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Physics 18 Online
OpenStudy (anonymous):

Does any one know where to get free online practice to do ohm's law mathematical problems?

OpenStudy (turingtest):

This isn't just practice problems, but it's very useful: http://ocw.mit.edu/courses/physics/8-02sc-physics-ii-electricity-and-magnetism-fall-2010/current-current-density-resistance-and-ohms-law/

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