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what size resistor?

Discussion in 'Cases, Modding & Electronics' started by tigger, Mar 20, 2006.

  1. tigger

    tigger I'm the only one

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    just a quickie,what size resistor do i need in line to drop the fan voltage to 7v?,without doing the yellow+/red- thing?.i dont really want or have room for a controller.
    thanks guys
  2. Yin

    Yin

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    well it might be a 5v resistor.......
    12v - 5v = 7v
    im not a totally sure thats what their measured in but if you ask whereever your buying it from they should help
  3. mikechinym

    mikechinym New Member

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    if i am not mistaken,
    volt=ohm x ampere...
    to reduce the voltage,it must know both the resistor and your fan voltage resistance...
  4. Yin

    Yin

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    ahh yeh thats right
    v/ir
    v = voltage (volts)
    i = current (amps)
    r = resistance (ohms)
    Im pretty sure if you look on your psu
    it will tell you the amps on your 12volt rail. normally its about 20amps i think, but it varies from psu to psu.
    im a physic student but im pretty sure thats right
  5. ferynov New Member

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    volt

    Volt = i (ampere) / R (resistor)
    then

    7 = 5 Ampere (approx) / R

    7 / 5 = R R=1.4 Ohm ... check the ring colour ..or ask mr.google

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