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Conductors, electric
Conductors are carriers of electricity. They serve as uninsulated overhead lines or as insulated conductors for the supply of electrical energy to the consumer. A number of metals have good electrical conductivity, their specific resistance d is expressed in
1 Ohm mm2
         Â
m
Copper is a suitable material for electric power lines or wires, it has a specific resistance of d = 0.01754. Aluminium conductors with d = 0.0286 are mainly used for the construction of high-voltage overhead power transmission lines due to their low weight. Bronze with d=0.04?0.05 is used for contact wires. Only silver with d = 0.015 has a slightly better conductivity than copper and is used for surface improvement in high-frequency engineering. The conductors in power cables are individually insulated to prevent contact with other conductors.
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