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integral25

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## Homework Statement

http://img339.imageshack.us/my.php?image=45979944dp2.jpg

## Homework Equations

Why did the 10 ohm resistor turn into a 5 ohm resistor when we make it an open circuit.

This is not a homework question, it was an example problem given to us to help prepare for our midterm.

## The Attempt at a Solution

Normally, when I try and find my Th and Norton equivalents, there is a voltage. Deactivating the sources doesn't change any of the values (in the problems I've done).

When Solving something like I would find Req and then apply current division. Afterwards I can apply ohm's law to find Vth.

However, it doesn't work out to the answer i am supposed to get because of how the resistor changed.

Can someone explain to me why this is happening? Or is it simply a typo?

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