# Equivalent resistance of simple circuit

1. Sep 18, 2013

### nil1996

1. The problem statement, all variables and given/known data
Find the equivalent resistance of the following circuit.
http://img706.imageshack.us/img706/9644/zkz7.png [Broken]

2. Relevant equations
none

3. The attempt at a solution
I am not able to find out which are resistors are in series and are in parallel.Is there any special method to solve these problems?

Last edited by a moderator: May 6, 2017
2. Sep 18, 2013

### Gank

Think about drawing this in a different way so you can see the parallel and series resistors more clearly

3. Sep 18, 2013

### consciousness

Use the symmetry of the circuit. There is a plane about which the circuit is symmetrical. By symmetry all the points in this plane are equipotential. Armed with this information you can simplify this circuit by removing a resistor as no current flows through it.

4. Sep 18, 2013

### nil1996

thanks a lot!!:thumbs:
i solved the problem

5. Sep 18, 2013

### UltrafastPED

This network is an example of non-parallel/non-serial. The direct method is to use the Y-Delta transforms: http://en.wikipedia.org/wiki/Y-Δ_transform

Then you can slowly reduce the network to a single resistance. The symmetry argument is very clever ... but the transforms work even when you are not feeling clever!