Definition:
A transistor in which a P-type
semiconductor is sandwiched between tow N-type semiconductors, is known as NPN
transistor.
NPN is one of the two types of bipolar transistors, consisting of a layer of P-doped semiconductor (the "base") between two N-doped layers. (As shown in the Diagram)
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| NPN Transistor |
In this type of transistor, a small
amount of current flows because P-region(Base) has a small amount of charge carriers.
The holes move from base towards
emitter, they cannot go towards collector because collector has smaller amount
of charge carriers as compared to emitter.
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| Symbol of NPN (Circuit Diagram) |
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