*Question E5C09:
When using rectangular coordinates to graph the impedance of a circuit, what do the axes represent?*  

*Correct Answer is  A: The X axis represents the resistive component, and the Y axis represents the reactive component*  

### AI Response: (may contain errors)  

When graphing the impedance of a circuit using rectangular coordinates, the axes represent different components of the impedance.

### Correct Answer Explanation:
- **Correct Answer: A**  
  The X axis represents the resistive component (real part) of the impedance, while the Y axis represents the reactive component (imaginary part). This is a standard way to represent complex numbers, where impedance is often expressed as:
  
  $$Z = R + jX$$
  
  where:
  - $Z$ = total impedance
  - $R$ = resistive component (real part)
  - $X$ = reactive component (imaginary part)
  - $j$ = imaginary unit

### Why Other Choices Are Incorrect:
- **Choice B**: The X axis represents the reactive component, and the Y axis represents the resistive component.  
  This is incorrect because it reverses the standard representation of impedance in rectangular coordinates.

- **Choice C**: The X axis represents the phase angle, and the Y axis represents the magnitude.  
  This is incorrect because phase angle and magnitude are typically represented in polar coordinates, not rectangular coordinates.

- **Choice D**: The X axis represents the magnitude, and the Y axis represents the phase angle.  
  This is also incorrect for the same reason as Choice C; magnitude and phase angle are not represented in rectangular coordinates.

### Summary:
- In rectangular coordinates:
  - X axis = Resistive component ($R$)
  - Y axis = Reactive component ($X$)
  
Understanding this representation is crucial for analyzing circuits and their impedance characteristics effectively.