Question

what is an fuse and how does it work?

Answer 1

A fuse is exactly the same. It's a thin piece of wire designed to carry a limited electrical current. If you try to pass a higher current through the wire, it'll heat up so much that it burns or melts. When it melts, it breaks the circuit it's fitted to and stops the current flowing.

Answer 2

A fuse is a safety device used to prevent overloading and short circuiting .

When overloading and shortcircuiting occurs it melts and breaks the circuit.

Hope this will help