Question

What is immaterial for an electric fuse?

• A. Its specific resistance
• B. Its length
• C. Its radius
• D. Current flowing through it

Answer 1

The correct option is B

Its length

1. An electric fuse is a safety device that protects electrical circuits from excessive current.
2. If a large amount of current passes through the fuse wire, it melts and thus breaks down the circuit.
3. The thickness of the fuse helps in deciding how much current can be passed through the fuse wire before it melts.
4. The specific resistance of the fuse wire is important for its heating.
5. However, the length of the fuse wire is immaterial.

Hence, option (B) is the correct answer.