IT IS situated opposite to the emitter. It forms two PN junctions with Emitter and Collector. So that most of the charge carriers pass to the collector. It is a middle section of a transistor. It is always forward biased with respect to base. 
Main function is to supply the majority carriers to the base.To inject a large number of charge carriers.
polarity of the power supply for each type Collector Base Emitter. Collector ( C ) Principle of operation of the two transistor types PNP and NPN. current regulating devices that control the amount of current flowing through themīJT Basic construction The BJT is a three terminal device that produce two PN junctions. p-type semiconductorsthe material lead to a deficiency of electrons and therefore an excess of positive charge carriers or “holes.”. n-type semiconductorsthe impurities result in an excess of electrons, or negative charges. which basically describes the physical arrangement of the P-type and N-type semiconductor materials. Two basic types of bipolar junction transistor construction,. If the transistor is a PNP, then the arrow points to the base of the transistor, otherwise it points to the output. The symbol of the transistor has an arrow on the emitter. 
Each transistor has 3 leads which we call base, collector and emitter, and we use the symbols b, c and e respectively. if the two materials are N and the middle one is P, then we have a N-P-N material or NPN. if the two similar materials are P and the middle one is N, then we have a P-N-P or PNP transistor. A BJT (Bipolar Junction Transistor) transistor has inside two similar semi conductive materials, and between them there is a third semi conductive material of different type. Impurities have been introduced by a process called “doping”. The transistor is an arrangement of semiconductor materials that share common physical boundaries. Brattain, and William Shockley(later jointly awarded a Nobel Prize) It was also independently developed nearly simultaneously by Herbert Mataré and Heinrich Welker, German physicists working at Westinghouse Laboratory in Paris. A semiconductor device that Amplifies, Oscillates, or Switches the flow of current between two terminals Invention of the Transistor American physicists John Bardeen, Walter H.
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