Transistor is an electronic device which helps to amplify input signal to produce high output signal. It is made from semi-conductor materials. It consists of three materials as Emitter, collector and base. It is used in circuit to amplify video signal, voltage signal etc.It is of two types NPN transistor and PNP transistor.
NPN transistor has p type semi conductor material sandwiched between N type semi-conductor materials from both side whereas IN PNP transistor N type semi-conductor material is sandwiched between P type semi-conductor materials from both side. It is used in monitor circuit, sound box (speaker), motherboard, printer etc.
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