# Homework Help: Resistance in an octahedron between two points.

1. Apr 10, 2012

### zeralda21

1. The problem statement, all variables and given/known data

Twelve identical wires, each with resistance 1.0 ohms, are linked together to form a
octahedron (see figure). What is the resistance between corners E and F?

http://etc.usf.edu/clipart/65700/65732/65732_octahedron_md.gif
2. Relevant equations

I assume:

Ohms Law: U=R*I

Parallel connection of resistors: 1/R_total=1/R_1+1/R_2...+1/R_n

3. The attempt at a solution

First of all I wanted to create a 2-dimensional wiring diagram to simplify the problem. From there I concluded that this was a parallel connection of resistors. One question I asked myself is if the current is equally large between all wires, so I am trying to find out in the book. Maybe that could be of any help.
1. The problem statement, all variables and given/known data

2. Relevant equations

3. The attempt at a solution

2. Apr 10, 2012

### Staff: Mentor

This is the sort of problem where symmetry will help, and in fact makes the problem rather simple. Suppose you put a 1V source across E-F. What potentials do you expect to find at the points A,B,C, and D?