Question

Why is it called a BJT?

Answer 1

BJT stands for Bipolar Junction Transistor. It is called bipolar because it uses both electrons and holes as charge carriers in its operation. The term junction comes from the two PN junctions inside the transistor. And transistor means it can amplify or switch electrical signals.

So, the name BJT highlights its key features:

1. Bipolar → Uses both types of charge carriers (electrons and holes).  
   

1. Junction → Has two PN junctions.  
   

1. Transistor → Works as an amplifier or switch.  
   

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