the middle of the circle.

It's going to be +2 (I1-I3),

which is the one in opposite direction of I1.

We then go down, and then we encounter the 7A source,

and the voltage are up across the 7A source.

We don't know what that voltage drop is, so we'll have to add a term,

maybe call it V7 amp for that voltage source and that's equal to 0.

That's our first voltage blue for

our first mesh that we've have had the voltages around, and

gets us form the beginning around each element and back to their starting point.

If you look at that equation, we'll see that we have a leak current, I 1,

I 2 and I 3 which are unknowns, but we've introduced another unknown.

And then as the voltage drop across a 7 amp source.