Multiple choice general knowledge science & technology

For safety the fuse wire used in the mains for household supply of electricity must be made of metal having

  1. high resistance

  2. high melting point

  3. low specific heat

  4. low melting point
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Fuse wires must melt and break the circuit when excessive current flows. This requires a metal with low melting point, so it melts before the wiring or appliances can be damaged. High resistance would cause unnecessary heating, high melting point would prevent the fuse from working, and low specific heat is irrelevant to the fuse's function.

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