Solved How many amps does a 12v 120mm pc fan use

N/a / CUSTOM BUILT
July 3, 2009 at 06:50:46
Specs: Windows Vista, Phenon 2.2ghz 4gb
I need to find out how many amps a 12v 120mm pc fan uses on average.

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#1
July 3, 2009 at 07:31:38
✔ Best Answer
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 = Resistance

http://www.the12volt.com/ohm/ohmsla...

Stuart


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#2
July 3, 2009 at 08:11:50
Or look at the label on the fan, they usually have the voltage and current rating.

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#3
July 3, 2009 at 10:25:18
Somewhere around 0.25A.

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Related Solutions

#4
July 3, 2009 at 13:58:19
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.

http://www.directron.com/4412fgl.html


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