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What is the total resistance?

  1. Apr 22, 2017 #1
    1. The problem statement, all variables and given/known data
    In the circuit attached below, what's the resistance between A and B?

    2. Relevant equations


    3. The attempt at a solution
    I'm finding it difficult to interpret this thing. Are resistors 1 and 2 in series or parallel? What does the loop above 1 and 2 actually do, in terms of how much current would flow round it? It has no components in it. I really have no idea what's going on in the diagram.

    I'm guessing it involves Kirchhoff's current and voltage laws but I'm struggling to actually apply those here. Thanks for any help!
     

    Attached Files:

    Last edited: Apr 22, 2017
  2. jcsd
  3. Apr 22, 2017 #2

    phinds

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    2016 Award

    This exact problem has shown up here several times. You need to just pay attention to the definitions of serial and parallel connections and redraw the circuit. That is that POINT of the exercise, actually, more than the answer. It's to force you to pay close attention to the definitions.
     
  4. Apr 22, 2017 #3
    Are these just all in parallel??? If I removed either of those loops I'd say what was left was three resistors in parallel, but what happens when there are two loops? Still just in parallel?
     
  5. Apr 22, 2017 #4

    phinds

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    2016 Award

    Yes, it's rather trivial to note that each of the resistors has one end hooked to the input and one to the output so they are obviously in parallel. You'll need to define what you mean by "two loops" to get an answer to that, but if you draw the diagram properly it will be obvious in any case.
     
  6. Apr 22, 2017 #5
    I see it, thank you! :)
     
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