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Electrical conductivity or specific conductivity is a measure of a material's ability to conduct an electric current.

## ExplainedEdit

When an electrical potential difference is placed across a conductor, its movable charges flow, giving rise to an electric current.

## Definition of conductivityEdit

The conductivity σ is defined as the ratio of the current density $\mathbf{J}$ to the electric field strength.

Conductivity is the reciprocal (inverse) of electrical resistivity and has the SI units of siemens per metre. Electrical conductivity is commonly represented by the Greek letter σ, but κ or γ are also occasionally used.

Classification of materials by conductivity is also done.