Can't find unkown resistor value in series-parallel circuit

Discussion in 'Homework Help' started by Xannolc, Oct 13, 2017 at 7:30 AM.

  1. Xannolc

    Thread Starter New Member

    Thursday
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    0
    Good day all. I find myself stumped on what i expected to be an easy question. My issue is with the unknown resistor value in the attached documents. I've tried working it out multiple times but i always seem to be missing something. If anybody could help nudge me in the right direction, that would really be appreciated. I've attempted working out the other questions but everything seems to revolve around that one component. Hopefully I'm just overthinking things and overlooking a tiny detail.
     
  2. BR-549

    Distinguished Member

    Sep 22, 2013
    3,047
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    The first image is impossible to read.
     
  3. bertus

    Administrator

    Apr 5, 2008
    17,113
    3,001
    Hello,

    I used the levels function of the GIMP, to get a somewhat better viewable image:

    Xannol_20171013_131328_corr.jpg

    Bertus
     
  4. Xannolc

    Thread Starter New Member

    Thursday
    2
    0
    Sorry about that. hopefully this helps
     
  5. dl324

    Distinguished Member

    Mar 30, 2015
    4,954
    1,061
    Label your answers with the corresponding labels used in the question.

    Check your work on the answer that resulted in a negative resistance.
     
  6. WBahn

    Moderator

    Mar 31, 2012
    20,221
    5,747
    You have near the top of your work Ir = It * r = 1 * 2 = 2A

    What is Ir? How is a current multiplied by a resistance equal to a resistance? Where is it that you are claiming that 2 A is flowing in this circuit?

    Where does the claim that Rparallel = 6Ω - 4Ω come from?
     
  7. RBR1317

    Active Member

    Nov 13, 2010
    398
    77
    This is how I would label the circuit diagram prior to making any calculations...
     
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