What is the term for the inverse of impedance?
The correct answer is D: Admittance. The term for the inverse of impedance is admittance. Admittance (Y) = 1/Z, where Z is impedance. For amateur radio operators, this is a fundamental circuit concept. Understanding this helps when working with impedance and admittance.
Exam Tip
Inverse of impedance = admittance. Think 'A'dmittance = 'A'dmittance is '1'/Z. Admittance (Y) = 1/Z, where Z is impedance. Not conductance (1/R), not susceptance (part of Y), not reluctance (magnetic) - just admittance.
Memory Aid
"Inverse of impedance = admittance. Think 'A'dmittance = 'A'dmittance is '1'/Z. Admittance (Y) = 1/Z, where Z is impedance. Represents ease of current flow, opposite of impedance."
Real-World Application
An impedance of 50 ohms has an admittance of 1/50 = 0.02 siemens. Admittance is the inverse of impedance - it represents how easily current flows, while impedance represents opposition. Admittance is useful in parallel circuit calculations.
Key Concepts
Why Other Options Are Wrong
Option A (Conductance): Incorrect. Conductance is the inverse of resistance (1/R), not impedance. Conductance is for DC resistance, not AC impedance.
Option B (Susceptance): Incorrect. Susceptance is the imaginary part of admittance, not the inverse of impedance. Susceptance is a component of admittance.
Option C (Reluctance): Incorrect. Reluctance is a magnetic circuit term, not an electrical circuit term. Reluctance is for magnetic circuits, not electrical.
题目解析
The correct answer is D: Admittance. The term for the inverse of impedance is admittance. Admittance (Y) = 1/Z, where Z is impedance. For amateur radio operators, this is a fundamental circuit concept. Understanding this helps when working with impedance and admittance.
考试技巧
Inverse of impedance = admittance. Think 'A'dmittance = 'A'dmittance is '1'/Z. Admittance (Y) = 1/Z, where Z is impedance. Not conductance (1/R), not susceptance (part of Y), not reluctance (magnetic) - just admittance.
记忆口诀
Inverse of impedance = admittance. Think 'A'dmittance = 'A'dmittance is '1'/Z. Admittance (Y) = 1/Z, where Z is impedance. Represents ease of current flow, opposite of impedance.
实际应用示例
An impedance of 50 ohms has an admittance of 1/50 = 0.02 siemens. Admittance is the inverse of impedance - it represents how easily current flows, while impedance represents opposition. Admittance is useful in parallel circuit calculations.
错误选项分析
Option A (Conductance): Incorrect. Conductance is the inverse of resistance (1/R), not impedance. Conductance is for DC resistance, not AC impedance. Option B (Susceptance): Incorrect. Susceptance is the imaginary part of admittance, not the inverse of impedance. Susceptance is a component of admittance. Option C (Reluctance): Incorrect. Reluctance is a magnetic circuit term, not an electrical circuit term. Reluctance is for magnetic circuits, not electrical.
知识点
Admittance, Inverse of impedance, Impedance, Circuit theory
Verified Content
Question from official FCC General Class question pool. Explanation reviewed by licensed amateur radio operators.