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In this structure we can observe the three terminals of transistor, circuit currents and voltage value representations.

The above figure shows the symbol and structure of NPN transistor. The NPN transistor is mostly used for amplifying and switching the signals. The NPN transistor has three terminals – emitter, base and collector. Generally the NPN transistor is the most used type of bipolar transistors because the mobility of electrons is higher than the mobility of holes. The flowing of these electrons from emitter to collector forms the current flow in the transistor. Here the majority charge carriers are the electrons. The NPN transistor consists of two n-type semiconductor materials and they are separated by a thin layer of p-type semiconductor. NPN transistor is one of the Bipolar Junction Transistor (BJT) types. Output Characteristics of NPN Transistor.α, β and γ Relationship in NPN Transistor.