The most general model for a branch in a network is shown in Fig. 17.11-1.
This combination of a passive impedance in series with a voltage source with a cur-
rent source paralleling the series combination is represented by a branch in the network
graph. The branch voltage variable is v
k
and the branch current variable is i
k
. These are the
variables that enter the KVL and KCL equations, respectively. v
pk
is the voltage variable
across the passive impedance component in the k
th
generalised branch and i
pk
is the corre-
sponding current variable as per the passive sign convention. v
gk
is the source voltage in
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