1. The problem statement, all variables and given/known data Given I0=-2 A I1=-4 A Is= 8 A Vs= 12 V Find all the unknown currents. http://sphotos-a.xx.fbcdn.net/hphotos-snc7/398253_493549703997883_2004542070_n.jpg [Broken] 2. Relevant equations Kirchhoff’s current law 3. The attempt at a solution I start at node a and found I2= 6 A and then from R2 follow the current to find out that Is= I3 + I2 = 8A => I3= 2 A thanks for your time.