This is not going to be to deep,I will try to keep your interest and show a few different examples.

Basically there are two different types of transistors. NPN and PNP types,the main difference is
their power supplies as we will see. Transistors all normally have three connections ie. pin outs.
Base (b). Collector (c) and Emitter (e). If we used a water example it could be,the "emitter" where
water comes in,the "collector"were the water goes out and the "base" the tap to control the water
flow. So electrons (current) flow from the emitter to the collector and the base controls the flow.
Transistors can also be connected in a circuit in three main configurations. 1). Common emitter.
2). Common collector and 3). Common base. don't worry to much about this at the moment,as I
hope all will be clear later on. May I add at this point that transistors are "old" devices,dating back
to at least 1943,and if you have a reference book you will see that there literally 1000's of different
types on the market. The good news is that they all work the same way.

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