LOAD RESISTOR in ATX PSU ! - Everything you need to know(explained)(LAB Bench PSU DIY)

Find out what is a load resistor, its purpose, material, values, do you even need to use one, where to connect it and mount it, how to calculate what its values should be, all that and more, coming up.
Even if you are not going to use load resistor in ATX PSU, you can still use this video to learn what a load resistor is exactly.
To clarify the 12V resistor you see at 10:44 , there is no resistor that has voltage rating.
Resistor only has resistance in ohms and how much power it can handle.
No resistor is limited to 12V, so disregard that, manufacturer made a mistake printing that on, probably to make it sell faster.
Even though it says "12V" on it, you can use it on any voltage line as long as you don't exceed its power rating.And you can calculate that using ohms law calculator used in video.
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[@tonkopapic7414]

Hi, great video, I'm a newbie and now I can better understand the resistors in the power supply, thanks, at 22:43 maybe you mean "Watts" instead of "Ohm"

[@siphozikalala7834]

Thank you so much for this informative video.

[@breannestahlman5953]

Very good, Thank You.
Great, great and very great ! ! !
😁

[@tecbabu2921]

Nice sir....
Tq very much

[@RadarRon]

Extremely informative video! So many content producers don’t go through the hows and whys of the subject. As far as repeating yourself, you shouldn’t worry about it. Think about it as reiterating or highlighting the more important points.
I do have a question that may be related to this subject. I see on some Volt/Amp (panel) meters they have a “Shunt resistor” included, others don’t have them. Is that basically another term for a load resistor? Is a shunt only required when is it higher amperage? The panel meters that don’t come with a shunt included do they still need a shunt to work properly?
Thank you in advance.

[@enzomedina2077]

I'm building a bench PSU, the 5v is stable with no resistor but the 12v and 3.3v are not, do I still need to put a load on both of those rails or with the 5v being stable is enough? The 5v rail is the highest amperage with 30A

[@antoniogalante6806]

I am building a power supply, but not with a ATX PS. I bought 24V 6A power supply, and a step down converter 150W and 12A, so it can handle 6,25 A. I have to use a load resistor too? I want to use that supply for a soldering iron station, so i dont know the exact power i will need and how much current i want

[@muppetpaster]

4:00 Not only DC needs to be as "stable" as possible....Same goes for AC. Preferably AS STABLE AS POSSIBLE.

[@FHDesert]

My power supply won't start up (I did a jumper from green to black (ground)). No fan, nothing. I accidentally bought a 50W 20ohm resistor, knowing nothing about them. My power supply is rated for 305 watts maximum. The bundle of wires rated for the highest amps is the 5v (22 amps), so that's the one I connected the resistor to (one side red, the other black).
When I power it up, nothing happens. So I tried jumping the green to the second bundle of black wires (ground). I also jumped the brown wire (which is 3vSense) and jumped it to the 3.3 v bundle of wires (orange). None of these things worked, and I get no fan, and when I take the meter to the various lines, it just reads zero. It seems dead.
Can anyone offer guidance? Did I kill it with the 50W 20ohm resistor? It came out of my computer that worked up until the day I took it out for this project. Thank you.

[@Priest]

If PSU does not start at all when you do a jumper wire from green to black without load resistor, it might mean PSU itself is not working.
It would be good to test it in actual computer configuration
No you did not kill your PSU with a load resistor, as 20 ohms on 5v power line would draw 0.25A and generate 1.25w of power.
PSU was probably dead already before you connected the load resistor.
Still to be sure, connect it to some configuration(motherboard+gpu+hdd at very least although I would add a DVD drive) and see if it turns on, if it does that means you need more load, like 5 ohms resistor on 5v line or 2.5 ohms.
And maybe you need more load on other voltage lines, like I said in the video, some PSUs need loads on multiple voltage lines.

[@muppetpaster]

23:00 EVERY(!!!) resistor has to handle "a certain" amount of power....

[@billthekid1982]

Nice Win XP in 2023 🤣😂

[@clobel55]

although your presentation is good, you unfortunately drown your listener into a sea of useless details.

[@ddistrbd1]

God bless you for saying exactly what I was thinking, his analogy is good but the useless unrelated explanation could have the opposite effect and can confuse people, but in all honesty I still appreciate the the time this man spent to make the video and make us understand the concept .