Engineering What happens to voltage when the circuit is opened

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When a circuit is opened, the voltage across the terminals increases to the maximum value that the circuit can provide, as there is no current flow. To find the Thevenin equivalent circuit with respect to terminals a and b, one must determine the open-circuit voltage and the equivalent resistance seen from those terminals. Nodal voltage analysis is a common method for this, but it may require careful application to avoid confusion. If stuck, revisiting circuit simplifications or using mesh analysis could provide clarity. Understanding these principles is crucial for solving Thevenin equivalent problems effectively.
smart boy
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Hello, everyone.

Homework Statement



I have a problem in the homework which is about finding the Thevenin equivalent for this circuit:

[PLAIN]http://up.qloob.com/upfiles/8gm66408.bmp
How can I find the Thevenin equivalent circuit with respect to the terminals a, b ?

Homework Equations




The Attempt at a Solution


I tried to use nodal voltage analysis but I stuck.
 
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