817-6 Writing a set of normal form equations 1. Establish a normal tree tree branches -,, C(oa,R cot ree(chords)-io,l(ia, r) 2. Assign voltage and current variables. Assign a voltage (with polarity reference) to every capacitor and a current(with arrow) to every inductor; there are the state variables Indicate the voltage across every tree branch and the current through every link in terms of the source voltages, source currents, and the state variables, if possible; otherwise assign a new voltage or current variable to that resistive tree branch or link§17-6 Writing a set of normal form equations 1. Establish a normal tree.    − − − cot ( ) , ( , ) , ( , ) ree chords i L i R tree branches C R s d  s d 2. Assign voltage and current variables. Assign a voltage (with polarity reference) to every capacitor and a current (with arrow) to every inductor; there are the state variables.Indicate the voltage across every tree branch and the current through every link in terms of the source voltages, source currents,and the state variables, if possible; otherwise, assign a new voltage or current variable to that resistive tree branch or link