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http://img5.imageshack.us/img5/6889/imagepf.jpg [Broken]

I need to create a formula using R (resistance), U1 and U2 (voltage) for the current flowing through the 8 Ohm resistor. I've been looking at this for hours now and I still dont even know where to begin. Can anyone get me started on this?

I need to create a formula using R (resistance), U1 and U2 (voltage) for the current flowing through the 8 Ohm resistor. I've been looking at this for hours now and I still dont even know where to begin. Can anyone get me started on this?

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