What is electrical conductivity and conductor resistance?

Electrical conductivity and conductor resistivity are essentially the opposite of each other:

Electrical conductivity is the ability of a material to conduct an electrical current.

Conductor resistance is the inherent resistance to current flow in a conductor.

The more electrically conductive a material is the less resistance it offers to current flow. The more resistance the conductor is to current flow, the less conductive it is.

Testing electrical conductivity and conductor resistance

Due to its excellent electrical properties as well as ready availability, copper is the metal most frequently used for electrical conductors. In 1913 the IEC (International Electrotechnical Commission) established a standard for copper conductivity, the IACS (International Annealed Copper Standard), based on the resistivity of annealed copper being equal to 100 percent conductivity.

Although the unit of conductivity is the Mho, its reciprocal, the Ohm is more usually used to express both resistance and thus a measure of conductivity - the lower the resistance in Ohms, the more conductive the material.

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