Question

Write factor affecting resistance of a wire

Answer 1

There are four factors that influence the resistance in a conductor. Thickness (cross sectional area of the wire), length, and temperature. The fourth factor is the conductivity of the material that is used. Some metals (copper, silver) are just more electrically conductive than others (iron, aluminum).

Answer 2

Explanation:

The property of a electrical device to oppose the flow of electric current  is called resistance of the wire. In mathematical terms it can be given as :

$R=\rho\dfrac{l}{A}$

Where

$\rho$ is the resistivity of the material

l is the length of wire

A is the area of cross section of wire

So, it is clear that the resistance of the wire is directly proportional to the length and inversely proportional to the area of cross section. Resistance of wire also depends on the temperature. On increasing the temperature, the resistance also increase.