Solve Kirchoff's Laws Homework with Expert Help

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Homework Statement

http://img87.imageshack.us/img87/5418/kirchoff2nr2.jpg

Now, I dnt have a clue on homework to solve this.

 

[hage567]

Why? What is confusing you?

 

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there are three loops and 2 nodes.

See when considering one loop, do I have to add all the resistance together.
So for loop 1 (1v)

the resistance is 2.5

so current = 1/2.5=0.4 A

but I am getting the wrong answer

 

[hage567]

How did you get 2.5? You must sum the entire loop. The sum of the changes in potential across all the elements in a closed loop must be zero. You only need to consider two loops here, and the one node (which gives you the relation between the three branch currents). The value for I won't be the same in each part of the circuit.