# Resistance and Conductance

## The reciprocal of electrical resistance is conductance

The unit of electric resistance is ohm *(Ω)*

*R = U / I (1)*

*where *

*R = resistance (ohm, Ω)*

*U = electrical potential (volts)*

*I = current flow (ampere)*

The reciprocal of resistance is conductance

*G = 1 / R (2)*

*where*

*G = conductance (siemens, S)*

### Example - Conductance

Conductance of a conductor with resistance *10 Ω *can be calculated as

*G = 1 / ( 10 Ω)*

* = 0.1 siemens, S*