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

[@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.

[@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

[@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.....

[@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?

[@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

[@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

[@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!

[@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!

[@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.

[@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

[@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!!

[@MagicLeavez]

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

[@BenBeath-y6r]

Can I just say, 6 years later I'm finding your videos very helpful. Thankyou for making them and while I appreciate the humour I really needed the science in it too! thankyou

[@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

[@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

[@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

[@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

[@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.

[@gametabulas]

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

[@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!

[@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.

[@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.

[@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.

[@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!

[@thatguymich2829]

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

[@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

[@nepnet9903]

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

[@shiiriogami1422]

electricBOOM but every time he says Shunt it gets bass boosted

[@xydors]

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 ;)

[@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^^

[@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

[@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

[@Arhentir]

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

[@vvv331]

its the winding overheating

[@farrel7829]

that is a fire from transformer

[@jacobbjur9778]

Dude I love these videos. People on here may think your unknowledgeable but they have no clue. I work for Eaton as an electrical tester and I can tell you know your stuff. Keep up the videos man I get great enjoyment out of them and learn a little at the same time.

[@BiRDiEHere]

0:05 *SHUNT!*

[@lonely_7891]

0:01

[@danek_hren]

@@lonely_7891 I want to make a 💩

[@pixxelss_]

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

[@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.

[@newlife19891]

In Australia we tend to use mm2 (surface area) for thin wires and AWG for thick wires

[@--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

[@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

[@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

[@CharlieTechie]

Haven't watched in a while, but as always you are so entertaining and explain with such enthusiasm.

[@NanoMine]

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

[@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!

[@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.

[@elebeu]

Of all of the Electrical Shunt videos on KZbin, I chose this gentleman's because along with the theory of operation, I knew from previous experience, that I would also be entertained by sparks, fire, and burns.

[@karthiks2822]

10:09 "The Yellow current line is leading the voltage green line as should happen in an inductor" But in an inductor, Voltage always leads the current by 90 degrees

[@kadebrown6162]

6:14 be safe!!!

[@1976kanthi]

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

[@BruhMoment93_]

Probably one of the funnier things electroboom said

[@sumeerarora8865]

Hey mehdi sir,I am in class 12th from India and by watching your videos I have suddenly gained more interest in electronics than before , inspiring me everyday to achive my goal for a mechatronics Engineer, you are great❤️❤️❤️❤️luv from India🙏🙏🙏

[@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?

[@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

[@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

[@goingmentalwithevan]

I'm homeless but I carry my little mobile electronics lab with me. I have a decent oscilloscope and tools, it's a work-in-progress.... But I would really really really love to have a nice multimeter! I never win these things and even if I don't win, I still love your videos! I watch every single one sometimes multiple times, you always cheer me up. Much love!

[@MyHandsAreStuck]

Loving these more educational videos

[@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!

[@masterzz57]

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

[@cheeseman7162]

the bleep makes it even funnier 😂

[@xenstudio]

3:26 is the exact moment I surged the circuit breaker to my rental

[@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.

[@UniCrafter]

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

[@deisum]

I'm so excited I shunt my pants!

[@TomsLife9]

another advantage of the shunt is that you can pluck the voltage off and feed it into an A to D converter, Arduino, etc for monitoring and recording.

[@electronicsNmore]

Better off using resistive wire like A1 Kanthal or Nichrome to make a wirewound resistor.

[@Danial3w]

electronicsNmore But he doesn't vape xD

[@electronicsNmore]

Danial3W 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

[@kayeleva9006]

WE NEED THICCNES !

[@stevenpotter8228]

lol 😝

[@ihtsarl9115]

Thank you for Posting this video. I buy from the store a 0.015/5w resistor and measure the millivolts across it to measure currents.

[@spikerbrad23]

Holy shunt, I need those tools.

[@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

[@chanakyasinha8046]

0:04 😹😹 i laguhed, the voice entered my stomach

[@JAMALS_BROTHER11]

0:05 SHUNT 0:13 SHUNT 0:22 SHUNT 0:50 SHUNT 0:54 SHUNT 1:18 SHUNT 1:37 SHUNT

[@rijugamerplayzzz1164]

06:35 Thomas Edison got roasted for 6 secs

[@themagnificentpapyrus2432]

6:11

[@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.

[@hayunblogdemarcelo]

Made myself one, work perfect. Thanks for your inspiration and burned fingers! Cheers from Argentina!

[@Otakutaru]

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

[@mrchiefmaker3702]

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

[@kewakl8891]

I would rather have the METHER from 7:32

[@samsmusichub]

I'm really happy he didn't die.

[@NikolaTheLegend]

Shunt up and give me presents.

[@Shane-zh6tx]

Can someone explain 4:45 to me? If both terminals were in his mouth wouldn’t there still be a path for current to flow?

[@XxMine231xX]

his body resistance, resists the voltage, therefore no current flows because voltage is required to push current thats why signs say "DANGER High VOLTAGE" not high current.

[@Shane-zh6tx]

XxMine231xX yes, but 1. The resistance of his tongue is low 2. Current will take any and all paths between two potentials (both terminals are in his mouth) 3. To me it looks like a parallel circuit: low resistive path through shunt, slightly higher resistive path through tongue That's why I'm confused

[@XxMine231xX]

Shane yeah current will mainly take path of least resistance and in this case it is a parallel circuit and the wire has less resistance thus meaning that he wont be electrocuted

[@XxMine231xX]

Forgot to add the wire is insulated so he may have not touched both probes

[@epiendless1128]

You're right in that it is a parallel circuit and our hero is simplifying: there is _negligible_ voltage across the 2 sides of his mount, leading to _negligible_ current through his tongue. There is _some_ current through his tongue, but it's tiny because the wire has far less resistance than his tongue, and most of the current goes through the lower resistance. I did wonder if the wires were going to come loose at that point and put the full PSU voltage across his tongue. *cringe*

[@Zizzily]

GIMMIE DA -SHUNT- MEETTA!

[@pokoknya]

hilarious education with hilarious result.. but I should thanked you because it's really deepen my knowledge about current, voltage and resistance..

[@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

[@superstars6175]

SHHHHUNT!!!

[@wavexphonk]

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

[@NA12495]

The reasoning at the end was the best part for me... Use with an o-scope. Thanka.

[@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. ^_^

[@luqcrusher]

No "Shunt" at 4:13

[@PizzaPowerXYZ]

I took a huge shunt and clogged the toilet

[@NSilver832]

I was watching the the video to start making my own "shunts". After he burnt his fingers I thought, "maybe I'm better off buying those shunts". Thank you anyway. Good video you got a new subscriber.

[@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.

[@sausagedog52]

GIMME DA MEETA OR DA SCOPE!!!

[@connivingkhajiit]

Thomas Sears furry nigga

[@sausagedog52]

Michael Remington k

[@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?

[@successfulengineer]

The biggest problem with Copper wire shunts is the temperature coefficient of Copper is very high, so the resistance changes a lot as the wire gets hotter. That's the magic of off-the-shelf shunts, you can fairly easily get them down to 50ppm per degree C, as a comparison, I think copper is around 3000ppm per degree C. This is also why it is not a good idea to use tracks on a PCB as a shunt. But, assuming you can keep the dissipation low enough, Copper shunts can definitely do the business.

[@Arhentir]

10:15 dat face :D

[@semy4544]

I slap my face everytime he say "shunt"

[@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 ^^

[@aadityaacharya5902]

It's amazing how mehdi answers my questions without me even asking 3:13