ABSTRACT
This chapter explains a PN junction, forward and reverse bias, what a diode is, the structure of a diode, and the main function of a diode. It details a diode among other electrical and electronic components and a diode in schematic diagrams of electronic devices. The chapter describes the characteristic curve of a diode, explores the use of a diode in a circuit, and describes how to check a diode. It shows that any diode has a certain rating that must be respected when used and also explains what a light-emitting diode is. A diode may be damaged by being subjected to currents or voltages beyond its rated values. In such a case, similar to a resistor or a capacitor, a damaged diode either becomes short, or it becomes totally nonconductive. The main application of a diode is for rectification. It can also be used for protection of part of a circuit or a device.
