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A transistor is a miniature electronic component that can do two different jobs. It can work either as an amplifier or a switch: 1  When it works as an amplifier, it takes in a tiny electric current at one end (an input current) and produces a much bigger electric current (an output current) at the other.2  Transistors can also work as switches.ormally, the holes in the base act like a barrier, preventing any significant current flow from the emitter to the collector while the transistor is in its off state. A transistor works when the electrons and the holes start moving across the two junctions between the n-type and p-type silicon.
A transistor is a semiconductor device used to amplify and switch electronic signals and electrical power.It is composed of semiconductor material with at least three terminals for connection to an external circuit.ollector current is approximately Î² (common-emitter current gain) times the base current. It is typically greater than 100 for small-signal transistors but can be smaller in transistors designed for high-power applications. Unlike the field-effect transistor (see below), the BJT is a lowâinput-impedance device.