How to calculate resistivity?
GeneralClass 12AllAnswered 27 Mar 2026
Answer
To calculate resistivity, follow these steps:
- Measure the resistance (R) of the material using an ohmmeter
- Measure the length (L) of the conductor
- Calculate the cross-sectional area (A) of the conductor
- Apply the formula: ρ = RA/L
Example: If a wire has resistance of 2 Ω, length of 5 meters, and cross-sectional area of 0.001 m², then ρ = (2 × 0.001)/5 = 0.0004 Ω·m
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