What does the impedance 50 - j25 ohms represent?
The correct answer is B: 50 ohms resistance in series with 25 ohms capacitive reactance. What does the impedance 50 - j25 ohms represent is 50 ohms resistance in series with 25 ohms capacitive reactance. Rectangular form R - jX means resistance in series with capacitive reactance. For amateur radio operators, this is important for circuit theory. Understanding this helps when interpreting impedance.
Exam Tip
Impedance 50 - j25 ohms = 50 ohms resistance in series with 25 ohms capacitive reactance. Think 'R' - 'j'X = 'R'esistance in series with 'C'apacitive reactance. Rectangular form R - jX means resistance in series with capacitive reactance. Not inductive, not swapped values - just 50Ω R, 25Ω capacitive.
Memory Aid
"Impedance 50 - j25 ohms = 50 ohms resistance in series with 25 ohms capacitive reactance. Think 'R' - 'j'X = 'R'esistance + 'C'apacitive. Rectangular form R - jX means resistance in series with capacitive reactance. Important for circuit theory."
Real-World Application
The impedance 50 - j25 ohms: It represents 50 ohms resistance in series with 25 ohms capacitive reactance. The real part (50) is resistance, and the negative imaginary part (-j25) is capacitive reactance. This is what it represents - 50Ω R, 25Ω capacitive.
Key Concepts
Why Other Options Are Wrong
Option A: Incorrect. 50 ohms resistance in series with 25 ohms inductive reactance isn't correct - 50 - j25 is capacitive (negative j), not inductive. Inductive isn't correct.
Option C: Incorrect. 25 ohms resistance in series with 50 ohms inductive reactance isn't correct - 50 - j25 is 50Ω resistance and 25Ω capacitive. 25Ω/50Ω swap isn't correct.
Option D: Incorrect. 25 ohms resistance in series with 50 ohms capacitive reactance isn't correct - 50 - j25 is 50Ω resistance and 25Ω capacitive. 25Ω/50Ω swap isn't correct.
题目解析
The correct answer is B: 50 ohms resistance in series with 25 ohms capacitive reactance. What does the impedance 50 - j25 ohms represent is 50 ohms resistance in series with 25 ohms capacitive reactance. Rectangular form R - jX means resistance in series with capacitive reactance. For amateur radio operators, this is important for circuit theory. Understanding this helps when interpreting impedance.
考试技巧
Impedance 50 - j25 ohms = 50 ohms resistance in series with 25 ohms capacitive reactance. Think 'R' - 'j'X = 'R'esistance in series with 'C'apacitive reactance. Rectangular form R - jX means resistance in series with capacitive reactance. Not inductive, not swapped values - just 50Ω R, 25Ω capacitive.
记忆口诀
Impedance 50 - j25 ohms = 50 ohms resistance in series with 25 ohms capacitive reactance. Think 'R' - 'j'X = 'R'esistance + 'C'apacitive. Rectangular form R - jX means resistance in series with capacitive reactance. Important for circuit theory.
实际应用示例
The impedance 50 - j25 ohms: It represents 50 ohms resistance in series with 25 ohms capacitive reactance. The real part (50) is resistance, and the negative imaginary part (-j25) is capacitive reactance. This is what it represents - 50Ω R, 25Ω capacitive.
错误选项分析
Option A: Incorrect. 50 ohms resistance in series with 25 ohms inductive reactance isn't correct - 50 - j25 is capacitive (negative j), not inductive. Inductive isn't correct. Option C: Incorrect. 25 ohms resistance in series with 50 ohms inductive reactance isn't correct - 50 - j25 is 50Ω resistance and 25Ω capacitive. 25Ω/50Ω swap isn't correct. Option D: Incorrect. 25 ohms resistance in series with 50 ohms capacitive reactance isn't correct - 50 - j25 is 50Ω resistance and 25Ω capacitive. 25Ω/50Ω swap isn't correct.
知识点
Impedance, 50 - j25 ohms, 50 ohms resistance, 25 ohms capacitive reactance, In series
Verified Content
Question from official FCC Extra Class question pool. Explanation reviewed by licensed amateur radio operators.