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Homework Statement
http://img825.imageshack.us/img825/2306/theveninequiv.png
I'm trying to find the Thevenin equivalent resistance for this circuit, but it's proving difficult.
I'v tried to Zero all sources, (assuming that Zero'd current sources are open circuits), and i drew the resulting circuit.
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Homework Equations
I Guess my biggest problem is that R3 resistor that's just floating there, and has one end hooked up to nothing.
The Attempt at a Solution
I know that R4 and R1 are in series. And that R4+R1 are || with R2. But i don't know how this R3 fits into all of this.
Thank you.
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