Conductivity and Ohms Law

Electrical conductivity is an index of a material s ability to conduct an electric current. The electric current occurs in a conductor when an electrical potential difference is placed across it. The strength of electric current I measured (unit amperes. A) depends on the conductor material, on the electrostatic 

The reciprocal of conductivity (1/conductivity) is resistivity (p). Thus, resistivity is an index of difficulty of flow of electric current. 

In metals, the electrons are the carrier of the electrical charge, and in an electrolyte solution, the ions carry the electrical charge. In a NaCl electrolyte solution, sodium ions (Na+) and chlorine ions (Ch) pass electricity from one to the next. This means that the more Na+ and Ch contained in solution, the more electricity is carried, and the higher the conductivity. 

The electrical resistance of a wire would be expected to be greater for a longer wire and less for a wire of larger cross-sectional area and would be expected to depend upon the material out of which the wire is made. Experimentally, the resistance of a wire can be expressed as 

Salinity (Density of Salt in Salt Water) and Conductivity at 25°C 

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