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Alternating current
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==== Twisted pairs ==== At frequencies up to about 1 GHz, pairs of wires are twisted together in a cable, forming a [[twisted pair]]. This reduces losses from [[electromagnetic radiation]] and [[inductive coupling]]. A twisted pair must be used with a [[Balanced line|balanced]] signaling system so that the two wires carry equal but opposite currents. Each wire in a twisted pair radiates a signal, but it is effectively canceled by radiation from the other wire, resulting in almost no radiation loss.
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