Dismiss Notice
Join Physics Forums Today!
The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

Trick Resistors Combination

  1. Jul 15, 2008 #1

    I have a tricky problem with resistors combination.

    please check this url - http://www.disruptedstreets.com/physics.png [Broken]

    Can anybody help me with this?


    The Question is -

    Calculate the Current at Point X and potential difference between points A and B.
    Last edited by a moderator: May 3, 2017
  2. jcsd
  3. Jul 15, 2008 #2
    looks to me like R1, R2, R3 are in parallel and the pot. difference between A and B is that provided by the battery.
  4. Jul 15, 2008 #3
    yes me too

    but some said .... there is a short circuit. but i don't know where is it ... :( and that's why i'm confused.
  5. Jul 15, 2008 #4
    What does "X" represent?
  6. Jul 15, 2008 #5
    "X" is the current at that point. We need to find the current ( I ) at "X". AND potential difference ( V ) between "A" and "B".
  7. Jul 15, 2008 #6
    Oh sorry I Forgot. The battery is 2V.
  8. Jul 15, 2008 #7


    User Avatar
    Homework Helper

    I don't see any short-circuit. But in any case as jablonsky27 has noted, the three resistors are all in parallel. That should simplify the problem tremendously.
  9. Jul 16, 2008 #8
    yea me too.. but.. there is another fault. the polarities of the battery is wrong .. positive is up and negative is down

    can you please calculate the answers for me ?
  10. Jul 16, 2008 #9


    User Avatar
    Staff Emeritus
    Science Advisor
    Gold Member

    Turn the paper over.


    Compute the total resistance, apply Ohms law.
  11. Jul 16, 2008 #10
    ok thanks.
Share this great discussion with others via Reddit, Google+, Twitter, or Facebook