Deep Dive: G5A11
The correct answer is B: X. The letter used to represent reactance is X. Reactance is typically represented by X, with XL for inductive reactance and XC for capacitive reactance. For amateur radio operators, this is standard notation. Understanding this helps when reading circuit diagrams and formulas.
Why Other Answers Are Wrong
Option A (Z): Incorrect. Z represents impedance, not reactance. Impedance includes both resistance and reactance. Option C (B): Incorrect. B represents susceptance (imaginary part of admittance), not reactance. Susceptance is the inverse of reactance. Option D (Y): Incorrect. Y represents admittance (inverse of impedance), not reactance. Admittance is 1/Z, not reactance.
Exam Tip
Reactance letter = X. Think 'R'eactance = 'X' (unknown/variable). Reactance is represented by X, with XL for inductive and XC for capacitive. Not Z (impedance), not B (susceptance), not Y (admittance) - just X.
Memory Aid
Reactance letter = X. Think 'R'eactance = 'X'. Reactance is represented by X, with XL for inductive and XC for capacitive. Standard notation for reactance.
Real-World Example
In formulas, you see XL for inductive reactance and XC for capacitive reactance. The letter X represents reactance. For example, XL = 2πfL and XC = 1/(2πfC). X is the standard symbol for reactance.
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.