/diy/ - Do It Yourself

Anonymous Mon Sep 16 08:31:18 2019 No.1683647 [View]
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Can someone doublecheck my noobmath?
I have a fan that draws .1A at 12V
I have 24V power source and i want to run the fan at 4V which draws 0.035A

So
20V = 0.035 * R
R = 571Ω

So at 24V source i need 571Ω resistor to run the fan at 4V 0.035A

24V * 0.035A = 0.7W the resistor has to dissipate
those small blue shits can do 0.5W at most, so if i put 2x240Ω resistors in series i should be golden
Does my math check out?

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/diy/ - Do It Yourself

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