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Reducing Fan Speeds

Fan Voltage Calculator


Reduce  volts,  amps, to  volts.  

Original fan voltage: 12V

Original fan current: 0.01675A

    V=IR (Ohm's Law), so 12 = 0.01675R   =>   R = 12 / 0.01675   =   716.418

Fan resistance: 716.418 Ohms

Target voltage: 6V

    V=IR (Ohm's Law), so 6 = 716.418I   =>   I = 6 / 716.418   =  0.008

Target current: 0.008A

Voltage drop across resistor: 12V - 6V  =  6V

    V=IR (Ohm's Law), so 6 = 0.008R    =>    R = 6 / 0.008    =  716.418

Target resistance:  716.418 Ohms

Power dissipated by resistor:  6V * 0.008A  =  0.05W

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