Transistors - A Miracle invention
A transistor is a semiconductor device used for amplification & switching. It is made of Semiconductor which consists of 3 terminals namely collector, base & emitter.
There are two basic types of transistors called NPN and PNP transistors (Symbols given below).
https://learn.sparkfun.com/tutorials/transistors
Applications of transistors include amplifiers, oscillators, electronic switches and many many more.
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