Question

Two fuse wire A and B of the same length are rated 15A and 5A. Which amongst the A and B will be thicker and why?

• A. The wire A with 15 A rating is thicker
• B. The wire B with 5 A rating is thicker
• C. Both have equal thickness
• D. None

Answer 1

The correct option is A The wire A with 15 A rating is thicker

As wire A carries more current, thus it must have less resistance and to do so, the wire must be thicker because resistance of the wire is inversely proportional to its cross-section area.

Hence option A is correct.