ELECTRICITY & MAGNETISM ELECTRONICS & SEMICONDUCTORS A  B  C  D  E  F  G  H  I  J  K  L  M  N  O  P  Q  R  S  T  U  V  W  X  Y  Z                    HOME ABOUT CATEGORIES SITE MAP COPYRIGHT ADVERTISE CONTACT entire Web this site diode Diode graphic symbols for (a) electron-tube diode; (B) semiconductor diode Originally an electron tube (valve) having two electrodes (cathode and anode) used as a rectifier, but now extended to include semiconductor devices performing a similar function. The semiconductor diode usually has a single p-n junction. It allows electrons to flow freely in only one direction (n-type material to p-type). A Zener diode blocks current flow until a critical voltage is reached, when it breaks down and conducts. Related categories    • ELECTRICITY AND MAGNETISM    • ELECTRONICS AND SEMICONDUCTORS Also on this site: Encyclopedia of Alternative Energy & Sustainable Living Encyclopedia of History Transport Concepts & Designs (partner site) BACK TO TOP