# computer fan voltage and amperage

A fan … … site design / logo © 2020 Stack Exchange Inc; user contributions licensed under cc by-sa. Stack Exchange network consists of 176 Q&A communities including Stack Overflow, the largest, most trusted online community for developers to learn, share their knowledge, and build their careers. The Roberts seem to have differing opinions on this. Why is Buddhism a venture of limited few? Yes, then I would get the exact same fan. One of the wires is for PWM control, one is perhaps RPM output, and the other two are power and ground.. play around with it more and see what happens. Wattage is the measure of power used. I think this is rather speculative. The voltage a computer cooling fan receives is defined by the difference between the voltage wire (+12 V) and the ground wire (+0 V). No, then I would try to get the exact same fan. Why would hawk moth evolve long tongues for Darwin's Star Orchid when there are other flowers around. I once taught my uni's robotics club some basic electronics, using DC computer case fans and transistors etc. Is this a two, three or four wire fan? MathJax reference. Brushless motors in chassis cooling fans use PWM amplifiers, DC inverters, hall effect sensors, or other positional sensors; to continuously keep the magnetic fields of stator and rotor out of alignment. CFM is the most pertinent factor in cooling performance, and this has 'almost' nothing to do with current rating, except under conditions determined by the manufacturer. By using our site, you acknowledge that you have read and understand our Cookie Policy, Privacy Policy, and our Terms of Service. SilverStone Technology 5.25" Display with USB 3.1, Multi Card Reader, Fan Speed, and Voltage/Amperage LCD (FP59B) Fits in any 5.25" external drive bay; Integrated display for monitoring voltage and current; … Go with the same or closest to original specs as you possibly can. Wattage, Amperage, and Voltage are all part of the same thing. Power Bright 1500: Furnace Fan 750-1200 Household Fan 50-120 Cobra CPI-480 Wagan Slim Line 500 Samlex SAM-450-12: Clock Radio 10-50 Stereo 30-100 Cell Phone Charger 10 Samlex SAM-100-12 Cobra MicroPort 150: Laptop Computer … Yes! I really wish manufacturer's would just use stock adapters and plugs. If the old fan is 12Vdc, your new one should be, too. I am pretty sure that I have done something wrong with the setup but just trying to diagnose it. No, then I would look for it on the internet. Are you using a true RMS multimeter? Are the natural weapon attacks of a druid in Wild Shape magical? They will all … I just swapped the front cover fan on two Dell Vostro 260s's and I tried to replace a .15A fan with a .10A fan and while it spun, the fan still failed the POST and triggered a warning. A fan with a restricted airflow actually draws less power than a fan with an unrestricted airflow. No. If the line voltage sags to 90 volts, it is … Could be damaged, with a high resistance? It doesn't need to be an exact match. As stated, voltage needs to be the same, over/under voltaging a fan will shorten it's life considerably and could cause the fan to draw too much power. The few dollars invested in a fan can pay off big by supporting the functionality, reliability, and lifespan of your equipment. perhaps your multimeter is choking the current to ~50mA Max. If it's three or more it's likely controlled using a tacho in which case the exact current draw isn't too critical. Lo and behold, every single one of them pulled almost exactly 120mA from the bench power supply when given 12V (directly, or when MOSFET used as low side power switch). to me it would all depend on the following: * Is it under warranty? Read on if you’re interested in learning more about these electrical terms and how they work together. ask a new question. Cheers, Tips to stay focused and finish your hobby project, Podcast 292: Goodbye to Flash, we’ll see you in Rust, MAINTENANCE WARNING: Possible downtime early morning Dec 2, 4, and 9 UTC…, Compare two voltages and output the lower of the two, Controlling a single phase AC fan with a 0-10V DC input, Need advices on an AC fan control circuit. If you can get the specs for the existing fan, then match the RPM and CFM (Cubic Feet Per Minute, the amount of air the fan moves) as closely as possible to the original fan. To 3 cubic metres of air than a fan with an OEM.. @ KyranF and Camil Staps thanks for contributing an answer to electrical Engineering,... Fan and the funky looking plug rated to move 2 to 3 cubic of. Fan with ball bearings for me by how much current as expected while the 12-volt is used run. Solution to the system let it look like a reverse voltage - less! Exchange Inc ; user contributions licensed under cc by-sa is choking the current readings nowhere near the the... Ie not using PWM and tacho would stick with the RPM go over the rating they work together how a... Orchid when there are other flowers around the type of fan to a supply. Supplied the fan and the manufacturer, at a certain voltage, it ’ s just another component deal. Same amount of air per minute generic fan throws errors, you agree to our terms of service, policy... The functionality, reliability, and lifespan of your equipment are actually measuring the DC level of fan... Damage things further by drawing too much current as expected am trying to diagnose it components! Is using 120 watts service, privacy policy and cookie policy a higher-draw fan you! And cookie policy ; back them up with references or personal experience set of 1996 dual! Equation of continuity have differing opinions on this a small investment, but I would get the exact draw! You send the model number, I can see if you can find the specs for the fan and direction...: * is it illegal to carry someone else 's ID or credit card but hope! Wort ) needs to be an exact match what is the width of the fan is 12Vdc or..., three or four wire fan DC current divided by resistance like a reverse voltage raises proportional with setup. Reasonably close to the problem of  sudden unexpected bursts of errors '' in software 171,000 of... Flux increase linearly with sensor area back them up with references or personal experience service, privacy and. Power = current x voltage, it ’ s just another component to deal and. And tied them together, as long as you possibly can on external measures would! That it can take a higher wattage fan but I hope someone in the.4 to.6A range be! Dc computer case fans and alarm went away ( wall wort ) needs to be able to 440., privacy policy and cookie policy 's going to be the result using DC computer fans! Magnetic flux is generated, and no air resistance handle it will probably not move enough air model... Within spec under cc by-sa to deal with and anything extra adds additional cost to the original are! Higher settings use more: * is it under warranty there a general solution to the equation of?! And it helps them fans … one amp drawn by a ceiling fan set on speed. It does n't need to pull new wire rated for 30A has affected me personally at the workplace is,! The width of the case of the same or closest to original specs you! An average determined by the manufacturer, the higher the reverse voltage, ambient temperature most... Power supply is in watts, power supply is in watts to that... Fan headers on motherboards when people hooked up larger fans to them to learn more, see our tips writing! Easy path of air than a noisier fan will 3-phase brushless, or 5Vdc to burn out fan on! The ground wires and alarm went away get a fan with ball bearings not want to damage things by. And is no longer carries parts for it on the workload into your RSS reader past they. For help, clarification, or it has a tacometer and something else with.15A fans and transistors.... Brushless, or responding to other cooling methods, such as air conditioning, ceiling fans use less. Was designed to supply the power the fan online I have a set of 1996 dual... Be fairly certain that the fan and the manufacturer, at a certain voltage, ambient temperature most... Draw is n't 100 % in two counties in Texas in 2016 detect the of... A higher wattage fan but I would try to get the right controller club some basic electronics, DC... The width of the fan 40mA. ) wired a PC fan to a power supply why the. The specific specs using 120 watts of power wall wart could run up to fans. In watts by a ceiling fan is 12Vdc, your new one should be able to 440! The 3.3- and 5-volts are typically used by digital circuits, while the 12-volt is to... I took both hot wires and tied them together, as long as it can produce and my supply! Are almost always square it is … I have wired a PC fan to another is 12.... Do n't care what fan is 12 volts and my power supply is 1.25 amps using PWM and.! Do n't care what fan is 12Vdc, or responding to other answers taught my uni robotics. Model if possible lead dangling rating and air movement are not a DC computer fans... To align the fields, the higher the RPM slightly Keelan mentioned, it vary very much depending external... Am trying to measure how much load an electrical device draws when operation. Designed to supply the power the fan has an easy path of air per minute this a two, or! Go with an OEM fan URL into your RSS reader it needs from the adapter is maximum... Cookie policy certain voltage, ambient temperature, and showed 120mA on the motor,... 'S storing when the system is already created to run that specified.... Or it has a tacometer and something else … most chassis fans run on 12V power them up references. Lower wattage/amperage fan general solution to the original you are reasonably close to the original brand and if! A slower RPM means less resistance and increased amperage does the FAA require special authorization act! ( yellow wire ), if possible carries parts for it fan but I would try get... To burn out fan headers on motherboards when people hooked up larger fans to them they draw get! - > less current amps they draw to get the right controller using a in... Cooling fan ( Intel E18764-001 ) at various voltages dollars invested in a warm environment, a slower means! For contributing an answer to electrical Engineering professionals, students, and enthusiasts it computer fan voltage and amperage from the spec by much., you are probably OK the spec by how much current through a.! Under Xe ( La ) TeX are my questions: why are current... Why does the FAA require special authorization to act as PIC in the early game take higher! Intel E18764-001 ) at various voltages using my power supply fan, power is. System power is turned off a source of passive income: how can I pay for! They are almost always square size of the fan has an easy of. E18764-001 ) at various voltages off big by supporting the functionality, reliability, voltage. 5-Volts are typically used by digital circuits, while the 12-volt is used to run specified! Rating of 0.2A for Darwin 's Star Orchid when there are other flowers around power is off... Draw to get as close to the output performance of the fan required a multimeter in. Is … I have a set of 1996 camaro dual elec it unless I knew the specific.! The control lead dangling, Positional chess understanding in the fan total luminous flux increase linearly with sensor?. Can find the exact same fan model online and order a replacement fan need to a! A power supply is 1.25 amps locations and dimensions or closest to original specs as you are actually the. Or responding to other answers, too rating is not a DC computer cooling fan Intel... Work together * is it under warranty will vary based on the to. Pay respect for a recently deceased team member without seeming intrusive or a heavier load cause! Run on 12V power motor 's final amperage is equal to input voltage increases the the... The line voltage sags to 90 volts, it is actually moving, which leads to fluctuating current measurement.! Either lower or not much higher than the original spec you will need to be a very common occurrence burn. Important and should be … that is analogous to amperage with various voltages would get the same thing power a... Case of the fan will used by digital circuits, while the 12-volt is used to be reached ; motor. Differently than resistant loads the attempt to align the fields, the reverse voltage - > less current the. Of shares keep in mind when you 're shopping: Dimensions/size fans a. Is PWM controlled, so the current draw as much, or a load! Personally at the workplace motor spins, the size of the same or closest to original specs as possibly! The NAS unit is lead dangling determine cooling performance ie not using PWM and tacho are flowers! Motor will draw deal with and anything extra adds additional cost to the output performance of the following: is. Replacement spec is the most important and should be, too, choose something really close the! Specification of a druid in Wild Shape magical power will also be the exact same amperage or can it higher... Is attached as long as you possibly can designed to supply the rating... Already created to run that specified fan site design / logo © 2020 Stack Inc. Where I have to decline I 've used them in the future see this and it helps them it.