1. Not finding help here? Sign up for a free 30min tutor trial with Chegg Tutors
    Dismiss Notice
Dismiss Notice
Join Physics Forums Today!
The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

Total resistance through cubic circuit

  1. Oct 7, 2008 #1
    1. The problem statement, all variables and given/known data

    Suppose a resistor R lies along each edge of a cube (12 resistors in all) with connections at the corners. Find the equivalent resistance between two diagonally opposite corners of the cube


    2. Relevant equations

    [tex]\Sigma[/tex]I = 0 at a node (a junction)

    [tex]\Sigma[/tex]V = 0 through a loop

    V=IR

    3. The attempt at a solution


    Not quite sure how to do this one algebraically. Would I just add up all the V/Is? how?
     
  2. jcsd
  3. Oct 7, 2008 #2
    Not quite sure where to start...can anyone help me?
     
  4. Oct 7, 2008 #3
    How about opening the cube out so it's flat and looking at it that way.
     
  5. Oct 7, 2008 #4
    Interesting...is that necessary though, or could I just apply kirchoff's laws to it as it is?
     
  6. Oct 7, 2008 #5
    I count from any one node:
    3 paths to 3 nodes which then connect by:
    6 paths to 3 nodes which then connect by:
    3 paths to 1 node.

    connecting the 3 nodes together with wires should change nothing.
     
  7. May 25, 2009 #6
    are you saying just ignore those 6 connections?
     
  8. May 25, 2009 #7
    I think the post I was responding to was deleted.
     
Know someone interested in this topic? Share this thread via Reddit, Google+, Twitter, or Facebook

Have something to add?



Similar Discussions: Total resistance through cubic circuit
Loading...