Resistividade condutor
- Created by
- Renato Passos, Eng. de Software
- Reviewed by
- Renato Passos, Eng. de Software
Last updated: Apr 18, 2026
About this calculator
The conductor resistivity calculator computes the resistivity (ρ) of a conductive material using the formula ρ = R·A/L. It is used to determine a material's inherent resistance to electric current flow, based on its electrical resistance (R), cross-sectional area (A), and length (L). This calculation is vital for studying electrical properties of materials.
Resistivity is an intrinsic property, meaning it does not depend on physical dimensions but on the material's composition and atomic structure. To use the calculator, measure the electrical resistance, cross-sectional area (in m²), and length (in meters). The formula combines these values to produce resistivity in ohm-meters (Ω·m).
This tool is applied in electrical engineering, material physics, and industries working with conductors. Common precautions include ensuring unit consistency (ohms, square meters, meters) and measuring only the cross-sectional area, not the total object area.
Example applications include comparing the efficiency of metals like copper and aluminum as conductors, analyzing the quality of metallic alloys in industrial use, or validating experimental data in physics labs. The formula is also used to verify theoretical models in material science.
Frequently asked questions
What is resistivity and why is it important?
Resistivity measures a material's ability to resist electric current. It is crucial for determining conductor efficiency in applications like electrical wires or circuits.
How should I measure resistance R accurately?
Use an ohmmeter or multimeter to measure resistance in ohms (Ω), ensuring the circuit is turned off during measurement.
What units should I use for area and length?
Use square meters (m²) for area and meters (m) for length. Converting units ensures accurate calculations.
Does resistivity vary with temperature?
Yes, metallic resistivity typically increases with temperature. For precise results, keep the temperature constant during testing.
Can I use this calculator for non-conductive materials?
No, as this formula is specific to conductors. Insulators require different methods for resistivity analysis.