1. May 24, 2016

1. The problem statement, all variables and given/known data

Please give me a clue, I don't understand, how to find the magnitude of $I_{ab}$?

2. Relevant equations

3. The attempt at a solution

2. May 24, 2016

### cnh1995

What have you tried so far? Are you familiar with KCL?

3. May 24, 2016

### CWatters

Have you worked out the voltage on a/b?

4. May 24, 2016

I am stuck. What is KCL? Is it Kirchoff's Current Law?

How?

5. May 24, 2016

### CWatters

Yes.

"a" and "b" are at the same voltage because they are connected together. To work out that voltage you can simplify the circuit and use the potential divider method. There are other ways.

Once you have that voltage you can calculate the currents through all the resistors. Then apply KCL at either a or b.

or you can just wade in and apply KCL from the outset.