The correct answer is B: Emitter.
In the common emitter (CE) configuration, the emitter terminal is common to both the input and output circuits — hence the name.
- Input: Applied between the base and emitter terminals.
- Output: Taken between the collector and emitter terminals.
- A small base current controls a much larger collector-to-emitter current, enabling amplification.
Advantages of Common Emitter Configuration:
- High voltage gain — suitable for amplification applications.
- High current gain — efficient control of output current with small input current.
- Inverts the input signal (180° phase shift).
Disadvantages:
- Lower input impedance compared to common base or common collector configurations.
- Relatively high output impedance.
Applications:
- Audio and radio frequency amplifiers.
- Digital switching circuits.
