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Semiconductor device with 3 leads:

1. Emitter
2. Base
3. Collector

Transistors allow or restrict current flow with the application of voltage.

There are two types of transistors: bipolar and field-effect transistors (FETs). Unlike bopolar transistors, the leads of FETs are referred to as gate, source and drain.

Bipolar transistors can be divided into two categories: NPN and PNP.NPN transistors act like normally opened swtches. PNP transistors act like NC switches.

Function

Can amplify the current or can be used as a switch.

Operating Values

These values vary and you must refer to the datasheets.