Resistivity, commonly symbolized by the Greek letter rho, ρ, is quantitatively equal to the resistance R of a specimen such as a wire, multiplied by its cross-sectional area A, and divided by its length l; ρ = RA/l. The unit of resistance is the ohm.

What is resistivity with example?

For example, the resistivity of copper is generally given as: 1.72 x 10^-8 Ωm. The resistivity of a particular material is measured in units of Ohm-Metres (Ωm) which is also affected by temperature. ... Conductivity, σ is the reciprocal of the resistivity. That is 1/ρ and has the unit of siemens per metre, S/m.

What is resistivity of material?

Resistivity of the material is defined as the resistance offered to current flow by a conductor of unit length having unit area of cross-section. It is the property of the material, does not depend on physical dimensions. Unit is ohm-metre(Ωm) Resistance of an object is related to resistivity as follows: R=Aρ l​