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
