Example
Consider the problem of finding for the circuit in Figure 1 using the EET (note all component values are unity for simplicity). If the capacitor (gray shading) is denoted the extra element then
Removing this capacitor from the circuit we find
Calculating the impedance seen by the capacitor with the input shorted we find
Calculating the impedance seen by the capacitor with the input open we find
Therefore using the EET, we find
Note that this problem was solved by calculating three simple driving point impedances by inspection.
Read more about this topic: Extra Element Theorem, Driving Point Impedances
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