Which of the following describes a three-terminal voltage regulator?
The correct answer is B: A series regulator. Which of the following describes a three-terminal voltage regulator is a series regulator. Three-terminal regulators (like 78xx) are series regulators. For amateur radio operators, this is important for power supply design. Understanding this helps when using regulators.
Exam Tip
Three-terminal voltage regulator = series regulator. Think 'T'hree-'T'erminal = 'T'ypically 'S'eries regulator. Three-terminal regulators (like 78xx) are series regulators. Not series current source, not shunt regulator, not shunt current source - just series regulator.
Memory Aid
"Three-terminal voltage regulator = series regulator. Think 'T'hree-'T'erminal = 'S'eries. Three-terminal regulators (like 78xx) are series regulators. Important for power supply design."
Real-World Application
A three-terminal voltage regulator: It's a series regulator. The regulator is in series with the load, and examples include the 78xx series. This is what it is - series regulator.
Key Concepts
Why Other Options Are Wrong
Option A (Series current source): Incorrect. Series current source isn't correct - three-terminal regulator is series voltage regulator. Current source isn't correct.
Option C (Shunt regulator): Incorrect. Shunt regulator isn't correct - three-terminal regulator is series regulator. Shunt regulator isn't correct.
Option D (Shunt current source): Incorrect. Shunt current source isn't correct - three-terminal regulator is series regulator. Shunt current source isn't correct.
题目解析
The correct answer is B: A series regulator. Which of the following describes a three-terminal voltage regulator is a series regulator. Three-terminal regulators (like 78xx) are series regulators. For amateur radio operators, this is important for power supply design. Understanding this helps when using regulators.
考试技巧
Three-terminal voltage regulator = series regulator. Think 'T'hree-'T'erminal = 'T'ypically 'S'eries regulator. Three-terminal regulators (like 78xx) are series regulators. Not series current source, not shunt regulator, not shunt current source - just series regulator.
记忆口诀
Three-terminal voltage regulator = series regulator. Think 'T'hree-'T'erminal = 'S'eries. Three-terminal regulators (like 78xx) are series regulators. Important for power supply design.
实际应用示例
A three-terminal voltage regulator: It's a series regulator. The regulator is in series with the load, and examples include the 78xx series. This is what it is - series regulator.
错误选项分析
Option A (Series current source): Incorrect. Series current source isn't correct - three-terminal regulator is series voltage regulator. Current source isn't correct. Option C (Shunt regulator): Incorrect. Shunt regulator isn't correct - three-terminal regulator is series regulator. Shunt regulator isn't correct. Option D (Shunt current source): Incorrect. Shunt current source isn't correct - three-terminal regulator is series regulator. Shunt current source isn't correct.
知识点
Three-terminal voltage regulator, Series regulator
Verified Content
Question from official FCC Extra Class question pool. Explanation reviewed by licensed amateur radio operators.