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

Name: Sean OBrien
Date: July 3, 2009 at 06:50:46 Pacific
OS: Windows Vista
CPU/Ram: Phenon 2.2ghz 4gb
Product: N/a / CUSTOM BUILT
Subcategory: General

Comment:

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

Name: StuartS
Date: July 3, 2009 at 07:31:38 Pacific

Reply:

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

0

Name: Kurt S
Date: July 3, 2009 at 08:11:50 Pacific

Reply:

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

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Name: jam
Date: July 3, 2009 at 10:25:18 Pacific

Reply:

Somewhere around 0.25A.

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Name: OtheHill
Date: July 3, 2009 at 13:58:19 Pacific

Reply:

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

1

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