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UNIT 6: DIODES AND RECTIFIERS INTRODUCTION A diode is a component that allows current to flow in only one direction. It is like a one-way valve for electricity. Diodes are used to convert AC to DC, protect circuits, and create light THE ELECTRONICS ENGINEER’S HANDBOOK 1 (LEDs). STORY 1: How a Diode Works A diode has two terminals: anode (+) and cathode (-). Current can flow from anode to cathode, but not from cathode to anode. When the anode is more positive than the cathode, the diode is