Conductivity - metallic conductivity and the interpretation of the resistivity unit

Conductivity - metallic conductivity and the interpretation of the resistivity unit

Metallic conductivity and the interpretation of the resistivity unit

The resistivity {volume resistivity (resistivity coefficient )}

Unit cross-sectional area, the resistance value of the unit length of the metal conductor is called the volume resistivity (resistivity), also known as resistance coefficient, using ρ to represent, the unit is the Ω·mm2/m  or μΩ·m

Electrical conductivity

The reciprocal of the volume resistivity is called bulk conductivity (conductivity), also known as the conductance coefficient, using σ, the unit for signs of (MS/m/m).

Electrical conductivity and electrical resistivity relationships:σ = (MS/m)

Electrical conductivity

the percentage of the ratio ofSample conductivity and a standardvalue is called the conductivity of sample。

In 1913, the international annealed copper standard determines: adopting the annealed copper wire with the density of 8.89 g/cm3, the length of1 m, weight for 1 g, 0.15328 Ωas the measurement standards;At 20 ℃ temperature, the resistance coefficient of the annealed copper wire is 0.017241 mm2/ m) Ωor conductivity is 58.0 MS/m) is determined to be IACS (international standard annealed copper), the conductivity of the any other material (% IACS) type is calculated under the available:

Conductivity and resistivity relations: conductivity (% = 0.017241 /ρ * IACS)

The relationship between conductivity and electrical conductivity, electrical conductivity (% IACS= σ / 58.0 * )

namely:58MS/m=IACS 1%IACS=0.58MS/m

1MS/m=1.7241%IACS