Question

The commonly used safety fuse wire is made of

• A. copper
• B. lead
• C. nickel
• D. an alloy of tin and lead

Answer 1

The correct option is D

an alloy of tin and lead

1. An electric fuse is a safety device used in electrical circuits.
2. This consists of a wire with a low melting point like an alloy of tin and lead.
3. In case of overflow of current in the circuit, high heat is generated
4. This high heat causes the fuse wire to melt, breaking the circuit.
5. The principle behind the electrical fuse is the heating effect of the electric current.
6. So fuse wires are made up of materials with lower melting points so that as soon as higher currents are passed, it gets heated up and break by melting thus breaking the circuit.
   

Hence, option D is correct. The commonly used wire in the fuse is an alloy of tin and lead.