Electrical fuse

A fuse is a safety device that breaks an electrical circuit when the current exceeds a safe limit. It contains a thin strip of metal that melts if too much current flows through it, interrupting the circuit. This protects more expensive components from damage and reduces the risk of fire caused by overheating. Without a fuse, electrical appliances could be damaged by excess current. This safety measure is known as sacrificial protection, as the fuse is destroyed to save the rest of the circuit.

What is the primary function of a fuse in an electrical circuit?

• To break the circuit when current is too high

• To store electrical energy

• To convert electrical energy into heat

• To increase the current flow

What happens to the thin strip of metal in a fuse when the current is too high?

• It expands

• It melts

• It solidifies

• It contracts

Why is a fuse considered a form of sacrificial protection?

• It can be reused multiple times

• It is the most expensive component

• It is destroyed to protect the rest of the circuit

• It enhances the circuit's performance

What risk does a fuse help to reduce in an electrical circuit?

• Risk of electrical shock

• Risk of mechanical failure

• Risk of fire caused by overheating

• Risk of water damage

What could happen to an electrical appliance without a fuse?

• It could operate more efficiently

• It could be damaged by excess current

• It could become waterproof

• It could generate more power