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

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The discussion revolves around calculating the potential difference V_{ab} in a circuit using Kirchhoff's Rule. The user has determined the currents in various branches of the circuit, noting 0.8 A in the top, 0.2 A in the middle, and 0.6 A at the bottom. They attempted to apply the formula V = IR but encountered issues with their calculation, specifically regarding the direction of the 0.2 A current. Clarification on the current's direction was provided, indicating that the user needed to adjust their approach. The conversation highlights the importance of correctly applying Kirchhoff's laws to solve for potential differences in circuit analysis.
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[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?
 
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the direction of 0.2 A current is in opposite direction...
 
oh thanks a lot!
 

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