Question

What is electrical resistivity of a material what is its unit ? Study the factors on which the resistance of conducting wire depends?

Answer 1

Electrical resistivity : The resistivity of a conductor is defined as the resistance of the conductor of length and unit area of cross-section.

$Asweknow,$

$R=\frac{pl}{A}$

$p=\frac{RA}{l}ohmm$

S.I.unit of resistivity is ohm-meter

factors on which resistance depends upon;

(1) its a property of the material

(2) length

(3) cross section area