Answer: I C /I B (collector current divided by base current).
- A I<sub>B</sub>/I<sub>C</sub>, the reciprocal of the actual current gain ratio
- B I<sub>C</sub>/I<sub>B</sub> (collector current divided by base current)
- C I<sub>E</sub>/I<sub>C</sub>, the ratio of emitter current to collector current
- D V<sub>CE</sub>/V<sub>BE</sub>, a ratio of voltages rather than currents
Correct answer: B. I<sub>C</sub>/I<sub>B</sub> (collector current divided by base current)
Explanation: Beta = hFE = I<sub>C</sub>/I<sub>B</sub>. Common emitter current gain. Typical values: 50-300 for BJTs. Small base current controls large collector current.
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.