What are the names of the electrodes of a bipolar junction transistor?
The correct answer is B: Emitter, base, collector. A bipolar junction transistor (BJT) has three electrodes called the emitter, base, and collector. These three terminals correspond to the three regions of semiconductor material (NPN or PNP structure). The emitter emits charge carriers, the base controls current flow, and the collector collects the charge carriers. This is different from field-effect transistors (FETs), which have gate, drain, and source terminals. For amateur radio operators, understanding BJT terminal names is essential when reading schematics, troubleshooting amplifiers, and working with transistor circuits. The base-emitter junction controls current flow between emitter and collector, which is the fundamental operation of bipolar transistors.
Exam Tip
BJT = Emitter, Base, Collector. FET = Gate, Drain, Source. If the question asks about bipolar junction transistor electrodes, the answer is emitter, base, collector. Remember: EBC for BJT, GDS for FET.
Memory Aid
"BJT = Emitter, Base, Collector. Think 'B'JT has 'E'mitter, 'B'ase, 'C'ollector. EBC for bipolar, GDS for FET."
Real-World Application
In your transceiver's audio amplifier, a bipolar transistor has its emitter connected to ground, base receiving the audio signal, and collector connected to the power supply through a load resistor. The small base current controls a much larger collector-emitter current, amplifying the audio signal. Understanding which terminal is which helps when testing transistors, reading schematics, and troubleshooting amplifier circuits.
Key Concepts
Why Other Options Are Wrong
Option A (Signal, bias, power): Incorrect. These describe functions or connections, not the actual terminal names. BJT terminals are named emitter, base, and collector based on their physical structure and function.
Option C (Input, output, supply): Incorrect. These describe circuit connections, not terminal names. While base is often the input and collector the output, the actual terminal names are emitter, base, and collector.
Option D (Pole one, pole two, output): Incorrect. These are not standard transistor terminal names. BJTs have specific names: emitter, base, and collector.
题目解析
The correct answer is B: Emitter, base, collector. A bipolar junction transistor (BJT) has three electrodes called the emitter, base, and collector. These three terminals correspond to the three regions of semiconductor material (NPN or PNP structure). The emitter emits charge carriers, the base controls current flow, and the collector collects the charge carriers. This is different from field-effect transistors (FETs), which have gate, drain, and source terminals. For amateur radio operators, understanding BJT terminal names is essential when reading schematics, troubleshooting amplifiers, and working with transistor circuits. The base-emitter junction controls current flow between emitter and collector, which is the fundamental operation of bipolar transistors.
考试技巧
BJT = Emitter, Base, Collector. FET = Gate, Drain, Source. If the question asks about bipolar junction transistor electrodes, the answer is emitter, base, collector. Remember: EBC for BJT, GDS for FET.
记忆口诀
BJT = Emitter, Base, Collector. Think 'B'JT has 'E'mitter, 'B'ase, 'C'ollector. EBC for bipolar, GDS for FET.
实际应用示例
In your transceiver's audio amplifier, a bipolar transistor has its emitter connected to ground, base receiving the audio signal, and collector connected to the power supply through a load resistor. The small base current controls a much larger collector-emitter current, amplifying the audio signal. Understanding which terminal is which helps when testing transistors, reading schematics, and troubleshooting amplifier circuits.
错误选项分析
Option A (Signal, bias, power): Incorrect. These describe functions or connections, not the actual terminal names. BJT terminals are named emitter, base, and collector based on their physical structure and function. Option C (Input, output, supply): Incorrect. These describe circuit connections, not terminal names. While base is often the input and collector the output, the actual terminal names are emitter, base, and collector. Option D (Pole one, pole two, output): Incorrect. These are not standard transistor terminal names. BJTs have specific names: emitter, base, and collector.
知识点
BJT terminals, Emitter base collector, Bipolar junction transistor, Transistor electrodes
Verified Content
Question from official FCC Technician Class question pool. Explanation reviewed by licensed amateur radio operators.