Resistivity
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7 Terms
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.
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