Electric hot water heater coils make fantastic high power resistors. They're around 8 to 10 ohms and can handle 3kw+. Super inexpensive too, around $20usd.

3:27. The green power resistor shown here is *not* looped back to the start to reduce inductance. You can see that the end of both strands terminate at the band at each end of the tube and those bands serve as the terminals that hook into the circuit to provide some degree of voltage separation in high-power circuits. These strands are in parallel to reduce per-strand current. However, it is a good idea to use a bi-directional loop to reduce inductance.

Another way to make a temporary high power resistor is to get a 5 gallon bucket. Fill the bucket with salt water and use to copper pipes as electrodes. You can change the resistance with dilution. This is used for battery bank test discharge loads.

I made a 1kw resistor load for my wind turbine made from galvanised steel wire wound onto a house brick. Worked well.

Why did you use cloth tape instead of polyimide (Kapton) tape? Kapton is heat resistent up to 400°C and there's no vibrations or abrasion on a resistor, so mechanical stress isn't a problem.

Glass can handle high heat, but not rapid changes in temperature. If you wrap nichrome wire around it and that wire heats up quickly, the glass might crack or even shatter.

I used to use incandescent light bulbs, needs lots of light bulb fittings but you can mix and match for the power you need. For low voltage I used car light bulbs. You can see when power is on. Sounds cheap but costs add up when you need a lot.

wow!!! I didnt know you speak spanish as well, I just checked your spanish version channel and its awesome, you know a lot, I really admire you, saludos desde Colombia!!

You could also submerge the entire thing in a big bucket of distilled water but use ceramic, glass or stainless. For ceramic solutions you could pick up unwanted pottery such as floor vases or larg glass piece from your local 2nd hand store.

There's quite a few flaws that were overlooked in this project, that would have been alleviated by going with the plaster/cement/terracota/ceramic option - That radiator is unlikely to dissipate 300w of heat from the resistor - The cloth can become a fire hazard due to the heat and/or melt - Many leak points (which you mentioned) around electronics (bad) - The watercooled vision is very large/unwieldy vs the passively cooled resistor - Higher cost - Requires seperate power supply for the pump + fan

I use to make high voltage resistor 110kv from pure water inside a pvc tube 1 meter long with glued pvc end caps with copper bolts sealed in each end. After removing the air a small amount of salt is doped into the water to achieve a desired resistance.

I love this channel!

Excellent explanation! I used nichrome wire to make a coffee cup warmer. The store-bought ones were either too expensive and/or didn't maintain a coffee temperature I prefer. It works great, and in this case, the heat generated by the nichrome wire is "a feature, not a bug." ;-)

Clay pottery handles temperatures of about 1,000 degrees F (the beginning of glowing red heat - about 540 C). Traditional, tribal earthenware is fired to about 1,400 degrees F (760 C),so you get clay water bottles,,on which nicrome wire can be coiled around.

I am liking the project

Copper ist actually diamagnetic since its permeability ist lower than 1. Seems Like a pretty OK choice to me. 😊 Eddy currents are another topic, but since the magnetic Flux density inside the pipe should be quite low and you dont want to use it as a high power AC load, the effect should be negligible. Nice projekt overall 😊 (please forgive language errors, im Not a native english speaker)

I had a wind turbine and its resistor was a thick wire about 5mm thick. And to stop the turbine when working on it the resistance was a solid bar of aluminum shorted across the terminals

I made a pair of heated gloves from ni-cr wire. It worked well but only had on off switch so was some times getting hot.

Way back when we needed a load for low voltage and high power, we used to sink a 1kW electric "bar fire" element in a bucket of water, Using R = V*V/P, the resistance was about 53R (UK, so 230Vac).

Interesting video 👌

ayy youtube's recommending you again. I had to search you up last time I watched. But, today, it's in on the home page.

Cement backer board will work well for a large dummy load.

Nice Video

You could use an electric furnace as your resistor for the wind turbine it's already nichrome wire and you can use it for heating food in windy days and even better you can use something called Phase changing Materials which is like a thermal battery that stores heat so you basically get extra energy storage for your system but in another form

Not sure if you already tested this, but nichrome expands quite a bit. Be careful that it doesn't create its own short due to that fact. I know its water cooled but 3kw is a lot of heat to dissipate .

I was just thinking about this yesterday. Great timing :) One silly idea I had was to run the wire inside a block of frozen distilled water. One kg would absorb 100 Wh as it melted. And then another 100 Wh getting to 80C. For short term tests, that might work well. (My particular use case is testing out USB C car chargers. They tend to overheat quickly at high loads. So 100 Wh would probably make most of them melt their plastic before the ice all melted…)

you can use those thermal pads to wrap the copper pipe, that way you will isolate it and be able to transfer more heat from the wire to the pipe.

nice video

Apologies if this has been suggested before, but why don't you incorporate a TEG and use the excess heat from the resistor for extra power?

Water + Electricity , nice combination 😂

Buy a bag of big old NPN power transistors, they are available very cheap now as they are obsolete technology. Big flat pack transistors are good for about 65w each if bolted to a big slab of metal. You can probably get 20 transistors for 20 dollars. That gives you an additional benefitmof being able to control them, ie ADJUSTABLE load

very good explain, Even if you apply oil on the PVC pipe, it comes off very easily thanks !

This is when a resistor becomes an active component.

May be use a ceramic floor tile for a support, stood on end with a fan for air cooling.

instead of grout for the tiles you have to use refractory cement with a little mesh inside.

You also may use a heater which may easily dissipate 2-6 kW and also heat utility water. Besides of being dead cheap.

Teflon tape (plumbers tape) as a high temperature insulator. For plaster find go to a hardware store and buy heatproof plaster , it is used for wood stoves, fire places, ovens and kilns.

An other useful device for this type of testing is a carbon pile, the type used for testing automotive batteries and charging systems. As you turn the dial it compresses the carbon disks and the resistance decreases. Basically a high current low ohm variable resistor.

el threadlocker es para pegar 2 metales y evitar que se desenrosquen con el uso o las vibraciones, por ejemplo se usa en varios tornillos de una bici, pero no es indicado para pegar metal con teflon, quizas ni se endurezca, tampoco esta pensado para estar en contacto con el agua. Una opcion podria ser utilizar solo teflon, o usar una aleacion de estaño con un punto de fusion bajo y calentarlo muy rapido, tambien puedes sellarlo por fuera con cinta autosellable para fugas

One more thing there is a thing called fibre glass sleeves which can withstand very high temp so you can use that for insulating the nichrome wires.

Submerge it in mineral oil

cool video (or hot ;) ) . Is there a link to that mega resistor? I have similar ones but smaller. I used plaster of paris mix with a little bit of fine sand. for my furnace. easy to find in store and simple to work with. Although it is not a strong as a real ceramic.

You could use many small resistors in parallel.

What about just short the wind turbine if the battery is fully charged and the turbine is only outputting low voltage (when there's barely any wind) so it ends up being that the eddy currents resist and stop the turbine from spinning

Hello try laser cut steel from jlpcb make a nece add and a good variable resistor

So do we call it reostate

Mixing metals isn't that going to cause a ton of corrosions?

u could have used expoxy or liquid plastic in an can to creat a layer of isolation betwen the pipe and the wires and made a second layer to to isolate from a second layer of nicrome wire

sure copper is conductive but its not ferromagnetic so it wont increase magnetic fields

nice

18:34 For the slider, just use a metal hose clamp.

Why you just dont try using a beer/wine bottle filled with water? as you say glass is good electrical and thermal insulator, if you put some water inside you will increase the heat dissipation, i guess could be more easier. btw nice job!

You forgot that cement without any reinforcement can't withstand compression force so it broke. What you could have done is put some kind of wires inside the mold as reinforcement and then fill the rest with cement mixture.

Winding resistor wire on glass can result in a hot wire cutting the glass.

More on hoverboard motor generator project 👍👍👍

You can buy nichrom metal band, but it is not an easy task to bend a nichrom metal band at the high side allround a pipe, Assume it increases the cost of production.😬

I make high power resistors myself from nichrome wire for diy project XD its not so easy or cheap to get a multiple hundret watt rated resistor at less than a couple ohms

Another idea is to find an amateur potter and get them to make some tubes and fire them for you.

Why not use in copper pipe Compression Fitting? No heat, no special tools and easy to use 👍

You can use plaster of parish for molding.

Resistor: " I will not stop resisting" Cop: "Chill bro"

That tape starts burning if that wire reaches 100c degrees

Make virable resistor

Or make the wind turbine able to rotate the fins to make it aerodynamic and it will not rotate anymore. This is how the big windturbines turn off.

can you add subtitles ? please.

Might look at kzfaq.info/get/bejne/f6elmJWH3dKpXZ8.html shows how to make refectory cement "dirt cheep" Could wrap the forming core with some parchment paper, wax paper, if the paper get's stuck you could just use a "burnout" process by heating it up to carbonize it and get rid of it. Could apply a some of the grout compound on top or looks and to give a less abrasive surface for the wire. There's also water glass from kitty litter that lets you create high temp sand casts. It's a bit more workable till it sets with CO2 & heat don't happen to have a good video I remember on it but there's several videos showing it you could use it instead of water with ceramic wool for smoothing like kzfaq.info/get/bejne/hpeGoKyKzcvZhWg.html shows for making microwave crucibles. Lastly and probably best Alumina kzfaq.info/get/bejne/g7OqetmfybrQg6M.html shows how to make it for crucibles.. It's basically how the professionals make the rods for heaters in kilns. Hope some of those are new ideas and hope you find something that works!

A jeszcze zapytam o skórę, czy na tatuażu rezystancja jest inna? ;-}

אתה רעעעעעעעעע

you need kapton tape

Rezystory rozruchowe w lokomotywach prądu stałego to 2 szafy ;-}

I like your channel but this is wrong in so many ways and likely result in a fire as Most plastics and cloth will melt or burn causing a short to the pipe. Nichrome will expand even before it glows and as it grows, spots can heat more then other areas and cause other problems as it heat cycles. Commercial power resistors have more things adding cost beside "not making enough units for the demands." Much harder to make them because of "Fire Proofing" etc to meet various Safety rules for a final product to Pass testing by TUV CE UL and related agencies.

23 and no tests 😢

Basta fazer uma placa de circuito impresso com padrões de trilhas densos de cobre e colocar uma ventoinha sobrez

Plastic is not a megaohm conductor. Not even gigaohm. Please try again.

For the resistor body... Maybe the fireproof brick that is used to line fireplaces and furnaces. This special brick is creme colored, not brown, or red. It is available in the USA at the big-box hardware and lumber supply stores and, of course, brickyards. They come in different sizes and shapes. One the size of a typical brick should be easy to wrap the wire around. Also, the fireproof mortar maybe useful. The green manufactured resistor may have special wire that does not have so much thermal drift. I am thinking that you are going to have a challenge with the wire that you are using, because it probably has a large heat coefficient. This may make it unusable. My guess is that the wire on the commercially made unit has limited drift and that this is the reason that it is so expensive. You can also repurpose a cheap space heater. Just be sure to use all safety measures, no matter which path you take. Cheers!

Copper is diamagnetic, so no induction problems.

How demonitise in 5 seconds :))

If you’re running water through a pipe, consider using a plastic pipe with the coil inside rather than wrapping it externally.

That was painful to watch... First of all that insulating tape will burn to crisp when that 'resistor' gets any substantial amount of power. You could have used lightbulbs, water heater elements, just dunked that wire into a bucket of water, steel wire or tape.

2nd!

amazing bro #first coment

3rd

There is SOOOO much wrong with this video. PLEASE for the love of all man kind don't copy this!

this guy dont know what its talkinb about, "can withstand more head than copper, has more reistance than copper" lack of education. the REASON whi nichrome is used it has little resistance change compared to temperature, A.k: small temperature coeficent. Guy dont know and just makes up things as he goes. Kids look video, learn, go to get job, and will be kicked out because random mumble that wont make sense.