Equivalent resistance of simple circuit

  • Thread starter nil1996
  • Start date
  • #1
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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?
 
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Answers and Replies

  • #2
31
0
Think about drawing this in a different way so you can see the parallel and series resistors more clearly
 
  • #3
130
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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
301
7
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
 
  • #5
UltrafastPED
Science Advisor
Gold Member
1,912
216
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!
 

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