Solving for Potential Difference in a Circuit Using Kirchoff's Rule

[fubag]

[SOLVED] Kirchoff's Rule on Circuits

Homework Statement

http://img296.imageshack.us/img296/7852/question1zu0.th.jpg

What is the potential difference V_{ab} of point a relative to point b?

I found out earlier that the current in the top branch is 0.8 A

In the middle is 0.2 A

and at the bottom is 0.6A

Homework Equations

So V = IR - IR

The Attempt at a Solution

3*(0.8) - 4*(0.2) = 1.6V



But this isn't working for me...what am I doing wrong?

 

[mysqlpress]

the direction of 0.2 A current is in opposite direction...

 

[fubag]

oh thanks a lot!