The power dissipation across the transistor mainly occurs at the collector junction. What is power dissipated by transistor in active region? Similarly PNP transistor is formed by sandwiching n-type semiconductor between two P type semiconductors. PNP transistor is formed by sandwiching n-type semiconductor between two P-type semiconductors. BJT is of two types 1) PNP transistor 2) NPN transistor. Transistor is active device which has the ability to control the electron flow through it. Emitter is heavily doped collector is moderately doped and base is lightly doped as we need most of the current from emitter should reach collector base current is needed only as a pilot signal for collector current variation. BJT has three terminals a) Emitter b) base c) collector analogous to cathode gate and anode in vacuum tube. The name Bipolar came from the fact that the device operation depends on movement of charge carriers with both polarities (holes and electrons). There are mainly three types of transistors used in electronic circuits they are a) bipolar junction transistor b) Junction field effect transistor c) Metal oxide semiconductor field effect transistor. Transistor has three terminals and is used in electronic circuits as amplifiers and switches. Transistor is a semiconductor device capable of transferring the signal from high resistance to low resistance or vice versa.
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