Explain, clearly, the safety role of fuses in household electrical circuits. - Junior Cycle Science - Question f - 2006

Fuses play a critical safety role in household electrical circuits by preventing damage caused by excess current.

1. Melting or Blowing: When the current flowing through the circuit exceeds the rated capacity of the fuse, the fuse element melts or breaks. This effectively interrupts the flow of electricity and prevents potential hazards.

2. Cutting off the Supply: By breaking the circuit, fuses cut off the electrical supply to the appliances and devices connected to that circuit. This helps protect them from damage and prevents the risk of fire.

3. Overload Prevention: Fuses allow for the safe operation of electrical devices by limiting the current that can pass through the circuit. If a malfunction occurs or if too many devices are connected, the fuse will blow to prevent damage due to excess current.