define resistivity and si unit.
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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 of it is ohm-metre.
The resistivity of a material depends on its nature and the temperature of the conductor, but not on its shape and size.
The resistivity of a material depends on its nature and the temperature of the conductor, but not on its shape and size.
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A low resistivity indicates a material that readily allows the movement of electric charge. Resistivity is commonly represented by the Greek letter ρ (rho). The SI unit of electrical resistivity is theohm⋅metre (Ω⋅m) although other units like ohm⋅centimetre (Ω⋅cm) are also in use.
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