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An electrical device that converts alternating current to direct current. Rectifiers are most often made of a combination of diodes, which allow current to pass in one direction only. Compare converter, transformer.
device that converts alternating electric current into direct current. It may be an electron tube (either a vacuum or a gaseous type), vibrator, solid-state device, or mechanical device. Direct current is necessary for the operation of many devices such as radio and television receivers and certain power tools.