 ##  [Electrical Impedance](/electrical-impedance) 

  ##  [Electrical Impedance](https://engineering.quantumdictionary.io/electrical-impedance-0) 

  
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**Engineering &amp; Applied Technologies Dictionary**

 
Definition

The complex, frequency‑dependent quantity Z(ω) = R + jX that relates phasor voltage V(ω) to phasor current I(ω) by V = Z·I in linear time‑invariant circuits; it combines resistive (real) and reactive (imaginary) opposition to alternating current and requires specification of frequency and reference terminals.