9. Explain the working of an n-p-n transistor

1.	9. Explain the working of an n-p-n transistor
Answer» the emitter-base junction is forward biased and the collector-base junction is reversed biased. Forward biased causes the electron in the n-type emitter to flow toward the base. This constitutes the emitter current Ie. As these electrons flow through the p-type base, these electrons tend to combine with the holes. As the base is lightly doped and very thin,therefore,only few electrons (less than 5%) combine with holes to constitute the base current Ib. The remainder(more than 95) cross over into the collector region to constitute collector current Ic. In this way, almost the entire current fows in the collector circuit. it is clear that emitter current is the sum of the collector current and base currents. i.e.Ie=Ib+Ic

Answer»

the emitter-base junction is forward biased and the collector-base junction is reversed biased.

Forward biased causes the electron in the n-type emitter to flow toward the base. This constitutes the emitter current Ie. As these electrons flow through the p-type base, these electrons tend to combine with the holes. As the base is lightly doped and very thin,therefore,only few electrons (less than 5%) combine with holes to constitute the base current Ib. The remainder(more than 95) cross over into the collector region to constitute collector current Ic. In this way, almost the entire current fows in the collector circuit. it is clear that emitter current is the sum of the collector current and base currents. i.e.Ie=Ib+Ic

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