Hi,
I have this circuit (attached) and the question is: find the Thevenin voltage. If I find the voltage over the 1K Ohms (near the interface line) will that be the Thevenin Voltage?
Thanks

 

It will be if you remove the load first.

 

So if I ignore RL the voltage over the 1K will be RTH?

 

So if I ignore RL the voltage over the 1K will be RTH?

You can answer that question by considering what the Thevenin voltage represents. Look at the equivalent circuit. What will the voltage at the load terminals be if the load is removed? It will be the Thevenin voltage. Since this is an equivalent circuit (in terms of voltage and current at the load terminals), then the Thevenin voltage is also the voltage appearing at the load terminals in the actual circuit when the load is removed.