What is the resistivity formula and unit?
GeneralClass 12AllAnswered 27 Mar 2026
Answer
The resistivity formula is: ρ = RA/L
Where:
- ρ (rho) = resistivity
- R = resistance in ohms (Ω)
- A = cross-sectional area in suare meters (m²)
- L = length in meters (m)
The SI unit of resistivity is ohm-meter (Ω·m). This unit represents the resistance of a material with a cross-sectional area of one suare meter and a length of one meter.
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