Question
Where is the impedance of a pure resistance plotted on rectangular coordinates?
Answer Options
- A) On the vertical axis
- B) On a line through the origin, slanted at 45 degrees
- C) On a horizontal line, offset vertically above the horizontal axis
- D) On the horizontal axis
Correct Answer: D
Explanation
Rectangular coordinates are used to plot complex impedance, where the horizontal (X) axis represents the resistive component (R) and the vertical (Y) axis represents the reactive component (jX). Any impedance point is located by its coordinates (R, X).
For a pure resistance, the reactive component (X) is zero (Z = R + j0). This means the impedance has no component on the vertical axis. Therefore, the impedance of a pure resistance is always plotted directly on the horizontal axis (the R-axis) at the point corresponding to its value in ohms.
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