Wires made from some materials melt quickly when large electric current passes through. What are they used for?
Answers
The amount of heat produced in a wire depends on its material, length and thickness. Thus, for different requirements, the wires of different materials and different lengths and thicknesses are used
The wires used for making electric circuits do not normally become hot. On the other hand, the elements of some electric appliances become so hot that they are easily visible. The filament of an electric bulb gets heated to such a high temperature that it starts glowing.
If a large current passes through a wire, the wire may become so hot that it may even melt and break.
Answer:
The wire of the fuse is made of special material whose melting point is very low. So if large current flows through the circuit the wire melts, and breaks the circuit. A current carrying coil of an insulated wire wrapped around a piece of iron is called an electromagnet.