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Copper wires Copper cable Coaxial cable made from copper. Copper has been used in electrical wiring since the invention of the electromagnet and the telegraph in the 1820s. [1] [2] The invention of the telephone in 1876 created further demand for copper wire as an electrical conductor.
The majority of copper usage, worldwide, is for electrical wiring, including the coils of generators and motors. Copper plays a larger role in renewable energy generation than in conventional thermal power plants in terms of tonnage of copper per unit of installed power. [15]
Electrical wiring is the most important market for the copper industry. [132] This includes structural power wiring, power distribution cable, appliance wire, communications cable, automotive wire and cable, and magnet wire. Roughly half of all copper mined is used for electrical wire and cable conductors. [133]
Copper interconnects are used in integrated circuits to reduce propagation delays and power consumption. Since copper is a better conductor than aluminium, ICs using copper for their interconnects can have interconnects with narrower dimensions, and use less energy to pass electricity through them. Together, these effects lead to ICs with ...
Some terminations on wiring devices designed only for copper wire would overheat under heavy current load and cause fires when used with aluminium conductors. Revised standards for wire materials and wiring devices (such as the CO/ALR "copper-aluminium-revised" designation) were developed to reduce these problems. While larger sizes are still ...
The main grade of copper used for electrical applications, such as building wire, motor windings, cables and busbars, is electrolytic-tough pitch (ETP) copper (CW004A or ASTM designation C100140). If high conductivity copper must be welded or brazed or used in a reducing atmosphere, then oxygen-free high conductivity copper (CW008A or ASTM ...
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Geometry is important because it is more difficult to push water through a long, narrow pipe than a wide, short pipe. In the same way, a long, thin copper wire has higher resistance (lower conductance) than a short, thick copper wire. Materials are important as well.