Where is the impedance of a pure resistance plotted on rectangular coordinates?
The correct answer is D: On the horizontal axis. Where is the impedance of a pure resistance plotted on rectangular coordinates is on the horizontal axis. Pure resistance has no reactance, so it's on the real (horizontal) axis. For amateur radio operators, this is important for circuit theory. Understanding this helps when plotting impedances.
Exam Tip
Pure resistance on rectangular coordinates = on horizontal axis. Think 'P'ure 'R'esistance = 'P'ositive 'R'eal axis (horizontal). Pure resistance has no reactance, so it's on the real (horizontal) axis. Not vertical, not 45°, not offset - just horizontal axis.
Memory Aid
"Pure resistance on rectangular coordinates = on horizontal axis. Think 'P'ure 'R'esistance = 'H'orizontal axis. Pure resistance has no reactance, so it's on the real (horizontal) axis. Important for circuit theory."
Real-World Application
The impedance of a pure resistance plotted on rectangular coordinates: It's on the horizontal axis. Since pure resistance has no reactance (imaginary part = 0), it lies on the real axis, which is the horizontal axis. This is where it's plotted - on the horizontal axis.
Key Concepts
Why Other Options Are Wrong
Option A: Incorrect. On vertical axis isn't correct - pure resistance is on horizontal axis. Vertical axis is wrong.
Option B: Incorrect. On line through origin slanted at 45 degrees isn't correct - pure resistance is on horizontal axis. 45° line is wrong.
Option C: Incorrect. On horizontal line offset vertically isn't correct - pure resistance is on horizontal axis at origin. Offset isn't correct.
题目解析
The correct answer is D: On the horizontal axis. Where is the impedance of a pure resistance plotted on rectangular coordinates is on the horizontal axis. Pure resistance has no reactance, so it's on the real (horizontal) axis. For amateur radio operators, this is important for circuit theory. Understanding this helps when plotting impedances.
考试技巧
Pure resistance on rectangular coordinates = on horizontal axis. Think 'P'ure 'R'esistance = 'P'ositive 'R'eal axis (horizontal). Pure resistance has no reactance, so it's on the real (horizontal) axis. Not vertical, not 45°, not offset - just horizontal axis.
记忆口诀
Pure resistance on rectangular coordinates = on horizontal axis. Think 'P'ure 'R'esistance = 'H'orizontal axis. Pure resistance has no reactance, so it's on the real (horizontal) axis. Important for circuit theory.
实际应用示例
The impedance of a pure resistance plotted on rectangular coordinates: It's on the horizontal axis. Since pure resistance has no reactance (imaginary part = 0), it lies on the real axis, which is the horizontal axis. This is where it's plotted - on the horizontal axis.
错误选项分析
Option A: Incorrect. On vertical axis isn't correct - pure resistance is on horizontal axis. Vertical axis is wrong. Option B: Incorrect. On line through origin slanted at 45 degrees isn't correct - pure resistance is on horizontal axis. 45° line is wrong. Option C: Incorrect. On horizontal line offset vertically isn't correct - pure resistance is on horizontal axis at origin. Offset isn't correct.
知识点
Impedance of pure resistance, Rectangular coordinates, On horizontal axis, Impedance plotting
Verified Content
Question from official FCC Extra Class question pool. Explanation reviewed by licensed amateur radio operators.