Transistor: Learn what a transistor

Learn what a transistor is, how it is constructed and how it works as a switch or an amplifier. Understand the difference between PNP and NPN transistors and how to bias them. What is a Transistor ? A transistor is a semiconductor that controls voltage or current flow in electronic signals and it amplifies and acts as a switch for them. Transistor consists of three layers each of which can carry a current. If the transistor is working as an amplifier then it transforms a small input current into a big output current. An easy-to-understand introduction to transistors , including simple diagrams explaining how junction transistors and FETs work. Curious about transistors? Explore BJT, FET, NPN, and PNP types with easy classifications to boost your electronics knowledge.