Question

In a circuit, an electrical device is connected across the battery along with a fuse placed before the device. What possible amount can pass through the fuse if the rating for fuse device is given as 4.5A ?

• A. 5 A
• B. 4 A
• C. None of the above
• D. Can't say

Answer 1

The correct option is B

4 A

The fuse is placed in series with the device. It consists of a piece of wire made of a metal or an alloy of the appropriate melting point, for example, aluminum, copper, iron, lead etc. If a current larger than the specified value flows through the circuit, the temperature of the fuse wire increases. This melts the fuse wire and breaks the circuit.