Mesh current equations yielding 2 different values for i2 current.

Thread Starter

PieterT2000

Joined Dec 16, 2020
2
Image-1.jpg
My mesh current equations:

- 300*i1 + 500(i1 - i2) + 600*i1 = 0
- 200*i2 -25 + 13 + 500(i2 - i1) = 0

Since i1 is 25mA i2 can be found easily. However, equation 1 will yield 70mA while equation 2 will give 35mA for i2.
What am I missing here?
I would be very grateful if someone can point out my mistakes.
 

Thread Starter

PieterT2000

Joined Dec 16, 2020
2
My problem is already resolved. I just realized that, when I use the first mesh current equation to find i2, I'm ignoring the voltage drop across the 25 mA source!
 

ericgibbs

Joined Jan 29, 2010
11,563
hi T2,
As you say the 25mA source when flowing around the 1042 Ω loop will create a voltage across the source of ~26v
E


E
 
Last edited:
Top