Consisting of a PN-junction, they allow current to pass in only one direction.
Some types of this device exhibit negative resistance at higher voltages. Their current varies exponentially according to the Shockley equation, and four of them make up a bridge rectifier. One type achieves rapid switching by replacing a p-type semiconductor with a metal contact, while another type allows for reverse bias operation because of its reduced breakdown voltage; those are the Schottky and Zener types. Consisting of a PN-junction, they allow current to pass in only one direction. For 10 points, name these circuit components, one type of which is "light-emitting."
Some types of this device exhibit negative resistance at higher voltages.
diodes <LC>