(adsbygoogle = window.adsbygoogle || []).push({}); 1. The problem statement, all variables and given/known data

I know how to deal with resistors/capacitors etc in series and parallell circuits, but when it comes to more complex circuits I have no idea how to treat them, and I cant find any guides or info on it and my physics book doesnt tell anything. All solutions to this kind of problems never explain how to think.

Heres a picture on a "normal" parallell circuit that is easy to understand:

http://sv.wikipedia.org/wiki/Parallellkoppling

What I dont understand, is how to treat more advanced circuits when its not trivial if its parallell or a serie. I give some examples of these kind of problems that I dont understand:

1. (see picture namnlös4)

You have 12 1-ohm resistors set up in a cube. What resistance will you get if you measure at the ends over the cubes diagonal?

2. I just cant see how they get the total resistance in this figure (pic circ.jpg)

2. Relevant equations

Serie circuits:

Rtot=R1+R2+...+Rn

parallell circuits:

1/Rtot=1/R1+1/R2+...+1/Rn

3. Given solutions to the problems

1. (see picture sol1)

well I just cant see how they get to that calculation...

2.also see picture circ.jpg

the problem that I dont understand in this one is how the deal with the resistors R3 and R5.

I hope it didnt get too messy. Basically my problem is tips or "formulas" on how to deal with more complex electric circuits.

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# Homework Help: Problem understanding circuit diagrams

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