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BJT stands for Bipolar Junction Transistor. It is a three-terminal electronic device constructed of doped semiconductor material and may be used in amplifying or switching applications.

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Your question is ambiguous, but I will answer one possible case, namely, "Why might someone apply a DC bias to a BJT?". An NPN BJT does not conduct very much current when the base-to-emitter voltage … (Vbe) is less than 0.7V. Typically, a base biasing network for a BJT is used to bring the base into the 'forward active region', where changes in voltage at the base translate into changes in …
answered Jul 8 '14 by jjmilburn