Answer: active region.
- A cut-off region
- B saturation region
- C breakdown region
- D active region
Correct answer: D. active region
Explanation: For faithful amplification the emitter junction is forward biased and the collector junction reverse biased, which is the active region.
Conductors have overlapping bands, semiconductors have a small energy gap that can be bridged by heat or doping, and insulators have a large gap that blocks conduction.
Concept context
Band theory, p-n junction, diodes, transistors, logic gates, and integrated circuits.