Question

Which of the following devices is used to prevent the flow of excess current in a circuit?

• A. Fuse
• B. Switch
• C. Bulb
• D. Battery

Answer 1

The correct option is A

Fuse

Explanation for correct option(s):

Option (A) :

1. Fuse is a safety device that is used to limit the current in an electrical circuit.
2. The fuse wire melts and breaks the electric circuit when there is a supply of large current or malfunctioning in the electric connections.
3. Fuse protects the circuit and other electrical appliances by blocking the excess flow of current.
4. It is made of material that has a low melting point.

Explanation for incorrect option(s):

Option(B):

1. The switch is a simple device used to either break the electric circuit or complete it.

Option(C):

1. Bulb is an electrical device that glows when an electric current passes through it.

Option(D):

1. Battery is an electrochemical device that is used to maintain current in the circuit.

Hence, Option(A) is correct.