Electrical Conductance and Conductivity

Conductance (G) is reciprocal of resistance. Whereas resistance of a conductor measures the opposition which it offers to the flow of current, the conductance measures the inducement which it offers to its flow.

From page Laws of Electrical Resistance,  R=ρlA   or  $G=\frac{1}{\rho }\times \frac{A}{l}=\frac{\sigma A}{l}$

a is called the conductivity or specific conductance of a conductor. The unit of conductance is siemens (S). Earlier,this unit was called mho.

It is seen from the above equation that the conductivity of a material is given by

$\sigma =G\frac{l}{A}=\frac{G siemens\times l meter}{A mete{r}^2}=G\frac{l}{A} siemens/meter$

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