Define the resistivity of a conductor?

Resistivity of a conductor is a measure of how strongly the conductor opposes the flow of electric current. It is a material-specific property and is represented by the symbol ρ (rho). The lower the resistivity, the better the material conducts electricity.

Formula for Resistivity

Resistivity (ρ) = R × A / L

• R = Resistance (ohms)
• A = Cross-sectional area (m²)
• L = Length of the conductor (m)

The SI unit of resistivity is ohm meter (Ω·m). Metals like copper and silver have low resistivity, while insulators like rubber have high resistivity. Resistivity changes with temperature. In conductors, resistivity increases as temperature increases.