Thevenin Equivalent: Solving Circuit Problems

[princejan7]

Homework Statement

http://postimg.org/image/5wtty6dvr/

I'm trying to find the Thevenin equivalent of the circuit on the left side and but having trouble in getting the open circuit voltage.

Does no current flow through R3 since that way leads to a dead end?

 

[maajdl]

How could any current flow through R3?
There is no way to go for any current.
Therefore the open-circuit voltage is easy to calculate.

 

[ehild]

Homework Statement

http://postimg.org/image/5wtty6dvr/

I'm trying to find the Thevenin equivalent of the circuit on the left side and but having trouble in getting the open circuit voltage.

Does no current flow through R3 since that way leads to a dead end?

Yes, no current flows through R3 when the circuit is "open". If no current flows, what is the potential difference between the terminals of that resistor?

ehild