What Is Diode how is It works Introduction of Diodes Diodes What is Diode how is it works ? A diode is a specialized electronic component with two electrodes called the anode(+) and the cathode(-). Most diodes are made with semiconductor materials such as silicon , germanium , or selenium . Some diodes are comprised of metal electrodes in a chamber evacuated or filled with a pure elemental gas at low pressure. Diode behavior is analogous to the behavior of a hydraulic device called a check valve . A check valve allows fluid flow through it in only one direction as in Figure A diode is an electrical device allowing current to move through it in one direction with far greater ease than in the other (called the diodes forward direction) while blocking current in the opposite direction (the reverse direction). This unidirectional behavior is called rectification, and is used to convert alternating current to direct current, including extraction of modulation from radio signals in...