Which current acts as a constant form of current source in an active region of BJT amplifiers?

a. Collector Current

b. Emitter Current

c. Base Current

d. All of the above

ANSWER: Collector Current

Explanation:

Collector current is independent of collector voltage and depends only on the emitter current in the active region of BJT.

Therefore, the magnitude of collector current is slightly less than that of emitter current because the value of αDC is less than one but, in fact, almost equal to unity.

These reasons enable the collector current to act as a constant form of current source in an active region of BJT