Question

How does the
(i) thickness and
(ii) length
of a fuse wire depend on its current rating?

Answer 1

i. The current rating of the fuse wire is directly proportional to the thickness of the fuse wire. Higher the thickness of fuse wire, higher will be the current rating.
ii. The current rating of the fuse wire is independent of its length, since the heat produced is measured per unit length and not throughout the wire.