model RLCircuit
  Real uL,iR1,iR2,phi(start=1),iL;
  parameter Real R1=1,R2=1,L=1;
equation
  uL-R1*iR1=0;
  uL-R2*iR2=0;
  der(phi)-uL=0;
  phi-L*iL=0;
  iL+iR1+iR2=0;
end RLCircuit;