Read the passage carefully and answer the question given below <br><br>
Electric fuse : <br>
It is a safety device used to protect electrical appliances from strong currents. A fuse wire must have high resistivity and low melting point. It is usually made from an alloy of tin and lead. It is put in series with the live wire of the circuit. When the current exceeds the safety limit, the fuse wire melts and breaks the circuit. The electric installations are thus saved from getting damaged.<br><br>
The fuses used for domestic purposes are rated 1A, 2A, 3A, 5A, 10A etc. For an electric iron that consumes 1KW electric power when operated at 220V, a current of (1000/220). A that is 4.54 A will flow in the circuit. In this case a 5A fuse must be used . <br><br>
Question : Fuse wire connected in circuits work under the principle of
