ECEN 215, Principles of Electrical EngineeringDr. Mina RahimianLecture# 11 Date: 9/30/13The step response of an RL circuitThe behavior of the circuit after being connected to a source is called step response.The step response of an RC circuitGeneral solution for step and natural responsesFor computing the step or natural response of RL and RC circuits follow these steps:1. Identify the variable of interest. Choose inductor current in an RL and capcitor voltage in an RC circuit.2. Determine the initial value of the variable using the circuit before switching when all inductors are short and capacitors are open at steady state.3. Determine the final vaule of the variable using the circuit after switching when all inductors are short and capacitors are open at steady state.4. Calculate the time constant by finding the equivalnt resistance connected to the inductor or capacitor in the circuit after switching. (Ƭ= L/R in an RL circuit and Ƭ = RC in an RC circuit)5. Use this general equation to find the expression for the
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