Hi.. This is sundaram, I'm trying to learn state space modeling, I'm trying to model the simple RL series circuit, to control/read the current flowing through inductor. I could find the way to monitor the voltage across inductor. as below x'=(u - Rx)*(1/L) y=(u - Rx) where: x => i (current), x' => di/dt R=> resistance & L=> inductance u is the applied voltage y=> the voltage across inductor can any one help me in framing the state space equation to control I Thanks in advance..! Sundaram..