# Homework Help: Finding current from a circuit

1. Feb 9, 2010

### -EquinoX-

1. The problem statement, all variables and given/known data

http://img638.imageshack.us/img638/2416/64523221.jpg [Broken]

2. Relevant equations

3. The attempt at a solution

My approach at this problem is using the voltage division law:

I first need to find the voltage at the 12 ohm, this can be done by the following using voltage division law.

Vb = (0.04 * 13)/ 41
Va = (0.04 * 28)/ 41

then we subtract the two, is this true?

Last edited by a moderator: May 4, 2017
2. Feb 9, 2010

### rl.bhat

Let i branch out. i1 flows in upper loop and i2 flows in the lover loop.
Apply Kirchhoff law.
For upper loop
-12i -17i1 = 0...(1)
For lower loop
-12i - 24 i2 = 0...(2)
Similarly write down the equation for the left side loop which contains the voltage source and solve the equations to find i.

3. Feb 10, 2010

### -EquinoX-

is the left side equal to:

40mV - 28i = 0

4. Feb 10, 2010

### rl.bhat

No. i1 and i2 are in the opposite direction.
So it should be
40 mV = 16*i1 - 12*i2