Which of the following components can consist of three regions of semiconductor material?
The correct answer is B: Transistor. A transistor is the component that can consist of three regions of semiconductor material. Transistors have three regions: emitter, base, and collector (bipolar) or source, gate, and drain (FET).
Transistors are three-terminal semiconductor devices with three regions of semiconductor material. Bipolar transistors have NPN or PNP structures with three regions (emitter, base, collector). Field-effect transistors (FETs) have three regions (source, gate, drain). These three regions allow the transistor to amplify signals or switch currents. The three-region structure is fundamental to how transistors work - the middle region controls current flow between the outer regions.
Exam Tip
Transistor = Three semiconductor regions. Remember: Transistors consist of three regions of semiconductor material - emitter/base/collector (bipolar) or source/gate/drain (FET).
Memory Aid
"**T**ransistor = **T**hree **R**egions (think 'T = TR')"
Real-World Application
You're examining a transistor. It has three terminals connected to three regions of semiconductor material. In a bipolar transistor, these are the emitter, base, and collector. The three-region structure allows the transistor to amplify signals - a small current in the base controls a larger current between emitter and collector.
Key Concepts
Why Other Options Are Wrong
Option A: Incorrect. Alternators are electromechanical devices that generate AC power, not semiconductor devices with three regions. They're rotating machines, not transistors.
Option C: Incorrect. Triodes are vacuum tubes with three electrodes (cathode, grid, plate), not semiconductor devices. They're obsolete components, not modern transistors.
Option D: Incorrect. Pentagrid converters are vacuum tubes with five grids, not semiconductor devices with three regions. They're obsolete components used in old radios.
题目解析
The correct answer is B: Transistor. A transistor is the component that can consist of three regions of semiconductor material. Transistors have three regions: emitter, base, and collector (bipolar) or source, gate, and drain (FET). Transistors are three-terminal semiconductor devices with three regions of semiconductor material. Bipolar transistors have NPN or PNP structures with three regions (emitter, base, collector). Field-effect transistors (FETs) have three regions (source, gate, drain). These three regions allow the transistor to amplify signals or switch currents. The three-region structure is fundamental to how transistors work - the middle region controls current flow between the outer regions.
考试技巧
Transistor = Three semiconductor regions. Remember: Transistors consist of three regions of semiconductor material - emitter/base/collector (bipolar) or source/gate/drain (FET).
记忆口诀
**T**ransistor = **T**hree **R**egions (think 'T = TR')
实际应用示例
You're examining a transistor. It has three terminals connected to three regions of semiconductor material. In a bipolar transistor, these are the emitter, base, and collector. The three-region structure allows the transistor to amplify signals - a small current in the base controls a larger current between emitter and collector.
错误选项分析
Option A: Incorrect. Alternators are electromechanical devices that generate AC power, not semiconductor devices with three regions. They're rotating machines, not transistors. Option C: Incorrect. Triodes are vacuum tubes with three electrodes (cathode, grid, plate), not semiconductor devices. They're obsolete components, not modern transistors. Option D: Incorrect. Pentagrid converters are vacuum tubes with five grids, not semiconductor devices with three regions. They're obsolete components used in old radios.
知识点
Transistor, Three regions, Semiconductor structure, Bipolar transistor
Verified Content
Question from official FCC Technician Class question pool. Explanation reviewed by licensed amateur radio operators.