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Math Help - Simple circuit analysis Q

  1. #1
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    Simple circuit analysis Q

    The question


    I want to find the node voltages via KCL.

    I seem to have forgotten what to do when there's a resistor in series with a voltage source. e.g. with node v3, to find the current entering the node from the lower branch, normally I'd use V/R (i.e. v3/5). However there's a 1v voltage source on the branch. How do I work with that?

    Thanks.
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  2. #2
    A Plied Mathematician
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    Re: Simple circuit analysis Q

    Quote Originally Posted by Glitch View Post
    The question


    I want to find the node voltages via KCL.

    I seem to have forgotten what to do when there's a resistor in series with a voltage source. e.g. with node v3, to find the current entering the node from the lower branch, normally I'd use V/R (i.e. v3/5). However there's a 1v voltage source on the branch. How do I work with that?

    Thanks.
    The short answer is that it's another node. Basically, you need two more nodes: one between the 2V source and the 1 ohm resistor with i6 going through it, and another one between 5 ohm resistor with i5 going through it and the 1V source.

    Incidentally, don't forget to use supernodes for your dependent sources. Come to think of it, that may be the best technique for handling those voltage sources anyway.
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  3. #3
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    Re: Simple circuit analysis Q

    Thanks!
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  4. #4
    A Plied Mathematician
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    Re: Simple circuit analysis Q

    You're welcome. If you have any further difficulties, let us know.
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