Current Gain βEasyQuestion 20235
Question
Current gain β (hFE) of a BJT in common emitter configuration is:
- AI_C/I_E
- BI_C/I_BCorrect
- CI_B/I_C
- DI_E/I_C
Correct answer
I_C/I_B
Explanation
β = I_C/I_B. Typical values: 50–300. A small base current controls a much larger collector current → transistor amplifies current. Related to α (common-base gain): β = α/(1−α), where α = I_C/I_E.