What is the magnitude of the current at the input of a parallel RLC circuit at resonance?
The correct answer is A: Minimum. What is the magnitude of the current at the input of a parallel RLC circuit at resonance is minimum. At parallel resonance, input current is minimum (impedance is maximum). For amateur radio operators, this is important for circuit theory. Understanding this helps when working with resonant circuits.
Exam Tip
Parallel RLC input current at resonance = minimum. Think 'P'arallel 'R'LC at 'R'esonance = 'M'inimum 'I'nput current. At parallel resonance, input current is minimum (impedance is maximum). Not maximum, not R/L, not L/R - just minimum.
Memory Aid
"Parallel RLC input current at resonance = minimum. Think 'P'arallel 'R'LC = 'M'inimum input. At parallel resonance, input current is minimum (impedance is maximum). Important for circuit theory."
Real-World Application
A parallel RLC circuit at resonance: The current at the input is minimum. This is because at parallel resonance, the impedance is maximum, so for a given voltage, the current is minimum. This is the magnitude - minimum input current.
Key Concepts
Why Other Options Are Wrong
Option B (Maximum): Incorrect. Maximum isn't correct - at parallel resonance, input current is minimum. Maximum is wrong.
Option C (R/L): Incorrect. R/L isn't the answer - input current is minimum at resonance. R/L isn't the answer.
Option D (L/R): Incorrect. L/R isn't the answer - input current is minimum at resonance. L/R isn't the answer.
题目解析
The correct answer is A: Minimum. What is the magnitude of the current at the input of a parallel RLC circuit at resonance is minimum. At parallel resonance, input current is minimum (impedance is maximum). For amateur radio operators, this is important for circuit theory. Understanding this helps when working with resonant circuits.
考试技巧
Parallel RLC input current at resonance = minimum. Think 'P'arallel 'R'LC at 'R'esonance = 'M'inimum 'I'nput current. At parallel resonance, input current is minimum (impedance is maximum). Not maximum, not R/L, not L/R - just minimum.
记忆口诀
Parallel RLC input current at resonance = minimum. Think 'P'arallel 'R'LC = 'M'inimum input. At parallel resonance, input current is minimum (impedance is maximum). Important for circuit theory.
实际应用示例
A parallel RLC circuit at resonance: The current at the input is minimum. This is because at parallel resonance, the impedance is maximum, so for a given voltage, the current is minimum. This is the magnitude - minimum input current.
错误选项分析
Option B (Maximum): Incorrect. Maximum isn't correct - at parallel resonance, input current is minimum. Maximum is wrong. Option C (R/L): Incorrect. R/L isn't the answer - input current is minimum at resonance. R/L isn't the answer. Option D (L/R): Incorrect. L/R isn't the answer - input current is minimum at resonance. L/R isn't the answer.
知识点
Current at input, Parallel RLC circuit, At resonance, Minimum
Verified Content
Question from official FCC Extra Class question pool. Explanation reviewed by licensed amateur radio operators.