Calculating Current in Thevenin Equivalent Circuit?

[john88]

I trying to figure out a thevenin equivalent circuit

I want to calculate the current I so I can't get the resistance for the thevenin equivalent.

Im not 100% sure how to calculate I, can I use KCL on the node under the number -8.7V?

http://img98.imageshack.us/my.php?image=curfc7.jpg

 

[Defennder]

That sure is a complex circuit. To find R_th, kill all the current and voltage sources and then measure the equivalent resistance between A&B.

KCL is valid everywhere. Is that -6.7 and -8.7 node voltages given by the question? If so, then you can easily find I_sc. Also note that the 1mA source is connected in parallel with a short-circuited wire.

 

[john88]

so if short circuit the system. Can I setup KCL on node A and then solve for I,
I = I(source) + I(R10).

But it seems odd to do so.

 

[Defennder]

You got the equation wrong. It's I_R10 = I_source + I. Be careful of the direction designated for Isc.

 

[john88]

ok, got everything together now, ty for the help!