Amateur ExtraE5C07
Where is the impedance of a pure resistance plotted on rectangular coordinates?
D
Answer
Electrical principles and calculations
Type
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
Answer Notes
In a rectangular coordinate system used for electrical impedance, the graph is plotted on a complex plane. The horizontal axis (X-axis) represents the real part of the impedance, which is the pure resistance.
The vertical axis (Y-axis) represents the imaginary part, which is the reactance (inductive or capacitive). Because a pure resistance has zero reactance, its Y-coordinate is zero, placing the plot exactly on the horizontal axis. Distractors suggesting a 45-degree angle or vertical axis describe circuits that contain reactance, not pure resistance.
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What coordinate system is often used to display the phase angle of a circuit containing resistance, inductive, and/or capacitive reactance?