BIPOLAR JUNCTION TRANSISTOR

INTRODUCTION:

      A transistor is a semiconductor device used to amplify or switch the electronic signal and electrical power. Transistors are also called as current controlling device because it is use to control the electrical power. In this section we will see about BIPOLAR JUNCTION TRANSISTORS  (BJT) .

                           

EXPLANATION AND WORKING OF BJT :

  1. BJT is classified as two , they are NPN Transistors and PNP Transistors.

                

  2.We will take the NPN Transistors for more in details

                         

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  3.There are three terminals in the transistors . They are EMITTER, BASE , COLLECTOR .

  4. In this , EMITTER - BASE is connected in FORWARD BIAS.

                                      

 5. The BASE - COLLECTOR  is connected in REVERSE BIAS .

 6. When the biasing is activated , the electrons from emitter is move to the BASE and and also move to the COLLECTOR.

 7. We will lead to reduce the flow of current in the BASE. so, we increase the reverse bias voltage  and also reduce the thickness of the BASE.

                           

 

 8. By vary the bias voltage to get the desired current.

APPLICATION: 

    

Like AMPLIFIER AND SWITCHING APPAATUS etc.