Bjt is bipolar because in bjt the conduction of current is due
to the electrons as well as holes
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Disadvantage:Easy to damage when compared to BJT
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Bipolar junction transistor(BJT)
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Mainly there are two types of transistors. They are BJT (Bipolar
Junction Transistors) and FET(Field Effect Transisters). In BJT,
there are two types called PNP and NPN. Actually NPN means a BJT
transister.