Physics
Answer
The material used for making fuse wire is an alloy of lead and tin because it's melting point is low and it's specific resistance is more than that of copper or aluminium so that the resistance of a short and thin fuse wire is more than that of the connecting wire. It permits current upto it's safe limit to pass through it, but an excessive current melts it so that it blows off and the circuit is broken.
Related Questions
How does (a) resistance, and (b) specific resistance of a wire depend on it's (i) length, and (ii) radius?
Name a material which is used for making the standard resistor. Give a reason.
What is a superconductor ? Give one example of it.
(a) Name the material used for making connection wires. Give reason for your answer.
(b) Why should a connection wire be thick?