Answer: 10 mA.
- A 10 mA
- B 5 mA
- C 20 mA
- D 30 mA
Correct answer: A. 10 mA
Explanation: Voltage across the series resistor = 9 − 6 = 3 V, so current = 3 V / 300 Ω = 0.01 A = 10 mA.
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.