Let's make a HUGE Resistor (High Power)

[@antibrevity]

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.

[@JeremyAkersInAustin]

Came here to say the same thing... Not sure where he got the idea that it was looped back?

[@sdjhgfkshfswdfhskljh3360]

It is sad to have misinformation in educational videos.

[@Thingstest-rl8xu]

Yes, most commercial power resistors are not make to control Inductance. Even then Reduce Inductance is likely not going to do anything for the application.

[@matthewf1979]

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.

[@nonsquid]

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.

[@SpecialeW]

And electrolyse the water and generate hydrogen? Sounds like a blast

[@mosta5]

That wouldn't be an ohmic resistor meaning that it doesn't follow ohm's law and V doesn't always equal IR in it so it will not be suitable for the calculations

[@EdwardTriesToScience]

baking soda is better (potassium hydroxide even moreso) as it wont generate chlorine and poison you, saltwater is fine for AC not DC

[@klave8511]

Better to use NaOH, no chlorine

[@AdamTheBot]

Yeahh I use this but in a big cup works perfectly fine .

[@peterdkay]

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

[@Jefferson-ly5qe]

Anyone repeating this should make sure not to breath in the funes. Zinc fever sucks

[@peterdkay]

@@Jefferson-ly5qe Did not realize that!! Fortunately my resistor only dissipated about 300W so only warmed the brick. Original galvanizing is still there. After 3 years i found domestic wind power was not viable and replaced it with 4.5kW solar which generated more power than I use,

[@Jefferson-ly5qe]

@@peterdkay yeah 300W sounds like it wasn't enough to cause issues but I suspect it would be if you put kW+ into it. Zinc fever is often encountered by welders who don't remove the zinc coating on galvanised steel before they start welding. Your experience with wind seems a common one. It's great rechnology nut doesn't work well at domestic scales.

[@chrishuhn5065]

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.

[@juansebastianraigozatabord3625]

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!!

[@ELECTRONOOBS]

:) gracias!!!

[@jamess1787]

He's a Spaniard, pretty sure. 🤔

[@Vic-sp6ld]

@@jamess1787 He is. I mean, his accent makes it clear.

[@klave8511]

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.

[@Guishan_Lingyou]

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.

[@paradiselost9946]

quartz glass... cough cough... "radiant bar heaters"...

[@nickblacklock7526]

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.

[@izzzzzz6]

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.

[@barrymayson2492]

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

[@mvrkmi]

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." ;-)

[@mysticMiner]

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)

[@Felipe2077tv]

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

[@ELECTRONOOBS]

That's right! Thanks for all the tips!

[@NiHaoMike64]

Could try using a water heater element if it would be of suitable resistance. Simplest would probably be a heat resistant frame to wind a mesh onto with a fan for cooling.

[@rethinkscience8454]

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.

[@barrymayson2492]

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.

[@junglerider007]

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.

[@prashanthb6521]

I used long cut vitrified tiles as the base. I just wrapped the nichrome wire around it end to end.

[@gf2e]

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…)

[@j1952d]

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).

[@ranganatennakoon]

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

[@donamills]

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 .

[@JohnDuthie]

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.

[@mosta5]

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

[@galileo_rs]

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.

[@self_taught_stuff]

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.

[@jglenn78]

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?

[@wizrom3046]

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

[@Eapancotech]

So do we call it reostate

[@salahuddinbangash4785]

Water + Electricity , nice combination 😂

[@chemarytech]

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

[@jamesmorton7881]

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

[@kau_norw]

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.😬

[@gf2e]

I was thinking about that. I bet the corrugated shape on the commercial resistor is asymmetric. The right shape of crimp will make the metal band curve around the rod.

[@joshadsett4835]

I am liking the project

[@y2ksw1]

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

[@mbunds]

I love this channel!

[@soumyaranjanmoharana4804]

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.

[@t1d100]

These can be found at automotive parts stores. They are used to wrap exhaust pipes.

[@-Evilempire-]

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

[@aycebenzsalud]

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

[@nuttyDesignAndFab]

why not wrap a plastic bottle? you can keep it full with water, which should keep the plastic from melting. Also the choice of copper doesn't matter for the core magnetics. like maybe it would matter for AC causing eddie currents, but that's just extra heating. not sure if this is cancelled by the winding.

[@carlwest859]

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

[@md.mostafakhan4529]

This is when a resistor becomes an active component.

[@pieterboots8566]

You could use many small resistors in parallel.

[@JohnDuthie]

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

[@Thingstest-rl8xu]

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.

[@leehewitt9559]

Interesting video 👌

[@daveluxton8317]

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.

[@Kmnri]

Submerge it in mineral oil

[@JoaoMoreira-mg4zj]

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

[@mubbashirshirazi3758]

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

[@soumyaranjanmoharana4804]

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.

[@andreadavid7868]

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!

[@MrAndrewAllen]

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

[@WagonLoads]

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

[@barrymayson2492]

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

[@ELECTRONOOBS]

Or use a brick! Is only 50 cents :)

[@arturperreira5680]

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

[@troublehd7236]

nice video

[@ResistanceLion]

Try to add plastificator and solidifier to your cement

[@Yorumcu63]

Nice Video

[@Seumu990]

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

[@legominimovieproductions]

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

[@سلطانخنيفس]

אתה רעעעעעעעעע

[@pastasauce99]

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

[@ELECTRONOOBS]

How is the CURRENT situation?

[@roo1871]

@@ELECTRONOOBS I'm AMPED up

[@ResistanceLion]

price goes higher if more people buys a thing, not vice versa, because otherwise when your point is to sell a product you'll have a storage space piled up with a useless junk that nobody wants and it just makes your work as a goods supplier less efficient. Vice versa for manufacturing - the more prepared and polished manufacturing lines you have for the product, the more efficient it'll be for you to make it, so at the lower price could be sold.

[@RdGear]

You can use plaster of parish for molding.

[@Orentas01]

That tape starts burning if that wire reaches 100c degrees

[@RobinGerritsen1995]

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.

[@AKG58Z]

More on hoverboard motor generator project 👍👍👍

[@ransombot]

Might look at kzbin.info/www/bejne/f3LYlmWMrdF4Y80 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 kzbin.info/www/bejne/hmK5nnyPncqoi5Y shows for making microwave crucibles. Lastly and probably best Alumina kzbin.info/www/bejne/g37deKmkmbmfidE 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!

[@yakut9876]

can you add subtitles ? please.

[@Sir-Dexter]

nice

[@t1d100]

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!

[@m4th1js]

you need kapton tape

[@nowheremanjk8624]

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

[@nowheremanjk8624]

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

[@markmaker2488]

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

[@MegaFoster86]

23 and no tests 😢

[@italogarcia1597]

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

[@xDR1TeK]

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

[@gervasotattico7070]

Copper is diamagnetic, so no induction problems.

[@whizatit]

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

[@paradiselost9946]

power engineering is a whole new ball game that really throws the average hobbyist that deals with chips and fets and coding... if the goal is simply to brake it at high wind speeds... easier to just short the generator out. if the goal is to produce heat, then forget about batteries and concentrate on making heat. a method that is far more suited to wind power, and can take advantage of the cubic law of power to wind velocity. and provides braking. and doesnt have a limit due to batteries and their charging status... what to DO with the heat is the challenge... throw it away as a waste product? this society thrives on throwing things away...

[@mikebond6328]

I’m doing it.

[@VEC7ORlt]

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.

[@thevoidedwarranty]

How demonitise in 5 seconds :))

[@galihaimar6701]

amazing bro #first coment

[@Service_John]

2nd!

[@noreenjitkaur8136]

3rd

[@Murphydeffa-oq8lm]

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.

[@ELECTRONOOBS]

Chill bro, I might have expressed wrong something due to my English level. But all I'm saying is that copper has lower resistance so it allows electrical current to flow easily through it without much energy loss. This energy loss is what generates heat and in this case we need the wire to dissipate as much heat/cm so we could use it as a high power load without the need of hundreds of meters of wire. Also, as I mention, copper could withstand less heat, since it would melt at around 1000 degree but nichrome could go up top 1400 degrees. And yes, "can withstand more head than copper, has more reistance than copper", nichrome has a lot higher resistivity than copper

[@paradiselost9946]

but nichrome is nowhere near as good as invar... or constantin, when it comes to thermal coefficients... so, why do we use tungsten for filaments instead of nichrome? whats the temp coefficient of tungsten? its irrelevant in that case. its all about its refractory properties, its ability to withstand heat without failure. could just as easily dump this power into copper or steel as an arc and melt the metal and use the arc gaps resistance rather than the metals resistance to liberate the heat... again, coefficient of temperature doesnt mean a thing... UNLESS the precise value of the resistor at any specific temperature is a critical value.

[@Murphydeffa-oq8lm]

@@paradiselost9946 tunghsten is used for other reaosn, Main reason is high melting point. low resistance at room temp is main reason why bulbs burn out. If you limit current they last way longer. But you cant use nichrome because of low melting point. And yes there are better alloys for resistors, constantan is one of them. Nichrome has high melting point, it also forms protective layer and has relativly "taame" temperature/resistance curve. Copper on other hand is terrible as resistor. resistance will change wild with temperature, it will oxydize in air. And it has low melting temperature. If you use copper heating element it may draw like 100kW and when it heats up its 1kW. If head conduction is not uniform one section will heat first and will burn out. Thats why low change in resistance is important, power will be disapated uniformly across conductor.