Resistivity

Resistivity

A measure of how strongly a given material opposes the flow of electric current.

Specific Resistance

The resistance of a one-metre cube of material, represented by the Greek letter rho (ρ) and expressed in μΩm.

Resistance Units

The resistance of a conductor material is normally very low and is expressed in microhms (μΩ).

Resistivity of Copper

The resistivity of copper is 0.0172 μΩm, which indicates the resistance of a one-metre cube of copper.

Resistance Calculation Formula

The resistance of a particular conductor can be calculated using the formula R = ρ x L / A where L is the length and A is the cross-sectional area.

Cross-Sectional Area

The area of the conductor's cross-section, which plays a role in determining its resistance.

Example of Resistance Calculation

For a 1,000m length of 16mm² single copper conductor, the resistance can be calculated using specific resistivity values.