Question

two fuse wire of same length are rated 5 A and 20 A.
which of the two is thicker and why ?

Answer 1

Resistance is inversely proportional to the thickness of the wire/material.

The 20A wire will be more thicker as it has greater cross-sectional area compared to the 5A wire. It thus makes it more conducting and current can flow through much easily.

Answer 2

The 20 A wire is more thicker .

The more the thickness of wire , then more will be the current because more electrons can pass through a greater area.

Thus the 20 A is thicker.

The fuse is a safety device which limits the amount of current flowing in the circuit .

Details :

It is made up of a material which has low melting point.

This will overheat them and make them melt easily.

Thus the fuse can easily break the circuit and save it if there is any excess current flowing in the circuit.

Explanation

The fuse is generally made up of thin piece of wire so that it offers more resistance and it can melt easily.

Thus the fuse works in the heating effect of current.

H = I²Rt

H = heat .

I = Current .

R = resistance .

t = time