# How do I calculate conductivities

## Resistance R and conductance G

In an experiment, a copper and a carbon rod were used to determine the difference between the electrical resistance R and the electrical conductance G.

attemptCopper rodCarbon rod
Amperagelargetiny
free electronsmuchlittle
Conductor propertiesgood (conductor material)bad (resistor material)
Resistance valuesmalllarge
Conductancelargesmall

A consumer with a small resistance conducts the current well and therefore has a high conductance. A consumer with a large resistance conducts the current poorly and therefore has a low conductance.
The greater the resistance R, the smaller the conductance G. The greater the conductance G, the greater the current I.

### Formula symbol

The symbol of the conductance is the capital G.

### Unit of measurement

The unit of measure for the conductance is Siemens (S). Usually the values ​​are given in millisiemens (mS) or microsiemens (µS).

 Siemens 1 p 1 p 100 S. Millisiemens 1 mS 0.001 S 10-3 S. Microsiemens 1 µS 0.000 001 S 10-6 S.

In American literature, the unit Mho is sometimes used instead of Siemens (S) (reverse spelling of Ohm).

### Calculation formulas

The conductance is the reciprocal of the electrical resistance R.

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