What letter is used to represent reactance?
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.
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 Application
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.
Key Concepts
Why Other Options 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.
题目解析
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.
考试技巧
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.
记忆口诀
Reactance letter = X. Think 'R'eactance = 'X'. Reactance is represented by X, with XL for inductive and XC for capacitive. Standard notation for reactance.
实际应用示例
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.
错误选项分析
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.
知识点
Reactance, Letter X, Notation, Symbol
Verified Content
Question from official FCC General Class question pool. Explanation reviewed by licensed amateur radio operators.