A fuse is used in main electric supply as a safety device. Which one of the following statements about the fuse is correct?

1. It is connected in parallel with the main switch
2. It is made mainly from silver alloys
3. It must have a low melting point
4. It must have a very high resistance

Explanation

Option (c) is correct

• A fuse protects electrical circuits from excess current. It is connected in series, not parallel.
• It should melt quickly when excess current flows. Therefore, it must have a low melting point.

Answer: (c) It must have a low melting point