
In electrical engineering and science, an equivalent circuit refers to a theoretical circuit that retains all of the electrical characteristics of a given circuit. Often, an equivalent circuit is sought that simplifies calculation, and more broadly, that is a simplest form of a more complex circuit in order to aid analysis. In its most common form...
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http://en.wikipedia.org/wiki/Equivalent_circuit

arrangement of ideal circuit elements that has circuit parameters, over a range of interest, electrically equivalent to those of a particular circuit or device NOTE - For analysis the equivalent circuit replaces a more complicated circuit or device.
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http://www.electropedia.org/iev/iev.nsf/display?openform&ievref=521-05-35

the electrical circuit which has the same impedance as a piezoelectric resonator in the immediate neighbourhood of resonance NOTE - It consists of series elements L
1, C
1, R
1, in parallel with C
0 to where L
1, C
1, ...
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http://www.electropedia.org/iev/iev.nsf/display?openform&ievref=561-02-07
No exact match found.