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Copper wire and cable
Copper has been used in electric wiring since the invention of the electromagnet and the telegraph in the 1820s.〔Sturgeon, W., 1825, Improved Electro Magnetic Apparatus, ''Trans. Royal Society of Arts, Manufactures, & Commerce'' (London) 43: pp. 37–52, as cited in Miller, T.J.E, 2001, Electronic Control of Switched Reluctance Machines, ''Newnes'', p. 7. ISBN 0-7506-5073-7〕〔Windelspecht, Michael, 2003, Groundbreaking Scientific Experiments, Inventions, and Discoveries of the 19th Century, XXII, Greenwood Publishing Group, ISBN 0-313-31969-3〕 The invention of the telephone in 1876 created further demand for copper wire as an electrical conductor.〔
Copper is the electrical conductor in many categories of electrical wiring.〔Pops, Horace, 2008, Processing of wire from antiquity to the future, Wire Journal International, June, pp 58-66〕〔The Metallurgy of Copper Wire, http://www.litz-wire.com/pdf%20files/Metallurgy_Copper_Wire.pdf〕 Copper wire is used in power generation, power transmission, power distribution, telecommunications, electronics circuitry, and countless types of electrical equipment.〔 Copper and its alloys are also used to make electrical contacts. Electrical wiring in buildings is the most important market for the copper industry. Roughly half of all copper mined is used to manufacture electrical wire and cable conductors.〔
== Properties of copper ==
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