Q: Square Wave through series RL

Discussion in 'Homework Help' started by andrewintejas, Dec 7, 2014.

  1. andrewintejas

    Thread Starter New Member

    Sep 20, 2014
    8
    0
    I have a question about the attached RL circuit, which produces the corresponding voltage graph under the influence of a square wave.

    As you can see in the voltage graph, there's a discontinuous voltage jump to negative for the Inductor when the step voltage turns off. Is there an implicit current direction change in the circuit occurring with the square wave 0 state? An intuitive reason for the polarity change in the inductor is otherwise escaping me.

    Thanks
     
  2. ScottWang

    Moderator

    Aug 23, 2012
    4,855
    767
    You can see this animator for coil, you will also know why the relay need a diode for back emf.
     
    absf likes this.
  3. andrewintejas

    Thread Starter New Member

    Sep 20, 2014
    8
    0
    Thanks guys!
     
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