Have you already computed the resistance of your wire? Try our series resistor calculator and parallel resistor calculator to learn how you can calculate the equivalent resistance of various electrical circuits. Combining the above two equations with the ρ = 1 / σ relation, we obtain a similar connection between resistance and conductance: In the advanced mode, you can directly change values of resistivity ρ and conductivity σ. You can use this wire resistance calculator to estimate conductance too, since: A is the cross-sectional area of the wire.ρ is the resistivity of material in Ω × m.Our wire resistance calculator uses the following resistance formula: We can say that it is a perfect conductor.īoth conductance and resistance depend on the geometrical dimensions of a wire. Resistivity in a superconductor drops sharply to zero, and thus the conductivity approaches infinity. In some materials, at very low temperatures, we can observe a phenomenon called superconductivity. Electrical current can smoothly flow through a wire if conductivity is high. As well as resistivity, it is an intrinsic property of the material, but the conductivity units are "siemens per meter" ( S / m). Specifically, it is defined as its inverse: σ = 1 /ρ. On the other hand, we have conductivity σ, which is strictly related to resistivity. You can check our drift velocity calculator to find out how fast electricity is. The higher the resistivity is, the more difficult it is for the current to flow through a wire. The resistivity will always be the same for a specific material, and the resistivity units are "ohm meter" ( Ω × m). It means that it doesn't matter whether the wire is thick or thin, long or short. Resistivity ρ, unlike resistance, is an intrinsic property of a material.
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