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MCCCLXXXV

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I have a computer fan that I'm trying to repurpose. The specs on the fan say DC12V, 0.25A.

I'm trying to model the fan in a circuit diagram because I want to 1) make sure i don't put too much current through it and 2) add a potentiometer to it to control the speed. Now, in order to find the effective resistance of the fan, I thought I would be able to simply use the V=IR equation and solve for R=12/.25=48ohms. But I hooked up an ohmmeter to it and it seemed like the resistance was no where near 48 ohms and jumped around a lot (mostly just went into overflow mode). What would be the proper way to model the resistance of the fan?

Thanks