Electrical engineering - Basics Page 9

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Diagram 13: Factors that influence the electrical resistance

The above mentioned four factors have the following effects on the electrical resistance:

In order to be able to better and faster compare the effects of the factors of influence on the conductor resistance, the resistivity [Rho] has been defined for materials. The resistivity of a material refers by definition to a conductor length of 1m, a conductor cross section of 1mm2 and a temperature of 20C (Anders Celsius, Swedish physicist, 1701-1744). With the help of the resistivity r one can determine the total resistance R of a conductor according to the following formula:

Examples for different resisitivities
Resistivity ( * mm2)/m
Silver 0,0149
Copper 0,0178
Aluminium 0,0241
Iron 0,1400


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