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Open-circuit Req Circuit

Discussion in 'Electronics Homework Help' started by Jermgilbert, Sep 10, 2020.

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  1. Jermgilbert

    Jermgilbert

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    0
    Sep 10, 2020
    I need assistance with this problem. I cannot seem to figure it out.
     

    Attached Files:

  2. Jermgilbert

    Jermgilbert

    4
    0
    Sep 10, 2020
    I have tried to put it into LTspice, but cannot get it to run. I have tried grounding the open circuit ends, but that doesn't seem to work.
     
  3. Harald Kapp

    Harald Kapp Moderator Moderator

    11,513
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    Nov 17, 2011
    You need one single ground only. Using multiple grounds will short circuit these parts of the circuit. Show us your LTSPICE diagram or upload the .asc file for inspection.

    Provided you get the simulation up and running: how will you determine the equivalent resistance from the simulation?
     
  4. Jermgilbert

    Jermgilbert

    4
    0
    Sep 10, 2020
    Could I add a resistor at the end of the wires and find the total resistance that way?
     

    Attached Files:

  5. Harald Kapp

    Harald Kapp Moderator Moderator

    11,513
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    Nov 17, 2011
    No.
    What is the usual way to determine the resistance of a component? Hint: what is the equation for R = ??? in terms of voltage and current?
     
  6. Jermgilbert

    Jermgilbert

    4
    0
    Sep 10, 2020
    Oh, alright I could insert a voltage source.
     
  7. Harald Kapp

    Harald Kapp Moderator Moderator

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    Nov 17, 2011
    Good. Where? And what's next?
     
  8. Ratch

    Ratch

    1,093
    334
    Mar 10, 2013
    Ridiculously simple. Redraw the circuit.
    Capture.JPG

    Then use any generic equation solver or pencil and paper to solve the loop equations with a 1 volt source.



    Capture2.JPG

    1 volt gives 1/25 amp so the resistance is 25 ohms.

    Ratch
     
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