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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 has three terminals and acts as an amplifier. For an NPN transistor the terminals are called the âcollectorâ, âbaseâ and âemitterâ. A small current flowing in to the base and out of the emitter controls a much larger current flowing from the collector to the emitter. transistor has three terminals and acts as an amplifier. For an NPN transistor the terminals are called the âcollectorâ, âbaseâ and âemitterâ. A small current flowing in to the base and out of the emitter controls a much larger current flowing from the collector to the emitter.