A copper conductor of length 500 meters is used to supply electrical energy to a lighting load of 1,000W. In our wire resistance calculator, we have listed some materials, which you can select to find their resistivity and conductivity at 20°C. ÷ by 1000 for resistance per meter. Metal. Cable Resistance Calculator . Cable Calculator: Resistance with three decimals at 20 °C please enter decimal separator as "." Temperature coefficient [K-1] Silver 1.59 × 10-8. If the cross sectional area of the conductor is 10mmsq, calculate the resistance of the conductor. Resistivity (Ω . Resistance Calculator. Note: To use different values for the Resistivity, select Enter Data in the Conductor Material selection text box and then enter the required Resistivity (ρ) value in the box highlighted in amber. For example, the electrical conductivity of copper is σ ≈ 5.95 * 10^7 S / mand the electrical resistivity of copper is ρ ≈ 1.68 * 10^(-8) Ω * m. Dominik Czernia, PhD candidate m) at 20 °C. (This works for copper cable) Here are a couple of simple examples: 1, the cable has a CSA of 2.5mm² 19 ÷ by 2.5mm² will give you 7.6 ohms per km. If the copper conductor were replaced with an Aluminium conductor of the same length, calculate the resistance of the Aluminium conductor. Round Wire Resistance Calculator Calculates the dc Resistance of a single round wire of common conducting materials using Equation 2 below. Length of the Wire: Wire Cross Area: Resistivity: Resistance: Resistance formula is: R = ρL/A Where: ρ: Resistivity constant of the material, in Ω.m L: Length of the wire, in meter A: Cross sectional area of the wire, in m^2 R: Resistance, in ohms (Ω) Metal Resistivity Table.