AC Impedance

Last updated: December 23, 2018

What Does AC Impedance Mean?

AC impedance is the gauge of opposition a circuit presents to current each time a voltage is applied. In a more quantitative sense, it is the ratio of voltage to current within alternating current. Impedance can be extended to the idea of AC circuit resistance and include both phase and magnitude.

It is very important to understand the concept of AC impedance to promote the proper load in electrical circuits, preventing and monitoring non-beneficial electrical activity that could lead to damage, interruption and in some cases, corrosion.


Corrosionpedia Explains AC Impedance

AC impedance in circuits must be understood clearly as there are two extra impending processes that should be looked into apart from the usual DC circuit resistance.These are:

  • Voltage induction in conductors induced by current magnetic fields
  • Electrostatic storing of charge prompted by voltages between conductors

The impedance that is produced by these two mechanisms is collectively known as "reactance," which builds the imaginary portion of complex impedance where resistance is involved as one of the parts.

AC impedance, therefore, is the frequency domain in the ratio of current and voltage. It can also be more accurately described as the ratio of voltage to current for one complex exponential at a specific frequency.


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