Thevenin equivalent

Discussion in 'Homework Help' started by TwoPlusTwo, Feb 20, 2011.

  1. TwoPlusTwo

    Thread Starter Member

    Oct 14, 2010
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    I'm supposed to find the Thevenin equivalent external to the resistor R in the image below. For Rth I got 2.5 ohm. Is that right?

    And how do I find Eth?
     
  2. Jony130

    AAC Fanatic!

    Feb 17, 2009
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    Well I get Rth = 7.5Ω.
    To find Vth remove load resistor (R) and find the voltage across open load terminal.
     
  3. TwoPlusTwo

    Thread Starter Member

    Oct 14, 2010
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    Yeah, my Rth was 5 + 2.5, not 2.5, so I also get 7.5. But I don't quite understand how to find the voltage across an open terminal..
     
  4. Jony130

    AAC Fanatic!

    Feb 17, 2009
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    Maybe this diagram will help
     
    Last edited: Feb 20, 2011
  5. TwoPlusTwo

    Thread Starter Member

    Oct 14, 2010
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    Thanks, but it's still not clear to me. My guess from this is that Eth=10V. Is that right by any chance?
     
  6. Jony130

    AAC Fanatic!

    Feb 17, 2009
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    Bullseye :) Vth=10V
     
  7. TwoPlusTwo

    Thread Starter Member

    Oct 14, 2010
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    Cool. Maybe I did get it after all :)
     
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