<Dl> <Dd> R = ρ l A, G = σ A l . (\ displaystyle (\ begin (aligned) R& = \ rho (\ frac (\ ell) (A)), \ \ G& = \ sigma (\ frac (A) (\ ell)). \ end (aligned))) </Dd> </Dl> <Dd> R = ρ l A, G = σ A l . (\ displaystyle (\ begin (aligned) R& = \ rho (\ frac (\ ell) (A)), \ \ G& = \ sigma (\ frac (A) (\ ell)). \ end (aligned))) </Dd> <P> where l (\ displaystyle \ ell) is the length of the conductor, measured in metres (m), A is the cross-sectional area of the conductor measured in square metres (m2), σ (sigma) is the electrical conductivity measured in siemens per meter (S m), and ρ (rho) is the electrical resistivity (also called specific electrical resistance) of the material, measured in ohm - metres (Ω m). The resistivity and conductivity are proportionality constants, and therefore depend only on the material the wire is made of, not the geometry of the wire . Resistivity and conductivity are reciprocals: ρ = 1 / σ (\ displaystyle \ rho = 1 / \ sigma). Resistivity is a measure of the material's ability to oppose electric current . </P> <P> This formula is not exact, as it assumes the current density is totally uniform in the conductor, which is not always true in practical situations . However, this formula still provides a good approximation for long thin conductors such as wires . </P>

What is the resistance in a conductor dependant on
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