SUMMARY
Ohm’s law states that the voltage across a conductor is directly proportional to the current flowing through it, provided all physical conditions and temperature, remain constant.
V = I R
Resistivity formula,
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If the resistance of a conductor with length 1 m and area of cross-section 1 sq. m be R Ω. Then, Resistivity,
ρ = R
ie, the resistivity of a substance is the resistance of a conductor of unit length and unit area of cross-section.
The resistivity of a substance is a constant at fixed temperature. But, it will be different for different materials.
The SI unit of resistivity is Ωm.
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