Deep Dive: E7D04
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.
Why Other Answers 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.
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 Example
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.
Source & Coverage
Question Pool: 2024-2028 Question Pool
Subelement: E7D
Reference: 2024-2028 Question Pool · E7 - Practical Circuits
Key Concepts
Verified Content
Question from the official FCC Extra Class pool. Explanation reviewed by licensed amateur radio operators and mapped to the E7D topic.