Excuse me but, this is a rough translaton from a Portuguese homework. Also, excuse me for my lack of knowledge in some physics, I do a programming course and one of the teachers said we had to know about this. 1. The problem statement, all variables and given/known data http://img181.imageshack.us/img181/7084/87202322av0.jpg [Broken] http://g.imageshack.us/g.php?h=181&i=87202322av0.jpg [Broken] Taking into account the circuit above, answer these questions: a) What is the value of i1, i2, i3 b) Calculate the potentials Va, Vb, Vc, Vd, Ve and Vo taking in account the ground (sorry I don't know the correct term, it's the value on the right. 2. Relevant equations Kirchhoff law i1 = i2 + i3 V = RI U = V - RI 3. The attempt at a solution This teacher is known for being nasty with the students and he gave us this homework without any explanation only saying that we'd need to know about the Kirchhoff laws. I only found about you guys today, and this homework is due tomorrow (it's worth the grades for the bimester) So if possible, help! I'm reading a lot of books ATM and will keep updating here 'til the time to deliver the work. Thanks in advance.