In normal operation of a transistor, the emitter-base junction is forward biased while the collector-base junction is reverse biased.įig. The junction between the collector and the base is called the collector junction. The junction between the emitter and the base is called emitter junction. The main function of the collector is to collect majority charge carriers through the base. This is very lightly doped and is very thin (10- 6 m) as compared to either emitter or collector so that it may pass most of the injected charge carriers to the collector.Ĭollector:- The right-hand side of the transistor is called the collector. Electrons are the charge-carriers within the n-p-n transistor, whereas holes are the charge-carriers within a p-n-p transistor.īase:- The middle section of the transistor is called base. Hence it is more heavily doped in comparison to other regions. The main function of this region is to supply majority charge carriers (either electrons or holes) to the base. A transistor has the following sections:Įmitter:- This forms the left-hand section or region of the transistor. The junction transistors are of two types: p-n-p transistor and n-p-n transistor. Why synchronous motor is not self starting.
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