Question

A fuse in an electric circuit acts as a:

• A. current multiplication
• B. voltage multiplication
• C. power multiplier
• D. safety device

Answer 1

Answer: (D)

safety device

The maximum current which can flow through a fuse without melting it, is called its rating.For example a fuse rated at 8 A,can stand current upto 8 A. If current higher than 8 A flows through the fuse, it would melt and circuit gets broken.The rating of a fuse depends upon the thickness of the fuse wire (because length of the wire is fixed) the thicker fuse has higher rating. So, the thickness of the fuse wire in 8 A circuit is more than that of the fuse wire in 5 A circuit. Hence, fuse acts as a safety device.