What is the magnitude of the impedance of a parallel RLC circuit at resonance?
The correct answer is A: Approximately equal to circuit resistance. What is the magnitude of the impedance of a parallel RLC circuit at resonance is approximately equal to circuit resistance. At parallel resonance, impedance is maximum and approximately equal to R. For amateur radio operators, this is important for circuit theory. Understanding this helps when working with resonant circuits.
Exam Tip
Parallel RLC impedance at resonance = approximately equal to circuit resistance. Think 'P'arallel 'R'LC at 'R'esonance = 'R'esistance. At parallel resonance, impedance is maximum and approximately equal to R. Not inductive reactance, not low, not high - just approximately equal to resistance.
Memory Aid
"Parallel RLC impedance at resonance = approximately equal to circuit resistance. Think 'P'arallel 'R'LC at 'R'esonance = 'R'esistance. At parallel resonance, impedance is maximum and approximately equal to R. Important for circuit theory."
Real-World Application
A parallel RLC circuit at resonance: The impedance magnitude is approximately equal to the circuit resistance. At parallel resonance, the impedance is maximum and approximately equal to R. This is the impedance - approximately equal to resistance.
Key Concepts
Why Other Options Are Wrong
Option B: Incorrect. Approximately equal to inductive reactance isn't correct - at parallel resonance, impedance equals resistance. Inductive reactance isn't the impedance.
Option C: Incorrect. Low compared to circuit resistance isn't correct - at parallel resonance, impedance is high (equal to R). Low isn't correct.
Option D: Incorrect. High compared to circuit resistance isn't correct - at parallel resonance, impedance equals resistance. High isn't correct.
题目解析
The correct answer is A: Approximately equal to circuit resistance. What is the magnitude of the impedance of a parallel RLC circuit at resonance is approximately equal to circuit resistance. At parallel resonance, impedance is maximum and approximately equal to R. For amateur radio operators, this is important for circuit theory. Understanding this helps when working with resonant circuits.
考试技巧
Parallel RLC impedance at resonance = approximately equal to circuit resistance. Think 'P'arallel 'R'LC at 'R'esonance = 'R'esistance. At parallel resonance, impedance is maximum and approximately equal to R. Not inductive reactance, not low, not high - just approximately equal to resistance.
记忆口诀
Parallel RLC impedance at resonance = approximately equal to circuit resistance. Think 'P'arallel 'R'LC at 'R'esonance = 'R'esistance. At parallel resonance, impedance is maximum and approximately equal to R. Important for circuit theory.
实际应用示例
A parallel RLC circuit at resonance: The impedance magnitude is approximately equal to the circuit resistance. At parallel resonance, the impedance is maximum and approximately equal to R. This is the impedance - approximately equal to resistance.
错误选项分析
Option B: Incorrect. Approximately equal to inductive reactance isn't correct - at parallel resonance, impedance equals resistance. Inductive reactance isn't the impedance. Option C: Incorrect. Low compared to circuit resistance isn't correct - at parallel resonance, impedance is high (equal to R). Low isn't correct. Option D: Incorrect. High compared to circuit resistance isn't correct - at parallel resonance, impedance equals resistance. High isn't correct.
知识点
Impedance, Parallel RLC circuit, At resonance, Approximately equal to circuit resistance
Verified Content
Question from official FCC Extra Class question pool. Explanation reviewed by licensed amateur radio operators.