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what do you mean by resistivity

Dear student,
Resistivity of a material is the resistance offered by that material having unit length and unit area of cross section. It basically measures the resisting power to the flow of charge carriers or current in that specific material.
Mathematically,
R=ρLAwhere, R = resistanceL = lengthA= area of cross sectionand ρ = resistivity.The resistivity value does not depends on the dimension of material used.It only depends on temperature and nature of the material.
For example, resistivity of copper is 1.72 x 10-8 Ωm, that means resistance offered by a unit length and unit cross sectional copper wire is 1.72 x 10-8 Ω.

Regards,

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View Full Answer
Resistivity is defined as the electrical resistance of a conductor of unit cross-sectional area and unit length. The resistance of any conductor is directly proportional to the length of the conductor and inversely proportional to the area of cross-section of the conductor.
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Dear student,

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The resistivity of a material is the resistance of a wire of that material of unit length and unit cross-sectional area. The unit for resistivity is the ohm-metre. The resistivity of of a material depends on its nature and the temperature of the conductor but not its shape or size.

Hope it helps :) 
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