When NPN transistor is used as an amplifier:
Correct answer: A. Electrons move from base to collector
- A. Electrons move from base to collector
- B. Holes move from emitter to base
- C. Electrons move from collector to base
- D. Holes move from base to emitter
Explanation
In an NPN transistor used as an amplifier, the majority charge carriers are electrons, which flow from the N-type emitter into the P-type base and then proceed to the N-type collector. This movement is critical for the amplification process. Option A is correct because it describes the direction of electron flow correctly. Options B and D are incorrect as they describe the movement of holes, which are not the majority carriers in an NPN transistor. Option C is wrong because it incorrectly describes the direction of electron movement.
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Electrical properties of solids depend on their band structure, charge carriers and conductivity. The topic compares conductors, insulators and semiconductors, relates resistivity to temperature, and covers intrinsic and extrinsic semiconductors, donor and acceptor impurities, electron and hole conduction, and the formation of p-type and n-type materials.
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