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A transistor is a semiconductor device used for amplification and switching applications in electrical and electronic circuits. It consists of three regions: emitter, base, and collector. The transistor action is based on the principle of controlling the flow of current between collector and emitter using a small input current at the base. A transistor usually has two types: NPN and PNP, which differ in the arrangement of semiconductor layers and direction of current flow. In an NPN transistor, a thin p-type _______ _________ __________ _______ ____ __________ _______ _____ _______ ________ _____.
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