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AC Electricity : Resistance, Reactance, and Impedance

Second Part of AC Electricity for Industrial Instrumentation Series RMS Quantities - First

Resistance (R) is the dissipative opposition to an electric current, analogous to friction encountered by a moving object. Reactance (X) is the opposition to an electric current resulting from energy storage within circuit components, analogous to inertia of a moving object. Impedance (Z) is the combined total opposition to an electric current.

Reactance comes in two opposing types: capacitive (XC) and inductive (XL). Each one is a function of frequency (f) in an AC circuit:

 

 

Resistance_Reactance_Impedance_Fig_016.JPG

 

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