Question

electrical resistivity of a metallic wire depends upon ? ​

Answer 1

Electrical resistivity of a metallic wire depends on the :
1) Nature of the metallic wire ( number of free electrons per unit volume )
2)Temperature of the conductor

Answer 2

Answer- The above question is from the chapter 'Electricity'.

Let's know about resistance and resistivity.

Resistance- It is the property of a conductor, semi-conductor or insulator to resist the flow of charges.

R = V/I

where R = Potential difference between two end points and I = flow of current.

Resistance is generally measured in Ohms. (Ω)

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

where ρ = resistivity, l = length of material and A = area of material.

R ∝ l

R ∝ ρ

R ∝ 1/A

R ∝ Temperature

Resistivity- It is the materialistic property of a conductor which tells the strength of resistance.

It is denoted by ρ.

ρ ∝ Temperature

ρ is independent of length and area.

Given question: What does electrical resistivity of a metallic wire depend upon? ​

Answer: Electrical resistivity of a metallic wire depends upon temperature.