Diode by Wikipedia.org

Overview & Synopsis

A
diode is a two-terminal electronic component that conducts current primarily in
one direction; it has low resistance in one direction, and high; resistance
in the other. Topics covered includes: Vacuum tube diodes, Solid-state diodes,
Vacuum tube diodes, Semiconductor diodes, Point-contact diodes, Junction diodes,
Shockley diode equation, Small-signal behavior, Reverse-recovery effect, Types
of semiconductor diode, Graphic symbols,Numbering and coding schemes.