Multiple choice general knowledge

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 have low melting points so they melt and break the circuit when excessive current flows, protecting appliances from damage. High resistance would cause unnecessary voltage drop and power loss. High melting point would prevent the fuse from melting when needed. Low specific heat is irrelevant to fuse operation. The low melting point (typically tin, lead, or alloys) is the critical safety feature.

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