incomplete. Here the terminals will be disconnected thus, the flow of current is not complete.

The bulb in a circuit glows only when the circuit is closed and the current is flowing.