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Homework Help: An equivalent resistor problem

  1. May 1, 2013 #1
    1. The problem statement, all variables and given/known data
    Hey, I've always had problems with circuits and finding out equivalent resistors, and identifyuing which are in parallel, and which are not

    2. Relevant equations

    I need help with the circuit attached. Can someone clear this problem with circuits once and for all.
    PS: I have read a lot of books. From the best professors.
    Saying read a book won't help

    3. The attempt at a solution

    Attached Files:

  2. jcsd
  3. May 1, 2013 #2


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    Staff: Mentor

    Try to find another shape for the resistors, where the symmetry is easier to see. Hint: The uppermost two resistors have a similar role in the modified graph.

    There is no general rule to find those simplifications everywhere - you just have to try something, and see if it works. You can always solve it with Kirchhoff's laws, but that is not necessary here.
  4. May 1, 2013 #3
    Hey, thanks for the response

    I've spent an hour on it, and have one no where.
    It'd be great if someone could solve it for me.
  5. May 1, 2013 #4
    Nope, no one would do that for you here.

    Mark the nodes with the alphabets and try to make a simplified circuit.
  6. May 1, 2013 #5
    @Pranav Arora

    It's people like you who make me hate forums.
    With all due respect, Either answer, or don't.
    Don't be a smartass.
  7. May 1, 2013 #6
    As you wish. No one else would help you until you show your attempts.
  8. May 1, 2013 #7
    What part of 'I tried almost for an hour' don't you understand.
  9. May 1, 2013 #8


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    Staff: Mentor

    When you registered for Physics Forums you agreed to abide by the forum rules, including the requirement to show some work on your own attempt in tangible form. It is strictly against forum rules to directly answer homework questions for you. Hints, yes. Guidance, yes. Checking your work, yes. Pointing out errors, yes. Doing your homework for you, no.

    You might want to review these guidelines for asking homework questions.
  10. May 1, 2013 #9

  11. May 1, 2013 #10


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    2017 Award

    Staff: Mentor

    In that one hour, you should have produced a lot of things. Feel free to show them. It helps us to see where the problem is.

    You won't learn much if we solve the problem for you. There are tons of solved problems in the internet, if you want to look how those problems can be solved in general. The idea of homework is that you solve it to learn how to do it.
  12. May 1, 2013 #11


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    Science Advisor
    Homework Helper
    Gold Member


    Take the "middle resistor" and turn it horizontal.
  13. May 1, 2013 #12
    Okay, I get my mistake.
    I'm completely new to this, and I had no idea how it worked.
    My apologies to all.
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