Formula sheet Mechanical building blocks Spring = Dashpot = Mass = Electrical building blocks = 1 = Capacitor d = Resistor = = Inductor 1 = d d d First-order system Standard form + = Step response Characteristic parameters 1 = = Second-order system Standard form Step response (underdamped) Characteristic parameters = = + ( cos = + + 4 + sin ) 2 = , = , = = = = 1 4 3 overshoot = exp × 1