Difference between Resistance & Resistivity

Resistance and resistivity are related concepts that describe how much an object or a material opposes the flow of electric current.

1.Resistance is a property that depends on the length, cross-sectional area, and nature of the material, while resistivity is a property that depends only on the nature and temperature of the material.

2.Resistance is measured in ohms (Ω) and resistivity is measured in ohm-meters (Ωm).

The formula for resistance is

R = V/I or

R = ρ L/A

where V is voltage,

I is current,

ρ is resistivity,

L is length,

A is cross-sectional area.

The formula for resistivity is

ρ = (R×A)/L.

(6) Difference between Resistance and Resistivity –

DefinitionThe property that opposes the flow of electric currentThe attribute of the material that defines the resistance per unit length and cross-sectional area
SI UnitOhm (Ω)Ohm-meter (Ωm)
FormulaR = V/I or R = ρ(L/A)ρ = (R×A)/L
DependenceLength, cross-sectional area, nature and temperature of materialNature and temperature of material
ApplicationsHeaters, fuses, sensors, etc.Quality control test for calcareous soil²¹³


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