Electrical Exam Term
Impedance
The total opposition to current flow in an AC circuit, combining resistance and reactance, measured in ohms.
Detailed Explanation
Unlike pure DC resistance, impedance in AC circuits includes the effects of inductance and capacitance, which create reactance. Impedance affects voltage drop calculations, transformer sizing, and fault current calculations. Motors, transformers, and long conductor runs all introduce impedance. In three-phase systems, impedance calculations are essential for determining system performance and equipment sizing.
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Practice QuestionEasy
Which of the following best describes the concept of Impedance?
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