The TwoPort resistive field has free causality.
Potential variables: e1: Bondgraphic effort variable of inflow f1: Bondgraphic flow variable of inflow, normalized positive for flows into the model e2: Bondgraphic effort variable of outflow f2: Bondgraphic flow variable of outflow, normalized positive for flows into the model Parameters: R1: Primary resistance (default value = 1) R2: Secondary resistance (default value = 1) R12: Coupling resistance (default value = 0)
Equations:
e1 = R1*f1 + R12*f2
e2 = R12*f1 + R2*f2