The term “diode” is customarily reserved for small signal devices, I ≤ 1 A. The term “rectifier” is used for power devices, I > 1 A.
The diode is the earliest and simplest type of electronic valve having two active terminals, an anode and a cathode (p-n junction), used in circuits for converting alternating current to direct current. It was formerly widely used as a rectifier and detector but has now been replaced in most electrical circuits by the more efficient and reliable semiconductor diode.
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