Physics Current Problem (I1,I2,I3)

[buddy72192]

Homework Statement

1. Determine the currents I1, I2, and I3 in the figure. Assume the internal resistance of each battery is 1.3 ohms.

2.What is the terminal voltage of the 6v battery?

Picture http://i945.photobucket.com/albums/ad291/buddy72192/GIANCOLIch19p32.jpg

Homework Equations

Ok, so from what I can tell I1=I2+I3 for this equation.

The Attempt at a Solution

I went around counterclockwise for both loops and came up with:

Loop #1
11.3I2 + 21.3I1 = 24
Loop #2
34.3I3 - 11.3I2 = -6

To get common I's I subbed (I1 - I2) in for I3

So Loop #2 becomes...
34.3I1 - 34.3I2 -11.3I2 = -6

When I solved for that I got (Incorrect)
I1=.755A
I2=.7A
I3=.055A


Please Help! I've been trying for over 2 hours

 

[gneill]

Homework Statement

1. Determine the currents I1, I2, and I3 in the figure. Assume the internal resistance of each battery is 1.3 ohms.

2.What is the terminal voltage of the 6v battery?

Picture http://i945.photobucket.com/albums/ad291/buddy72192/GIANCOLIch19p32.jpg

Homework Equations

Ok, so from what I can tell I1=I2+I3 for this equation.

The Attempt at a Solution

I went around counterclockwise for both loops and came up with:

Loop #1
11.3I2 + 21.3I1 = 24
Loop #2
34.3I3 - 11.3I2 = -6

To get common I's I subbed (I1 - I2) in for I3

So Loop #2 becomes...
34.3I1 - 34.3I2 -11.3I2 = -6

When I solved for that I got (Incorrect)
I1=.755A
I2=.7A
I3=.055A


Please Help! I've been trying for over 2 hours

Hi buddy72192, Welcome to Physics Forums.

As far as I can see your stated results look fine. Perhaps you have a significant figures or required units issue when entering the results?

 

[NascentOxygen]

I get similar results. http://www.wolframalpha.com/input/?i=24=21.3x+11.3y,-6=-11.3y+34.3z,x-y=z