Circuit Elements to Use in Models
The equivalent-circuit elements that can be used in the Modeler are shown below. Equations for both the admittance and impedance are given for each element.
Symbol Circuit Element (alphabetical symbol) Admittance Impedance 
Resistor (R) 1/R R 
Capacitor (C) 
Inductor (L) 
Constant Phase Element (Q) 
Infinite Warburg (W) 
Porous Bounded Warburg (O) 
Bounded Warburg (T) 
Gerischer Impedance (G) 
The dependent variables used in these equations are R, C, L, Y0, KA , B, and α. The Electrochemical Impedance Spectroscopy software uses these as fit parameters.
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