I need to find out how many amps a 12v 120mm pc fan uses on average.

Not much that you need worry about, it is going to be in the mA range. However if you really need to know you can work it out by measuring the resistance of the fan when disconnected then apply Ohm's law.

I = V/R

I = currant

V = voltage

R = Resistancehttp://www.the12volt.com/ohm/ohmsla...

Stuart

Or look at the label on the fan, they usually have the voltage and current rating.

Somewhere around 0.25A.

The link below is for a 120mm 12V case fan. The rating on that one is 1.25 watts. Divide the watts by 12v to get the amps. Pretty small number.

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