Bipolar junction transistor, عشان اللى عاوز يفهم,,,!!!

BJTs
Bipolar junction transistor
npn
Most bipolar transistors used today


NPN is one of the two types of bipolar transistors, in which the letters "N" and "P"
refer to the majority charge carriers inside the different regions of the transistor.
Most bipolar transistors used today are NPN, because electron mobility is higher
than hole mobility in semiconductors, allowing greater currents and faster operation.





Ebers–Moll Model for NPN Transisto










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http://en.wikipedia.org/wiki/Bipolar_junction_transistor