Define the term resistivity.

The resistivity of a substance is the resistance of a wire of that substance of unit length and unit area of cross-section. Resistivity is the resistance of the flow of current from one end to the other in a material.

The resistivity is designated as ρ and it is directly proportional to the material resistance and length. Resistivity is inversely proportional to the area of cross-section of the given material. High resistivity designates poor conductors. Insulator has high resistivity.

Formula of resistivity

The formula of resistivity can be given as

ρ= RA/l

Where

ρ is the resistivity

R is the resistance

l is the length of the material

A is the area of cross-section.

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1 Comment

  1. sadaksh singh mahindra

    very nice i understood the concept

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