# Thevenin equivalent circuit

Discussion in 'Homework Help' started by harley101, Aug 24, 2014.

1. ### harley101 Thread Starter New Member

Aug 24, 2014
2
0
http://imgur.com/YEB7JBD

I am having trouble solving this problem, when I disconnect the load the circuit I obtain the two loops just connected together at one point. I have no idea how to solve this with nodal or mesh analysis. Any help would be appreciated.

2. ### Jony130 AAC Fanatic!

Feb 17, 2009
3,990
1,115
Are you sure that you need to solve any equation?
Don't forget that the current will only flow in closed loop.
I only see two loop. First is Is1 and R1 and the scened loop is from Is2--->Vs--->R2--->Is2. So our loops current are Is1 and Is2, and notice that we already know this currents.

3. ### harley101 Thread Starter New Member

Aug 24, 2014
2
0
No I don't know if we have to solve any equations. I was thinking we don't and they just give us all the parameters to trick us when we only need Vs and the resistances and that the voltage at a would just be 12v. So when we disconnect RL these are independents loops? They don't interact with each other right?

4. ### vinnnie New Member

Jan 21, 2013
13
2
yes, you're right

5. ### Jony130 AAC Fanatic!

Feb 17, 2009
3,990
1,115
Yes, after you disconnect RL resistor we left with two independents loops.
And the correct answer for Vab voltage is 28V.