Each four-terminal element will be described by two voltage variables and two
current variables – one voltage variable and one current variable per terminal pair. Two
relations tying up or constraining these variables will be available for each such
four- terminal element. For instance, consider a voltage-controlled voltage source. There
is an open-circuit across its first terminal pair and a voltage source across its second
terminal pair.
We treat each four-terminal element as two two-terminal elements with some relation
between their voltage/current variables, as far as element count in a circuit is concerned. Let
there be b-elements, n-nodes and ...
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