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Answer Posted / pujitha
The [BJT] is useful in amplifiers because the currents at
the emitter and collector are controllable by the relatively
small base current. In an NPN transistor operating in the
active region, the emitter-base junction is forward biased
(electrons and holes recombine at the junction), and
electrons are injected into the base region. Because the
base is narrow, most of these electrons will diffuse into
the reverse-biased (electrons and holes are formed at, and
move away from the junction) base-collector junction and be
swept into the collector; perhaps one-hundredth of the
electrons will recombine in the base, which is the dominant
mechanism in the base current. By controlling the number of
electrons that can leave the base, the number of electrons
entering the collector can be controlled
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