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Metal rectifier
A metal rectifier is an early type of semiconductor rectifier in which the semiconductor is copper oxide or selenium. They were used in power applications to convert alternating current to direct current in devices such as radios and battery chargers. Westinghouse Electric (1886) was a major manufacturer of these rectifiers, under the trade name Westector (now used as a trade name for an overcurrent trip device by Westinghouse Nuclear).
In some countries the term "metal rectifier" is applied to all such devices; in others the term "metal rectifier" normally refers to copper-oxide types, and "selenium rectifier" to selenium-iron types.
== Description ==
Metal rectifiers consist of washer-like discs of different metals, either copper (with an oxide layer to provide the rectification) or steel plated with selenium, interspersed with aluminium discs (which were often of a larger size, to provide cooling).
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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