Question

Write two differences between resistance and resistivity.​

Answer 1

${\mathfrak{\purple{\underline{\underline{Resistance:-}}}}}$

The property of a conductor due to which it opposes the flow of current through it is called resistance. Resistance(R) = Potential difference(V)/Current(I). The resistance of a conductor depends on length,thickness,nature of material and temperature of the conductor.The SI unit of resistance is 'ohm'.

${\mathfrak{\purple{\underline{\underline{Resistivity:-}}}}}$

It is the resistance of a unit length with unit area of cross section of the material of the conductor.

$\sf{Resistivity,\;\rho =\dfrac{RA}{l}}$

The resistivity depends upon the nature of material and average relaxation time of the free electrons in the conductor. The SI unit of resistivity is ohm-m.

Answer 2

Answer:

Explanation:

The resistance is the property of a conductor by virtue of which it opposes the flow of free electrons. It depends on

a) length of the conductor

b) Cross sectional area of conductor

c) Nature of material used to make the conductor (e.g copper, aluminium etc.)

d) Temperature of the conductor

Resistivity is an intrinsic property of a conductor and is independent of the length and cross sectional area of the conductor.

Hence, two conductors of same nature of material but of different size and dimension will have different resistance but same resistivity.

Resistivity of a material depends on temperature only.