Deep Dive: G5A03
The correct answer is D: Reactance. The opposition to the flow of alternating current in an inductor is reactance. Inductive reactance (XL) is the opposition that inductors present to AC current. For amateur radio operators, this is a fundamental circuit concept. Understanding this helps when working with inductors.
Why Other Answers Are Wrong
Option A (Conductance): Incorrect. Conductance is the inverse of resistance (1/R), not the opposition in an inductor. Conductance isn't for inductors. Option B (Reluctance): Incorrect. Reluctance is a magnetic circuit term, not an electrical circuit term for AC opposition. Reluctance is for magnetic circuits. Option C (Admittance): Incorrect. Admittance is the inverse of impedance (1/Z), not the opposition in an inductor. Admittance isn't the opposition.
Exam Tip
Inductor AC opposition = reactance. Think 'I'nductor = 'I'nductive 'R'eactance. Inductors present reactance (specifically inductive reactance XL) to AC current. Not conductance, reluctance, or admittance - just reactance.
Memory Aid
Inductor AC opposition = reactance. Think 'I'nductor = 'I'nductive 'R'eactance. Inductors present reactance (XL) to AC current. Frequency-dependent opposition to AC.
Real-World Example
An inductor in an AC circuit presents inductive reactance (XL = 2πfL), which opposes AC current flow. The reactance increases with frequency - higher frequency means more opposition. This is the opposition that inductors present to AC.
Source & Coverage
Question Pool: 2023-2027 Question Pool
Subelement: G5A
Reference: 2023-2027 Question Pool · G5 - Electrical Principles
Key Concepts
Verified Content
Question from the official FCC General Class pool. Explanation reviewed by licensed amateur radio operators and mapped to the G5A topic.