How to Make a Shunt Current Sense Resistor

I was going to buy some shunts and realized I had to pay money! So I decided to make my own…
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By: Mehdi Sadaghdar

[@ElectroBOOM]

Hello all! I drew the 10 winners for the MEEETAAAs between Patrons and viewers! Here is the list, which I have already contacted: - Marino S. - Yes Sir - Justin Bro. - TheLugal - Kevin Jo. - Guillaume No. - Patrik Kl. - Nate Pa. - MyDynamik1 - Mason Co. Have fun everyone!

[@hannnnn310]

ElectroBOOM How does you contacted them by email or by PM?

[@Jake.Sherlock]

Oh shunt. I just missed the Electroboom Meeeetaaaaaaa.

[@rubygupta9770]

Hey doesn't the current lags in an inductive circuit? 10:11

[@priyankashibu2439]

gimme da meter

[@beedslolkuntus2070]

ElectroBOOM ur videos are so good

[@squidsquiddly5970]

"The Dumber you are the more likely you are to invent a lightbulb" Best quote ever

[@squidsquiddly5970]

Thank u for the like! I am currently binge watching your videos! I saw the 1 million subscriber video. You should sing a song in Persian sometime! Ya got a great singing voice

[@floorpizza8074]

This explains why my house is full of lightbulbs.

[@squidsquiddly5970]

floorpizza And here I thought I was the only one! Lol

[@SlippinJimmy.]

I knew Edison was a moron.

[@squidsquiddly5970]

Jimmy Johnson I couldn't agree more

[@MM0SDK]

10:10 "You can clearly see the yellow current line leading the green voltage line, as should happen in an inductor" I'm confused. I thought current lagged voltage in an inductor, as it seems to show on the scope. Am i missing something.

[@muluskuvuch]

i was confused about this too. ELI’s ICE and all that. but the scope seems to be showing a leading current?

[@MM0SDK]

@@muluskuvuch I'm not alone after all. Would like to hear others too on this. I see the scope showing a leading voltage (green leading yellow)

[@MrCh0o]

I think it was just a bad choice of words. "Leading" as in "being further ahead on the time scale", which translates into being late, or lagging. That's my take on it

[@skuula]

He said it the wrong way round.

[@mabs239]

What seems pictorially leading in graph is actually lagging vs time. Think about it!

[@sausagedog52]

GIMME DA MEETA OR DA SCOPE!!!

[@connivingkhajiit]

Thomas Sears furry nigga

[@sausagedog52]

Michael Remington k

[@CShand]

I would like to see him check how much current his car pulls through the battery and alternator.... Because it's always interesting when the car gets involved 😂

[@Verrisin]

... They say you learn not to touch hot things, because it hurts, and it's a reflex..... then, there is: 0:37 - 0:45 - Let's be real here: That's just impressive. XDXDXD

[@doriantech9064]

We used a *SHUNT* resistor in a SMPS project.

[@emilracovita8421]

GIMME DA MEETA OR DA SCOPE

[@sunconure3995]

Did you record this a dawn

[@michaelmiguelicutti2829]

Hilariously entertaining as always, but why not just solder a bunch of .1 ohm resistors in parallel? When in parallel resistors of the same ohm value stay the same but can handle more power. That way you don't have to deal with all this wire and no need to worry about inductance.

[@servosseconds4304]

me when I realized how many bland girls were in my area: 7:24

[@Laughing_Cat_Meme]

😬Sir😑🙇‍♂️🙇‍♂️🙇‍♂️🙇‍♂️🙇‍♂️

[@broxy5450]

First time I heard the beginning I thought he said "hi I want to take a shit"

[@abdullaalmosalami]

10:10 Shouldn't current be lagging the voltage in an inductor? It is capacitors that have leading current. (ELI the ICE man)

[@abdullaalmosalami]

Ok so just thought about it for a sec. Voltage "leading in phase" would appear on the scope as the voltage reaching a particular point BEFORE the current (for example the peak), hence the current wave form's corresponding points should come after the voltage waveform, which is what is shown.

[@theikrman9132]

It’s burning now *proceeds to touch burning resistor*

[@bruh-mx7bd]

*procceeds to touch it 3 times in a row*

[@nileyellow2703]

Starts cooking human finger

[@timmyg8888]

Mmm... BBQ roasted Mehdi

[@chantaysmith9158]

🤣🤣🤣🤣🤣🤣🤣😆

[@0divide136]

@@timmyg8888 finger barbeque

[@55yxalaG]

0:38 - realizes that the resistor's too hot to touch 0:41 - touches again 0:43 - continues to touch

[@partisancrown2674]

His brain: touch it Him: why? His brain: cause you have too Him: ouch His brain :do it again Him : ouch Also his brain: do it again Him :ouch

[@55yxalaG]

@@partisancrown2674 *_cause you have to_* - the thought that runs through every one person's mind before doing anything stupid

[@partisancrown2674]

I agree

[@kimchan9859]

.😂😂

[@bermchasin]

6:10 melts fingers

[@GodlikeIridium]

6:15 that looks as if it did hurt... a lot

[@mmawad100]

actually from experience not that much or not at all, the temperature will be very high but for short time like a flash and something will break the circuit so just the outer layer of the skin is burned up and you you just left up with shame and the bad smell.

[@dopiaza2006]

@@mmawad100 It's a great smell. I think the heat kind of cauterises the nerve endings too which means less pain. Or I may have just made that up.

[@timmyg8888]

Because it did

[@Xnoob545]

​@@mmawad100I've burnt myself with a wire before During the burning it didn't hurt, but it "felt very wrong", can't really describe it Afterwards it started hurting more and more and the pain increased continuously for like 12 hours After that it started dropping but it was still kinda painful for a while (days) It wasn't super bad, it's like cutting yourself with a knife a bit, like on accident in a kitchen

[@gabumoh]

"The dumber you are the more likely you are to create a light bulb" - Mehdi Sadaghdar

[@rasta1979]

lol yeah I love it, Mahdi do it on a T-shirt I'm buying

[@i.apilado]

Is he talking about Thomas Edison? Haha

[@fcweng]

Bingo !

[@redsquirrelftw]

I have the same variac, I think I'm doing it wrong. i.imgur.com/0g7FugJ.jpg

[@retrorizeit4547]

2018 A.D.

[@RyuAzuku]

Sh** + Cu** = *SHUNT*

[@susanoo3583]

nice explanation

[@untrust2033]

Next time I want to call someone a s****c*** I can just call them a shunt :)

[@gigaacademia9313]

@@untrust2033 u better not do it to me I play league of legends I'm toxic so that's a warning

[@j.epstein7723]

@@gigaacademia9313 be quiet, shunt

[@romeearlgarrett4067]

Fu

[@shiiriogami1422]

electricBOOM but every time he says Shunt it gets bass boosted

[@bills.7593]

dankvader 214 I need that xD

[@asianboi2867]

Imagine dis: ElectroBOOM but everytime he says shunt he gets shocked or burned.

[@J.Crystal1248]

@@asianboi2867 or gets SHUNT!

[@asianboi2867]

@@J.Crystal1248 or he has to witness his Tesla coil getting destroyed?

[@J.Crystal1248]

@@asianboi2867 Nah, this'll be devastating in all aspects ;)

[@--Mike--]

"unfortunately im in luck" :D

[@johnrubensaragi4125]

7:24 -unfortunately- *AND fortunately*

[@xaza5625]

It would have been so much funnier if he said unfortunately. I'm going to start using that now lol

[@therealspookspeak]

task failed successfuly

[@Talik13]

I can almost never understand what's actually going on here because I have such a small grasp on electricity. But I can't stop watching them. I love watching these videos, I feel like I actually learn a little bit

[@Hitmann11]

I couldn't have said it better

[@tiguymondou]

Exactly what I was thinking right now.

[@PastenTube]

Yep, exactly my thoughts as well :D

[@rudrakshkanekar2239]

Subscribe Kurzgesagt for more such things, ignore if already done.

[@jinniw.492]

My old electrical engineering professor always say with transformers: "Once your transformer starts smoking; it's hard to put the smoke back in."

[@Ziplock9000]

Yeah because it means the insulator has burned off, causing short circuits in various places. There's no good way to fix that.

[@musicman59753398]

John Michael Stock no shit. It’s a joke

[@EifelBlaulichtTV]

Yeah. There's a little truth on that. Unfortunately, Transformers don't have any opening to refill that smoke ;)

[@Mbnewman087]

you let out the factory smoke!! you cant fix that!

[@yxcvbnmmnbvcxy544]

Every electronic component works with smoke, but once it's out it's broken. And they added no refill valves because the want you to buy new parts

[@ElectroBOOM]

Hey All! at 10:10 I said the current is leading in an inductor, where it is clear in the scope capture that it is lagging, which is correct! Not everything on the right side is leading... time starts at the left side of the screen and increments to the right, like any normal plot!

[@Maklaka]

Gimmedahmeettaahhh for being the pedantic shunthole who caugh it! :D I am a poor, unemployed engineer who doesn't own a fancy LCR yet :'(

[@samarjain5259]

Hi Mehdi, can you just look into a product that says it can decrease current consumption and thus reduce the cost of paying utility bills? I don't have the equipment to test it at home... This is the box it came in photos.app.goo.gl/OWe8679034jHoOWg2

[@dhruvnehate6615]

OK , got it.

[@Dedsec-mk8qg]

ElectroBOOM I love you man you make me laugh every day and I tried the vacuum thing but I failed but I like your videos keep up the good work

[@justinmatthews2380]

ElectroBOOM do you know anything about cathodic protection? If so could you help me on my cp1 test?

[@eliasbeas3556]

Mehdi, I just recently graduated with my Bachelors degree in Electrical Engineering. Watching your videos makes me even more proud of being a Electrical Engineer. Please keep 'em coming lol.

[@almighty3372]

YEAH, just be careful not to burn yourself like he did....or else you house....or your workplace.....

[@Perktube1]

Almost scared the shunt outta me.

[@Dude-Smellmyhelmet]

Perktube1 Shunt the flux up.

[@nvb_01]

good one 😁

[@hassaanrauf4349]

Oh shunt Up

[@Thirst4livingwater]

you're such a shunt head

[@cyanisntcontent_creator]

You're a DC-head!

[@andrewkemp8677]

This video gets even more interesting once you observe the clock in the background over time.

[@drkaranmannan]

some 3-3 and half hours of footage for 11:16 mins of video

[@ElectroBOOM]

Anyone noticed half of it happened the next day?!

[@vkmicro2]

yes indeed xD it goes from like 4:30 pm to suddenly like 1:30pm towards the end of the video. Time traveling much? :D

[@SainnQ]

Probably somewhere at the point where he put fuckin' sear lines into his goddamn fingers. Christ

[@vkmicro2]

that made me feel the pain just looking at it!!

[@andrewcomo9767]

Who watches his videos for both info and entertainment?

[@arielwolf24]

Me

[@danserig275]

I

[@gyroboterupter2000]

Infotainment god

[@lesleycurry7849]

I do, he's my favourite you tuber!

[@andrewcomo9767]

Thanks for all the likes!

[@CriticoolHit]

I know you're very smart. And the seemingly dangerous things you do are done knowing the limits. But my ass was puckered tight none the less when you reached for that live wire, fully knowing you were going to get burned.

[@DerClouder]

I had to watch this twice because the first time around my attention was fixated on the clock in the background, no doubt put there on purpose.

[@ElectroBOOM]

if it makes you watch twice, that was a good decision!

[@JJJonnyify]

Clouder I was just looking down here if I am the only one :D

[@bradhulton1113]

Clouder should get the meeter. He is making people double watch the videos. :)

[@moayadkhd8904]

ElectroBOOM can you explain why vape are exploding?

[@joshualeefyi]

Funny I had to watch it again to look at the clock LOL

[@amarug]

"...infact, the dumber you are, the more likely you are to invent the light bulb" - Mehdi Sadaghdar, 2018

[@kaerymetal]

We need a shirt with that phrase

[@GabrielMoscardiPauka]

Tesla > Edison ‘nough said.

[@reecekepnervlogs8660]

Raoul I

[@squidsquiddly5970]

I hope that one day I find someone like Mehdi. The man's a legend

[@gametabulas]

Squid SQuiddly Same..wish i had a professor like him but instead my professors were paranoid beings who wont even let us work on high power labs like power system (advance) lab,etc and our role was only to note reading while lab attendants do all the interesting stuffs!

[@shawnscientifica6689]

(Walks in room with transformer and burnt fingers) So, let's (zap) SH*** OH F***!! SH**! I was supposed to turn that off before I spoke to you.

[@SreenikethanI]

*Shawn Scientifica* I can already hear him speaking with his accent in my head

[@CellyWelly]

Squid SQuiddly icu everywhere

[@jayeetadasdey9961]

Your face is like a octopus

[@Magneticitist]

I'm still impressed at this mans pain tolerance. Those burns from the wire are no joke.

[@MassimoRicciardi-y6k]

Happened to me yeah it's not fun trust me lol.

[@deisum]

I'm so excited I shunt my pants!

[@Smico85]

"The dumber you are, the more likely you are to invent a lightbulb." - Mehdi Sadaghdar, 2018

[@AngryDavid808]

SO FUCKIN' TRUE! 😎

[@AngryDavid808]

zztop3000 ElectroBOOM is actually called: Mehdi Sadaghdar. Got it?

[@bobi_lopataru]

0:44 there's a beep without his mouth moving, maybe the resistor got offended and swore because a unibrowed iranian man touched it multiple times

[@nder4786]

4 years of engineering school or 10 min KZbin :/

[@samshanker5753]

:(

[@the_ALchannel]

Actually the current in MOT looks like that because iron core is too small and it begins to saturate near to the peaks of input voltage. Microwave oven manufacturers try to save money as much as possible, and transformer steel is not cheap. Hope this comment doesn't get lost in gimmie shit. UPD: to not get you confused, of course I meant "near the voltage peaks considering the phase shift between voltage and current". Thanks for likes, guys!

[@zx8401ztv]

No it hasnt, thanks for the info :-D

[@the_ALchannel]

Also there is a simple way to show this: take small (5-10VA) 220-12V iron core step down transformer, and slowly raise the voltage on its 12v winding with your variac, starting at 0V, monitoring the current; if the transformer is good, at 12v you will see nearly a sine wave current, but as you will go higher, the current will become more and more like shown in the video, because beyond nominal voltage the core will start to saturate.

[@zx8401ztv]

Thankyou, i have saved your text to file for later use :-D

[@wavexphonk]

Roses are red, violets are blue, gimme da meeta, so I can make BOOM. Lol plz can I have one. :-)

[@1976kanthi]

"I want to make a s****. I said SHUNT!" ~ElectroBOOM, 2018

[@BruhMoment93_]

Probably one of the funnier things electroboom said

[@raidcoustpazifik]

ik everyone wants to have da meeta... but did anyone notice that he actually BURNT THAT WIRE INTO HIS SKIN?? papa was an electrician, was a little worried there that you've genuinely hurt yourself. next video, show how your fingers healed :D

[@Sublimnalxx]

I know, that looked horrible. Like his skin was plastic and the wire melted itself into it.

[@markmorton2519]

Yeah I always thought all the grabbing of burny bits was more sleight of hand, for our amusement... not so sure now I kinda feel bad for encouraging this kind of behavior. But I’ll still gladly take a meeta:)

[@Reth_Hard]

You know, some people really enjoy to feel pain. In almost all of his videos you can see him getting electrocuted or burned so either he's very stupid, which I know he's not, or he's sadomasochist. I bet he's having a donjon room in his house... :P

[@dogsarebest7107]

I think it's more he sets MOST of those up, yes he usually gets bit, but he designs the skit with that in mind to mitigate most of the risks. I do not think he MEANT to do this one, though. This one is probably the worst, or second worst, him grabbing the falling MOT jacob's ladder was probably not planned, either

[@markmorton2519]

@Step Two And A Half Yeah, I think you’re on to it, he showed the injury because it’s NOT the norm, he got bit and wasn’t really expecting it.

[@mohitbling6658]

gimme da meeeta . gimme da meeeta . gimme da meeeta . gimme da meeeta . gimme da meeeta . gimme da meeeta . gimme da meeeta . gimme da meeeta .

[@Doomroar]

Wow you really want his meat don't you?

[@UniCrafter]

A very cunning shunt indeed! Almost as cunning as providing free tools to a student! Plz

[@simaspudziuvelis8249]

_freely transfer the possession of an instrument designed to measure electric current, voltage, and usually resistance, typically over several ranges of value!_

[@nopeahuoli]

Simas Pudziuvelis he deserves it

[@satyanshuyadav3368]

BANANA'S ARE YELLOW LAMBORGINI'S ARE TOO GIMME DA MEETTA SO THAT I CAN BE LIKE YOU (PLZ I NEED IT)

[@nepnet9903]

GIMME DA MEETTA! Also thanks for the information in that video about canceling inductance .

[@barrymooring2915]

6:00 min in...I'm going to use my auto-transformer that can out put some High AC currents.....(sounded like a bad idea to me, then I hear)..I have some 22 gauge wire (Bare)....then F#&%!! Sh#%!!....I laughed so hard that I nearly pissed myself...... I hope his fingers healed well, you gotta love this guy ! Smart and funny^^

[@jay00146]

U look like dictator of electronics

[@ПетрКарапупкин]

Exactly! :)

[@thatguy6104]

Is the stupid p2w app store company called GLU actually an popular thing?

[@SreenikethanI]

He doesn't LOOK like… he IS the dictator of electronica

[@jkobain]

FULL bridge RECTifier!

[@joao.henrique]

no current for you! NEXT!

[@guitarstitch]

Holy SHUNT. Those finger burns are nothing to play around with... I have a few workable meters, but getting a decent oscilloscope would be the SHUNT. I could put that to use in my audio endeavors, particular when I have a power amp acting up.

[@PyroTronix]

guitarstitch O

[@niek9388]

It's all fun and all that he gets electrocuted from time to time but he surely knew this was going to happen. I would advice him not to do these things or step down the voltage beforehand so he won't get burnt and it would still be equally funny. Mehdi, I like your videos even with less explosions, just want you to be safe.

[@alwaystraveling9040]

You are the Best teacher i have witnessed In a lifetime of YT education! Doing things like wire in mouth. "Shock" a ignorant brain into retaining the important information you quickly inject. You knowingly burned yourself in the same video to remind those of potential dangers. Combining Entertainment and knowledge at a fast pace. This is the first video i have seen by you , And you have earned my first ever Comment as well as a lifetime Sub! I hope you go Viral and NEVER stop Teaching!

[@Arhentir]

7:45 can u see light bulb in auto-transformer?

[@vvv331]

its the winding overheating

[@farrel7829]

that is a fire from transformer

[@gavinbennett2302]

my moms boyfriend stole my multimeter 2 years ago

[@earleroy]

iCube Gaming assailed

[@DaftHacker]

Damn 2 years ago, you def need one stat.

[@gyroboterupter2000]

I’m 14 and my physics teacher uses your videos, but I knew this channel since I was 12. I love your channel, it’s a good example of infotainment!

[@mohammadmohammad9584]

I can’t believe how interesting learning is ..... I can’t stop watching and the sad thing is I’m learning so much from this guy 😭😭😭 wish he was my teacher in college lol

[@pixxelss_]

3:39 What?.. He said that he likes extreme Shunt.

[@firtalaionatan8283]

Me: *working on a project* My mom: what are you working on? Me: 0:05

[@technicallydifficulties7094]

Me : *doing some soldering on a relatively safe project* Mom : YoU nEeD sUm SaFeTy bOi Me : But it's fine, i know what I'm doing Mom : U R 14 quit the balktalk i am the authority [even though I have no idea what electricity even is]

[@Marcus-pv9le]

@@technicallydifficulties7094 bro same here I wanna build a human flight system for my hands and feet for example like iron man so basically a flying like iron man project but then she says you'll get hurt like i know what in doing I have all the mats hydrogen and oxygen energy transifmromers and servos

[@lvbboi9]

@@Marcus-pv9le *_e x c u s e m e_*

[@wesleymays1931]

a *S H U N T*

[@hubb8049]

I'm making a sh*t

[@icantellyouhadenoughytfort8539]

GIMME DA MEETTA OF WIRE WITH A RESISTANCE OF EXCANCTLY 10 μOHMS SO I CAN MAKE A *SHUNT*

[@tofufrikadelle7045]

IcanTellYouHadEnoughYTForTodayStopWastingYourTimeAndMakeSthOutOfYourLifeNowAndDontReadMyNameAgain haha dat name

[@dick8641]

IcanTellYouHadEnoughYTForTodayStopWastingYourTimeAndMakeSthOutOfYourLifeNowAndDontReadMyNameAgain xD

[@ultimaker7179]

IcanTellYouHadEnoughYTForTodayStopWastingYourTimeAndMakeSthOutOfYourLifeNowAndDontReadMyNameAgain omg haha

[@sammielynch2552]

Gimma da metta!

[@superstars6175]

SHHHHUNT!!!

[@kadebrown6162]

6:14 be safe!!!

[@gametabulas]

Dude you're awesome wish i had professors like you!

[@mufasaiam7794]

How many SHUNTs can a man drop in one video?

[@ElectroBOOM]

You know what? maybe if I change my vocabulary to SHUNT I wouldn't have to bleep my videos and save some time there!

[@mufasaiam7794]

ElectroBOOM that's assuming KZbin algorithm can separate SHUNT and s*it.

[@cediddi]

It can't even separate shit from good (in content quality)

[@nineten1416]

32 CAUSE IT HAS 32 LIKES

[@marinac013]

GIMME DA MEETTA so i don't have to use myself as a shunt to measure current

[@marinac013]

Rohini Kanekar Awwww, look at this cute little green troll ^^

[@thatguymich2829]

I love the “Shunt” with the Metal Gear solid logo font lol

[@CostaCostaCosta]

The clock behind was like watching time porn. So interesting comparing the real time with the video's time. Shows how much work each video takes. Great job Mr Boom!

[@hetzz]

da Costa had to rewatch to enjoy the Travel or time.

[@BiRDiEHere]

0:05 *SHUNT!*

[@lonely_7891]

0:01

[@danek_hren]

@@lonely_7891 I want to make a 💩

[@michalbotor]

0:01 this reminds me of these silly forced captions one can sometimes see in the programmes whenever, the otherwise articulate, foreigner is speaking. ^_^

[@JawedHuda]

6:35 lmao that burn will reach Edison in his grave.

[@thischannelisdead2839]

Oof

[@timmyg8888]

If@@thischannelisdead2839, then why is it still alive?

[@thischannelisdead2839]

@@timmyg8888 good point

[@NanoMine]

I learn more from his videos than I learn from teachers. Also Gimme daa mettaa.

[@mrchiefmaker3702]

you can tell there's a giveaway just by looking at the comments

[@johnt.inscrutable1545]

I know I missed the drawing, but you still deserve kudos for a funny, engaging, informative video for up and coming electrogeeks like me. They are of filled w knowledge and humor such that I can't wait to binge watch all your vids. John

[@Wflash00]

0:38 He burnt himself THREE TIMES! I feel stupid if I do it the first time 😂 I love you Electroboom, even if this video is old as of me writing this

[@Colaaah]

Subbed and this is the 3rd video I've watched of yours so far... You are a very funny guy, and very informative whilst happy to continually electrocute yourself for our amusement lol! That burn in this video looks a little hurtie, hurtie though 🤬 lol. Cheers from down under. Melbourne, Australia.

[@onlyfunNfriends]

Gimme the metta! But do dangerous things to just entertain us..be safe dude we care..

[@masterzz57]

0:40 there’s bleeps, even though he didn’t say anything :D

[@cheeseman7162]

the bleep makes it even funnier 😂

[@TurboDoggo]

7:25 “Unfortunately, I’m in luck” lol

[@user-lg7cb6sr5z]

He said "and fortunately", not "unfortunately"

[@sawyernorthrop4078]

@@user-lg7cb6sr5z I know you're right but I don't want to believe you

[@kas-lw7xz]

Half a mether

[@thedarknightnicht]

Do you really burn your fingers just for the views? Isnt that a bit insane?

[@Undy1]

Would you watch him if he wasn't?

[@depausvandelilithkerk5785]

TheJoker1432 insane is the new sexy I guess.

[@GigsVT]

even worse smoking a $500+ variac... those big ones arent cheap

[@Gooberpatrol66]

I watch him have staged "accidents" and curse a lot. I didn't think he was actually injuring himself.

[@dustinsmith8341]

Normally he doesnt. But sometimes he does.

[@NikolaTheLegend]

Shunt up and give me presents.

[@kayeleva9006]

WE NEED THICCNES !

[@stevenpotter8228]

lol 😝

[@skrounst]

If you don't make a shirt that says "I Don't Give a Shunt", with the diagram at 1:23 drawn on it, it'd be a missed opportunity imo.

[@VoidHalo]

He's setting his autotransformer to 100 amps despite the side saying the fuse is rated for 25 amps. So I'm guessing the smoke from his transformer would be from the wire he used in place of the fuse to let more than 25 amps through. In other words, the illusion of stupidity is broken!

[@Pageportal455]

Nothing\ no! The 25amps is the maximum input current and not the output current. So 25 amps at 120v which equals a power of 3000 watts. So as long as the output power is less than that, you are good to go ans everything is safe.

[@solarfluxman8810]

Amazing Tech - What you said would be true for a transformer with separate primary and secondary windings, with VA-in equals VA-out. But since this is an auto transformer, there is just one winding and a carbon brush. The winding and brush current rating is limited to some maximum value, regardless of the voltage setting, otherwise you will let the smoke out.

[@0x8badf00d]

Solar Fluxman, an autotransformer is not an exception to the rule.

[@defaultuser000]

The smoke and a spark at one point, seemed to be coming from the point where the carbon brush touches the transformer windings. This point is usually the failure point due to the resistance of the sliding contact. And an auto-transformer isn't an exception to any rules. If you have a transformer with 2 windings that takes 120V/25A(3kw) input and it's rated to output 100V/30A(3kw), and then you load the secondary down to the point where it is outputting 30V/100A(3kw) the transformer will probably go up in smoke. It's still outputting the same power but the secondary wire isn't thick enough to handle the extra current, even though it's the same amount of power. This applies to an auto-transformer/variac just as well. Since it's a single winding of a single thickness of wire, there is a point where the current flow will be too much for the wire thickness to handle, it will get hot, and it will fail. This maximum current point is independent of where you have the output voltage set and at lower voltages can occur well below the rated power output. The resistance of the carbon brush contact also has current capability that is independent of the voltage. Current flowing through a resistor creates heat. The copper transformer windings, the carbon brush, the connections inside, ect., all have some parasitic resistance and therefore have a maximum current carrying capability that is independent of the output voltage. The variac isn't an exception to any rules, it's just following the same ones that apply to any other transformer or circuit in general.

[@stevenjohn7770]

*G I M M E D A M E E T T A !*

[@LinucNerd]

The memes never die... *F U U U U U U U U U U U U U U U U U U U U U U U L L L L L L L* Bridge rectifier.

[@practicalsoftwaremarcus]

Actually, the current is delayed in relation to the voltage. The scope waves seems like its the other way around, but the curve that comes "first" (when looking from left to right) is the actual leading wave.

[@jackyorgesen509]

I was about to say the same thing, eli the iceman, voltage leads current in an inductor

[@MagicLeavez]

You went crazy with the edits this time! for a guy that doesn't like post processing this is amazing!

[@malcolmw513]

It's really, really weird that Mehdi released this video now. For the first time in my life I have needed to measure some 12V loads at greater than 10Amps because of some LED bars I'm using. This was a week before the video was released. I knew I subscribed for a reason!

[@jessstuart7495]

I used some 12ga wire, and a couple of spare banana plugs to make a shunt to install across my DMM's 10A current meter inputs. I used a power supply and 2-ohm power resistor to put 1.000A through the current meter, then adjusted the length of my shunt until the meter read about 0.1A, with 1.0A actually flowing through it (divide by 10). I had to trim and resolder the wire multiple times, but after about 5 tries, I got to 0.098A and called it good. This allows me to make current measurements beyond the range of the DMM with reasonable accuracy (5% maybe?). This shunt only works with this one particular DMM, and only on the full DC-amp (not mA or uA) rotary switch setting. I don't think I would use this to measure anything over about 40A for any extended period. The shunt would start to heat, and it's resistance will increase, causing error. I always plug the shunt into the DMM first, then the leads into the top of the banana plugs of the shunt. That way, I don't pop a fuse on the DMM if the shunt comes loose.

[@DETRIVNI]

6:33 lol

[@shadowshade5739]

Show me the electo wae!

[@UltimaDoge]

LoVe IsADruG Brudda Do You know de wae?!

[@Hyperus]

Rene Stamer I literally came from a meme Video to here lol

[@MyHandsAreStuck]

Loving these more educational videos

[@Otakutaru]

Gimme da meetta! Ouuu wait... that USB oscilloscope seems pretty handy so... GIMME DA OSSELOSCOPPP EINSTAAAD!

[@KEITHTB12345]

i like extreme shit too lol.another fun and awesome video.

[@T-Waldo]

My very low income friend just blew up my meter. He replaced it with a $10 harbor freight one. Also Mehdi, my friend who teaches electronics uses your videos in his class.

[@ZirconGames]

Man i really need DA METTA or the osciloscope to make a flyback driver, then make a nitric acid generator with it, then make silver nitrate with the nitric acid+silver (silver removed from old x-ray films), then make a telescope mirror (silver to reflect) to make a telescope. pls, a lot of science going on here :) just need the tools

[@ZirconGames]

also it will be extremelly useful for future projects.

[@syfax3697]

Wow some serious stuff man good luck. Make sure to share that with us in your KZbin channel :)

[@The_Chemist_]

So, the grinding, polishing and figuring stages are already finished? ;)

[@PunakiviAddikti]

Damn, you're essentially crafting your own telescope? Nice, good luck and remember to never give up.

[@ZirconGames]

silver already melted, grass is shipping with the abrasives, all the necessary tools are ready, i'm only 15 lol i'm out of money, just the glass blowed up my budget so.. a lot of hard work coming

[@velizar314]

my multimeter burned up... soooo *GIMME DA MEEEETA*

[@larrythemanic6.0mechanic78]

I always wondered how a Graphics card could read how much current it's drawing and this video helped me under stand unintentionally... Awesome!

[@milaandahiya]

How is this guy not dead?

[@sodiumtetraborate3392]

*FULL BRIDGE RECTIFIER INSIDE A SHUNT*

[@kewakl8891]

I would rather have the METHER from 7:32

[@ansaralam6342]

1:34 to 1:36, If you notice the clock in the background, you can see that he can time travel.

[@themagnificentpapyrus2432]

6:11

[@JoanRubra]

We need thickness!

[@Spod23]

SHUNT

[@Zizzily]

GIMMIE DA -SHUNT- MEETTA!