What is admittance?
The correct answer is A: The inverse of impedance. What is admittance is the inverse of impedance. Admittance Y = 1/Z. For amateur radio operators, this is important for circuit theory. Understanding this helps when working with admittance.
Exam Tip
Admittance = inverse of impedance. Think 'A'dmittance = '1'/'I'mpedance. Admittance Y = 1/Z. Not FET gain, not inverse of reactance, not FET on-impedance - just inverse of impedance.
Memory Aid
"Admittance = inverse of impedance. Think 'A'dmittance = '1'/'Z'. Admittance Y = 1/Z. Important for circuit theory."
Real-World Application
Admittance: It's the inverse of impedance. If impedance Z = 50 ohms, then admittance Y = 1/50 = 0.02 siemens. This is what admittance is - the inverse of impedance.
Key Concepts
Why Other Options Are Wrong
Option B: Incorrect. Term for gain of FET isn't admittance - admittance is inverse of impedance. FET gain isn't admittance.
Option C: Incorrect. Inverse of reactance isn't admittance - admittance is inverse of impedance. Inverse of reactance isn't admittance.
Option D: Incorrect. Term for on-impedance of FET isn't admittance - admittance is inverse of impedance. FET on-impedance isn't admittance.
题目解析
The correct answer is A: The inverse of impedance. What is admittance is the inverse of impedance. Admittance Y = 1/Z. For amateur radio operators, this is important for circuit theory. Understanding this helps when working with admittance.
考试技巧
Admittance = inverse of impedance. Think 'A'dmittance = '1'/'I'mpedance. Admittance Y = 1/Z. Not FET gain, not inverse of reactance, not FET on-impedance - just inverse of impedance.
记忆口诀
Admittance = inverse of impedance. Think 'A'dmittance = '1'/'Z'. Admittance Y = 1/Z. Important for circuit theory.
实际应用示例
Admittance: It's the inverse of impedance. If impedance Z = 50 ohms, then admittance Y = 1/50 = 0.02 siemens. This is what admittance is - the inverse of impedance.
错误选项分析
Option B: Incorrect. Term for gain of FET isn't admittance - admittance is inverse of impedance. FET gain isn't admittance. Option C: Incorrect. Inverse of reactance isn't admittance - admittance is inverse of impedance. Inverse of reactance isn't admittance. Option D: Incorrect. Term for on-impedance of FET isn't admittance - admittance is inverse of impedance. FET on-impedance isn't admittance.
知识点
Admittance, Inverse of impedance, Circuit theory
Verified Content
Question from official FCC Extra Class question pool. Explanation reviewed by licensed amateur radio operators.