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EFKids - Basic Electronic Components Explained - Learn Transistors
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Transistors

Transistors (Bipolar transistor) consist of either a P-N-P or an N-P-N semiconductor sandwich structure. They are so named because the controlled current must go through two types of semiconductor material: P and N. The current consists of both electron and hole flow, in different parts of the transistor.The three leads of a bipolar transistor are called the Emitter, Base, and Collector.Transistors function as current regulators by allowing a small current to control a larger current. The amount of current allowed between collector and emitter is primarily determined by the amount of current moving between base and emitter.

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