Conductance of a Length of Wire (MA003E)

The next formula is used to calculate the conductance of a wire as a function of its length, cross–sectional área and nature of the material.

 

Formula 1

G = x.(S/L)

Where:

G is the conductance in siemens (S)

X is the specific conductance or conductivity of the material in m/S

S is the corss-sectional area in square milimeters (mm²)

L is the length im meters (m)

Derivated Formulas

Formula 2

S = G. (L/x)

Formula 3

L = x.(S/G)

Application Example:

What is the conductance of a piece of aluminium wire 2 meters long and with a cross-sectional ara of 1 mm²?

Data:

X = 34,4 m/S (specific conductance for aluminium)

L = 2 m

S = 0,1 mm2

G = ?

Using formula 1:

G = 34,4 x 0,1/2 =1,72 Siemens