Multiple choice

The safety fuse should have _____.

  1. high resistance and high melting point

  2. high resistance and low melting point

  3. low resistance and high melting point

  4. low resistance and low melting point

Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

A safety fuse needs high resistance to heat up and melt at a specific low temperature when excess current flows. High resistance converts electrical energy to heat efficiently, while low melting point ensures quick breakage. High melting point would delay circuit protection, and low resistance would prevent adequate heating.