If you look at this website: http://www.ibiblio.org/kuphaldt/electricCircuits/DC/DC_10.html
Search for the word "downstream", you'll see a basic DC circuit with 3 unknown currents. There is a node in the middle that I called Vx. Using the equations:
-I1 + I2 -I3 = 0
I1 = (Vx-28)/4
I2 = -Vx/2
I3 = (Vx-7)
We get:
-(Vx-28)/4 -Vx/2 - (Vx-7) = 0
-Vx + 28 - 2Vx -4Vx + 28 = 0
-7Vx = -56
Vx = 8
I1 = (Vx-28)/4 = -5A
I2 = -Vx/2 = -4A
I3 = (Vx-7) = -1A
BUT if you scroll down on this site and look at their solution, they found I1 and I2 to be positive. Who is correct, me or this website? Thanks!
Search for the word "downstream", you'll see a basic DC circuit with 3 unknown currents. There is a node in the middle that I called Vx. Using the equations:
-I1 + I2 -I3 = 0
I1 = (Vx-28)/4
I2 = -Vx/2
I3 = (Vx-7)
We get:
-(Vx-28)/4 -Vx/2 - (Vx-7) = 0
-Vx + 28 - 2Vx -4Vx + 28 = 0
-7Vx = -56
Vx = 8
I1 = (Vx-28)/4 = -5A
I2 = -Vx/2 = -4A
I3 = (Vx-7) = -1A
BUT if you scroll down on this site and look at their solution, they found I1 and I2 to be positive. Who is correct, me or this website? Thanks!