- #1

curiosissimo

- 10

- 5

- Homework Statement
- We have a circuit (photo below) with 2 voltage generators and 2 resistors. In the node A the current intensity ##i=20A##. We know that ##ΔV1 = 100V##, ##ΔV2 = 200V##, ##R1 = 10Ω##, ##R2 = 30Ω##. We have to get the verse and the value of the currents ##i1## in the branch LM and ##i2## in the branch. ON. The exercise tells us to set the direction of travel clockwise.

- Relevant Equations
- Kirchhoff laws

The main problem is the verse of the 2 currents ## i1 ## and ## i2 ## . I think they both go clockwise, so in the node A we should have ##i1+i2=20A##. Now let's apply the second law (going clockwise). So ##ΔV1-R1*i3 - R2*i4 + ΔV2=0##, where ##i3## and ##i4## are the currents which pass through ##R1## and ##R2##. But why aren't ##i3## and ##i4## equal to ##20A##? According to the solution, ##i1## is positive, while ##i2## is negative. So is ##i2## going counterclockwise? It doesn't make sense, it can't.