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photo a gate can keep you out or let you into a field in the same way a microscopic logic gate is a barrier in an electronic circuit that can let electricity through or stop it flowing altogether put lots of logic gates together and you make a machine that s capable of basic mathematical reasoning
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.