Deep Dive: E5C09
The correct answer is A: The X axis represents the resistive component, and the Y axis represents the reactive component. When using rectangular coordinates to graph the impedance of a circuit, what do the axes represent is that the X axis represents the resistive component, and the Y axis represents the reactive component. X-axis = resistance, Y-axis = reactance. For amateur radio operators, this is important for circuit theory. Understanding this helps when plotting impedances.
Why Other Answers Are Wrong
Option B: Incorrect. X axis reactive and Y axis resistive isn't correct - X axis is resistive, Y axis is reactive. Swapped is wrong. Option C: Incorrect. X axis phase angle and Y axis magnitude isn't correct - that's polar, not rectangular. Phase/magnitude is polar. Option D: Incorrect. X axis magnitude and Y axis phase angle isn't correct - that's polar, not rectangular. Magnitude/phase is polar.
Exam Tip
Rectangular coordinates axes = X axis resistive, Y axis reactive. Think 'R'ectangular = 'R'esistance on 'X', 'R'eactance on 'Y'. X-axis = resistance, Y-axis = reactance. Not swapped, not phase/magnitude (polar) - just X=resistance, Y=reactance.
Memory Aid
Rectangular coordinates axes = X axis resistive, Y axis reactive. Think 'R'ectangular = 'X'='R'esistance, 'Y'='R'eactance. X-axis = resistance, Y-axis = reactance. Important for circuit theory.
Real-World Example
Using rectangular coordinates to graph impedance: The X axis represents the resistive component, and the Y axis represents the reactive component. For example, 50 + j25 would be plotted at X=50, Y=25. This is what the axes represent - X=resistance, Y=reactance.
Source & Coverage
Question Pool: 2024-2028 Question Pool
Subelement: E5C
Reference: 2024-2028 Question Pool · E5 - Electrical Principles
Key Concepts
Verified Content
Question from the official FCC Extra Class pool. Explanation reviewed by licensed amateur radio operators and mapped to the E5C topic.