Deep Dive: E6A02
The correct answer is A: N-type. Which of the following semiconductor materials contains excess free electrons is N-type. N-type semiconductors have excess electrons (negative charge carriers). For amateur radio operators, this is important for semiconductor knowledge. Understanding this helps when working with semiconductors.
Why Other Answers Are Wrong
Option B (P-type): Incorrect. P-type has excess holes, not electrons - N-type has excess electrons. P-type is wrong. Option C (Bipolar): Incorrect. Bipolar refers to transistor type, not material - N-type has excess electrons. Bipolar isn't the material. Option D (Insulated gate): Incorrect. Insulated gate refers to FET type, not material - N-type has excess electrons. Insulated gate isn't the material.
Exam Tip
Semiconductor with excess free electrons = N-type. Think 'N'-type = 'N'egative charge carriers (electrons). N-type semiconductors have excess electrons. Not P-type (holes), not bipolar (transistor), not insulated gate (FET) - just N-type.
Memory Aid
Semiconductor with excess free electrons = N-type. Think 'N'-type = 'E'lectrons. N-type semiconductors have excess electrons. Important for semiconductor knowledge.
Real-World Example
Semiconductor materials: N-type contains excess free electrons. N-type semiconductors are doped with donor impurities that provide extra electrons. This is the material - N-type has excess free electrons.
Source & Coverage
Question Pool: 2024-2028 Question Pool
Subelement: E6A
Reference: 2024-2028 Question Pool · E6 - Circuit Components
Key Concepts
Verified Content
Question from the official FCC Extra Class pool. Explanation reviewed by licensed amateur radio operators and mapped to the E6A topic.