Equivalent resistance of simple circuit

[nil1996]

Homework Statement

Find the equivalent resistance of the following circuit.
http://img706.imageshack.us/img706/9644/zkz7.png [Broken]

Homework Equations

none

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?

 

[Gank]

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

 

[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.

 

[nil1996]

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.

thanks a lot!:thumbs:
i solved the problem

 

[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!