Question

When how much current flows in the fuse, it melts ?

• A. 200 A
• B. 2 A
• C. 20 A
• D. 2000 A

Answer 1

The Correct Option is C

To solve the problem, we need to identify the typical current at which an electrical fuse melts and breaks the circuit.

1. Understanding the Purpose of a Fuse:
A fuse is a safety device designed to protect electrical circuits from excessive current. It is made of a metal wire or strip that melts when too much current flows through it, thereby breaking the circuit and preventing damage or fire.

2. Typical Fuse Ratings:
For domestic and standard electrical appliances, fuses are typically rated around:

• 1 A to 15 A for small appliances
• Up to 20 A for larger devices or circuits

Values like 200 A or 2000 A are far beyond normal fuse ratings and are typically seen in industrial or special-purpose high-current systems, not in regular fuse applications.

 

Final Answer:
A fuse generally melts when the current exceeds 20 A (Option C).