Finding Resistance

Aditya3003

1. The problem statement, all variables and given/known data
I need to find to resistance and am having problem as I do not know KCL's. All I know is the total resistance in series or parallel. I have attached the image. Find resistance b/w the 2 ends.


2. Relevant equations
If you have Resnik & Halliday open page 723(Vol2). and see figure 31-41. My question is same with r = 20ohm & R=10ohm.



3. The attempt at a solution

Attached Thumbnails

 

gneill

If you don't know the basic circuit laws it's going to be difficult to proceed; All you can do is try to apply "canned" formulas. Hint: Look up "Y-Delta transformation".

mfb

One resistor has zero current inside due to symmetry, you can remove it and use your formulas for resistors in series/parallel afterwards.