How to Calculate Equivalent Resistance in Series and Parallel Circuits?

hello

please help me with this problem.

Find the equivalent resistance. (with complete explanation)

thanks

Hi,

The key here is to make the complex circuit as simple as possible. http://www.allaboutcircuits.com/textbook/direct-current/chpt-7/re-drawing-complex-schematics/ It would be best if you try it yourself.

Hi Saeed,

For this type of circuit you can't simplify using only equivalent resistors. You need to use Kirchoff's Circuit Laws (Voltage & Current) to solve this circuit.

1) Label each branch with a current name (I1, I2, I3, etc)
2) Use Kirchoff's Current Law to find an equation for each Node
3) Use Kirchoff's Voltage Law to find an equation for each Loop
4) Use the math you learned in class to solve the system of équations (isolate variables and substitute).

Here's a great link on applying Kirchoff's circuit laws:
http://www.electronics-tutorials.ws/dccircuits/dcp_4.html

But Kevin is right, you need to solve this yourself!

Just by inspection, this can be solved using Y-delta transforms, it breaks down rapidly applying that technique, without any complex maths, the short, symmetry, and the two series resistors are the key to using the method,
cheers,
Richard