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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
All transistors work by controlling the movement of electrons, but not all of them do it the same way. Like a junction transistor, a FET (field effect transistor) has three different terminalsâbut they have the names source (analogous to the emitter), drain (analogous to the collector), and gate (analogous to the base).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.