Cooler running resistor

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  • Sylvester
    Senior Member
    • Nov 2006
    • 67
    • UK

    #1

    Cooler running resistor

    Not sure of the power draw on a circuit, the resisor specified is a 56 ohm 5 watt, what can I use that is cooler running? The resistor is used as a load on a 12v circuit.
  • rievax_60
    Badcaps Veteran
    • May 2012
    • 897
    • australia

    #2
    Re: Cooler running resistor

    A physically larger resistor like a 10 watt resistor will have less temperature rise because of its lager surface area. Or you could attach the 5 watt resistor to a finned heatsink.
    Or use a high resistance if it doesn't cause other problems.
    Last edited by rievax_60; 07-15-2017, 09:09 PM. Reason: extra

    Comment

    • R_J
      Badcaps Legend
      • Jun 2012
      • 9515
      • Canada

      #3
      Re: Cooler running resistor

      56 ohms accross 12 volts is about 214 ma of current, so the wattage would be about 2.6 watts.

      Comment

      • Sylvester
        Senior Member
        • Nov 2006
        • 67
        • UK

        #4
        Re: Cooler running resistor

        Thanks, probably go for a 10w resistor, did think of an aluminium ohmite resistor, think they do a 15w one.

        Comment

        • petehall347
          Badcaps Legend
          • Jan 2015
          • 4423
          • United Kingdom

          #5
          Re: Cooler running resistor

          any wattage resistor will get as hot . use a heat sink to dissipate the heat or install a fan

          Comment

          • Sylvester
            Senior Member
            • Nov 2006
            • 67
            • UK

            #6
            Re: Cooler running resistor

            Fan not practical, I'll use a heatsink.
            Last edited by Sylvester; 07-20-2017, 11:15 AM.

            Comment

            • PeteS in CA
              Badcaps Legend
              • Aug 2005
              • 3578
              • USA, Unsure of Planet

              #7
              Re: Cooler running resistor

              Originally posted by Sylvester
              Thanks, probably go for a 10w resistor, did think of an aluminium ohmite resistor, think they do a 15w one.
              Keep in mind that those finned panel mount resistors are designed to have some sort of heat (like a ........ panel). Without that a 15W resistor might be 5-7 watts or something like that.
              PeteS in CA

              Power Supplies should be boring: No loud noises, no bright flashes, and no bad smells.
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              To kill personal responsibility, initiative or success, punish it by taxing it. To encourage irresponsibility, improvidence, dependence and failure, reward it by subsidizing it.
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              Comment

              • R_J
                Badcaps Legend
                • Jun 2012
                • 9515
                • Canada

                #8
                Re: Cooler running resistor

                What are you doing? Is this 56 ohm resistor just there to put some load on the 12 volt power supply?

                Comment

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