In a transistor, the collector section is always moderately doped, but however, is large in size in order to collect most of the charge carrier supplied by the emitter. Collector: In a transistor, a collector is a section that collects the majority charge carrier supplied by the emitter and in this case, the collector-base junction is always reverse biased.The emitter in a transistor is always heavily doped and is moderately sized. With respect to the base, the emitter is always forward biased so that it can supply the majority charge carrier to the base. Emitter: An emitter supplies a large section of charge carriers.These three materials have the following functions: Junction Transistors are mainly controlled by current, meaning that even a small amount of current flowing through its base will result in a large current flow from the emitter to the collector. These types of transistors have two junctions between the p-type and n-type of semiconductors.
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