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Hi there,

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Ohm's law (http://en.wikipedia.org/wiki/Ohm's_law) says that:

V = IR

We have V = 9 volts, and I = 3 amps:

9 = 3R

Divide by 3:

R = 3 ohms

Let me know if you have any questions.

If not, thanks for pressing "Accept".

-Scott