Transformers are Awesome! | Doc Physics

[@lordfarqward8227]

You're one of the few youtubers that don't make me fall asleep. Thank you! I learnt a lot:)

[@DrifterD]

You taught me about transformers so much better in less than 20 minutes than my lecturer who took 2 hours to teach this, without me understanding anything. *Thank youuuu*

[@KabooM1067]

That outro... omg XD. I wish a lot more teachers were this fun, it would be harder to NOT pay attention to them.

[@garthmartinsen9612]

Uh... but power is also equal to V*V/R. (Ohm’s Law). There is a good reason for having high voltage for long distance power distribution but I am not sure you have pointed out the correct reason. I did however, really enjoy your presentation.

[@aravindansundaram4010]

But you only use V2/R when there is uniform voltage throughout... I reckon the voltage between two transmitters are the same but the voltage between the power source and first transmitter is less than the voltage between power source and second transmitter.. So you use V2/R when voltage is same throughout as in a parallel connection in domestic circuits..

[@ECOMMUSK]

i am a senior electrical engineer with 11 units (3 classes) left to complete and this has been more educational than anything any professor has ever taught me

[@toddmolloy311]

Because we're taught to maintain the system we currently have not improve upon it..

[@8Steady]

I've watched many transformer vids, but this is the first one I found that answers that question... "who's buying?". Thank you (8 years later).

[@MikelHensley]

I'm taking courses in electronics and sought out some KZbin videos to break the monotony of reading. I greatly appreciate how you explain how Faraday's Law works with the transformers ... that was in my text but trying to read it just makes my head hurt. Your way of explaining helps a lot. Thanks!

[@DocSchuster]

Excellent question, dude! It's critical to note that when you use that equation for power lost in the line, V is the voltage DROP across the line. This is VERY often misunderstood. When you talk about a high-V line, you are referring to large V between the line and ground, but saying nothing about the voltage between one end and the other (hopefully the latter is small). You find V across the line by V = IR, so it is more direct to use P = I*I/R to find power loss on the line.

[@MachinistDom]

Normally I fall asleep listening to recorded lectures from my University. I think they should get Doc Schuster to do all of their lecture recordings.

[@ntonyproduction]

Even though english is only my second language, I was able to understand clearly what you said in this video and it really helped me out. Thank you for these informations!

[@souhardyahalder3903]

even though i am thousands miles away,my high school days were beautified by this person.

[@BrassicGamer]

Dude that was freakin' awesome. I was like "I did not come here for this!!!" but in a "I came for a bike and left with a Porsche" kinda way.

[@logchain70]

IVE NEVER BEEN SO JACKED UP FROM WATCHING A KZbin VIDEO ABOUT ELECTRICAL CRAP, THIS GUY SHOULD BE A PEP TALKER FOR MMA FIGHTERS WOOOOOOOOOOOOO

[@DocSchuster]

Sometimes I think about how tremendously that would change our lives. Imagine!!!

[@stolendata]

I love how all the maths, theory etc. lead up to simple yet very stern and decisive declaration that the power grid was never meant to heat up the countryside.

[@sonnykay3594]

Doc, one thing i have to say....... YOU ARE AWESOME ,,,,,Thank you again.

[@DocSchuster]

Oh, I understand your confusion. If I just hook up a battery to the primary coil of a transformer, that coil will experience a change in flux, right? The only problem is that the flux will approach a constant (saturated) value based on the steady-state current from the battery. That's why I mentioned a battery.

[@DocSchuster]

YES! The iron in the core is laminated sheets to prevent eddy currents, which would significantly heat the iron and lower transformer efficiency. You can also make cores out of nonconductive iron-ceramic suspensions for the same reason.

[@DocSchuster]

Boy, I'm sure not an expert here, but I'll shoot from the hip. Maintaining safety raises costs while lower current lowers costs. You've also got to have step-up and step-down transformers at each end. So there's a sweet spot that depends on length of run and power needed. Hiring an engineer to find that sweet spot is probably a good idea. Maybe someone who knows more firsthand about power distribution will comment...

[@DocSchuster]

A nice sound bite, but it masks some important physics: Sure, current is what harms tissue, but a higher voltage power line (which is not current-limited) will ALWAYS cause a higher current through your fleshy body (that has a fixed resistance) 'cuz V = IR. You need to be WAY more careful around high-voltage lines than low-V lines. It's the current through YOU that matters, and that's determined by YOUR resistance and the voltage across you (from the line to ground, typically). DANGER!

[@DocSchuster]

Not quite. Reread the previous post carefully, then continue: The current THROUGH the high-V line will be less than a low-V line that transfers the same power (because power transferred is IV). YOU DON'T CARE ABOUT THE CURRENT THROUGH THE LINE WHEN DECIDING WHETHER TO DIE OR NOT. The current through you is determined by I = V/R, where V is voltage between line and you (assuming you grabbed the dang wire) and R is YOUR resistance. However, Van De Graaffs are another story...

[@themandude20]

I love your electricity math and circuit videos, they are the best on the net. One thing to point out is, the power to feed homes in north america is 240v not 120v as most people think. It's a 3 wire system giving the option of 240v and 120v service to homes.

[@DocSchuster]

That's a super idea! I'm not sure where it would fit, but I do have so much more to say about electrical distribution. Thanks for the note, and thanks for watching.

[@sonilzaki]

The way you ended it was totally AWESOME!!

[@nimeshkrishnani]

doc (Y) you the man who treats the hear'er as a friend,the reason i watched and learnt,i did learn about transformers

[@DocSchuster]

Thank you! I'm glad the video was useful.

[@nimeshkrishnani]

it really was useful,you can say i managed to crack my exam the next day,due to the video XD

[@DocSchuster]

Ka-POW!

[@nimeshkrishnani]

ka POW XD thank ya so much monsieur i shall do the knowledge sharing too if i am ever that good

[@DocSchuster]

I'm sure you'll have something to share. Do it when the time is right.

[@DocSchuster]

I agree with you that cost and safety are factors, but you're confused about the voltage/current danger. Sure, current is what harms tissue, but a higher voltage power line (which is not current-limited) will ALWAYS cause a higher current through your fleshy body (that has a fixed resistance). You need to be WAY more careful around high-voltage lines than low-V lines. Again, that is exactly why they must be higher up and better protected from accidental bumping.

[@Ketchup__now]

Seriously, of all the videos that I've watched from you, this one was the funniest. Thanks always!!

[@ajcrowe]

Hey David! This came up on auto play after watching another video about transformers in a class I'm taking. And I said: "Hey I went to grade school with that guy!" Awesome indeed!

[@DocSchuster]

Ha! Autoplay is the refuge of the scoundrel youtube creator, you see. Although, any class with transformers in it is a great class.

[@ayushimahajan6931]

The most fun class ever! I could never get these transformer thingies and here I am.. almost in love with them

[@DocSchuster]

Think about which way the plates are oriented - that may help.

[@keithengineer4876]

Watching this video at my desk at Ameren. Didn't realize you were local. Wonderful videos. Its my last day here so you can tell my boss. I don't care.

[@DocSchuster]

+Keith Engineer HA!

[@JohnSmith-cy8hq]

08:02 I coughed up my chocolate milk.

[@anthonyvolkman2338]

Your mother and father live in a small house with one door and no windows. I love it!

[@wilmeriscool]

Thank you for your lessons here in the navy we're studying circuits and these videos are way more helpful than the classes.

[@DocSchuster]

I am honored to be able to help the good people who are risking their lives for my safety and security. THANK YOU!

[@DocSchuster]

A Van de Graaff generator actually DOES have a lethal voltage and cause a lethal current to go through you. However, the current only exists for an infinitesimal time. Not enough time, hopefully, for your heart to stop or your tissue to be damaged. Don't try to explain both effects in the same sentence, though. In much of physics, you need to understand what your limiting or controlled factor is. I've been hit by my 500kV Van de Graaff more times than I'd like to admit, but I'm still here.

[@DocSchuster]

I probably won't get them before you need them. What textbook are you using? Communications systems could be as large as a college degree!

[@benwilson224]

Omg 2:55 the transformer was so heavy he went autotune

[@arch_engineer8773]

Residential voltage is usually 120/240V. 120V line to neutral and 240V line to line, but I digress, you did an excellent job of explaining, and you kept it interesting.

[@spelunkerd]

When the secondary circuit is open, my understanding is that current through the primary is negligible, resulting in very little power loss. Why? Wouldn't this behave like a simple inductor, with current flowing through primary windings similar to what happens when the secondary circuit is connected? Is this because, with the secondary windings disconnected, there is much greater inductance of a system where the electrons on the secondary side have nowhere to flow to?

[@ldiazmdiaz]

One thing we also had to take into account was the transformer winding gauges (AWG) and resistance of each windings. We design these power supply (AC/DC) with an engineer and I was the Lab Technician.

[@aliciaflores5052]

Wow, a lot of enthusiasm, it made learning about transformers more fun and interesting. It was a little bit fast paced for me, but overall it was a great video!

[@أحمدالنقيب-ت3و]

I like the way you explain it , it shows how much you are fascinated by those lovely transformers

[@xAGirlWithNoName]

I wish my teacher was like you, I had so much fun watching this video... thank you so much!

[@mrmusicalinstrument]

If you work out, you win. If you pou, you pin. I can finally remember these formulas.

[@munumaconrat5886]

Thanks👨🏾‍⚖️ Mr Doc Schuster, I'm learning a lot from your KZbin Channel than I do in the classroom🙏🏾.

[@MECHEnglish]

I am a high school student for English and I am really thankful that was helpful .

[@DocSchuster]

Yay!

[@MECHEnglish]

I am Egyptian by the way :)

[@DocSchuster]

Nice! I have a wonderful Egyptian friend who brought us a meal when my baby was born - you eat VERY WELL! I'd love to visit someday. Thanks for watching.

[@MECHEnglish]

Doc Schuster it must have been Fata :D I hope you will someday . It's my honor .

[@DocSchuster]

Thank you, Esraa!

[@ghacrux]

I m turkish highschool student we learned about transformers in school but i have never seen transformer before ... that was fun and you are the funniest teacher EVER 😂 All i learn in school is N1/N2=V1/V2☹️

[@ernestwerbel6235]

Thank you for explaining this difficult subject making it easier to understand. Still learning!

[@ingenfestbrems]

Dude you’re taking this to personal 😁

[@thosehumans9329]

You explain things in a way that excites and makes me want to pay attention. Thank you

[@DocSchuster]

Oooh...making sparks, eh? I'll leave this great problem as an exercise but ask you two in return: How do you think these two things will affect your time constant: 1) larger capacitance, and 2) larger load resistance. Good luck, and be sure to not shock through your heart.

[@RoyalAnarchist]

You're pretty entertaining my dude. I appreciate these videos; they really help me review the concepts.

[@sienchok]

Way to go! The 18 minutes was over so much sooner than I expected.

[@mukeshpandya4171]

Wait, i just took the bait and the video ended with " No!" meh! Lovely video, Kids are so lucky to enjoy such educational videos FREE of cost. Felt I used 18 minutes of my time on youtube watching something worthwhile of what i learnt in my past life... enjoyed it!

[@hakimnoori627]

i come from Afghanistan. thank you very much. I undrestod more than i did in the class.

[@hydorah]

Would be good if you could explain more about what delta phi is and how it is calculated and such like. Would be useful for someone like me who knows nothing about the mathematical side of understanding transformers!

[@apathy11303]

Transformers arent awesome!!! You are awesome because you have taught me what my professor couldn't. Thanks so much!!!!

[@davidstone2405]

You are the best. We need more people like you. Thank you so much.

[@brianjlayman]

Best voltage mic 🎤 drop I’ve ever seen .

[@abdelrahmanwagih873]

Thanks that really helped alot ! Although why do we always use voltages to express the ammount of current we are transferring ? Why do we always say 120 volts instead of saying their equivalent in Ampere as current intensity .. is there a reason for that ?

[@DocSchuster]

Have you studied differential equations?

[@DocSchuster]

Many schools at age 14 or 16. But my treatment is at a first-year undergraduate level here.

[@salonisingla1665]

Thank you so much for clearing up the big voltag-small current mess doc!!

[@kornbread5359]

if the coils around transformer touch doesnt that mean instead of going around the loop itll just take a shortcut?

[@mrorganic13]

Me sitting on my front porch at 5 am to the brisk morning breeze answering the last question. “YES!” Boy was I disappointed .

[@DocSchuster]

It certainly couldn't. When did I say that? Seems like I'll have to edit a bit.

[@power-max]

Old vintage flyback transformers from CRTs are really great real-world examples of the diagram at about 6:25 for demonstrational purposes, I plan to use mine when I get around to teaching electronics merit badge for boy scouts.

[@DocSchuster]

Power Max Excellent. I have pulled many of them - they were just waiting for an application.

[@power-max]

Doc Schuster Same, although I had to buy mine on eBay since we generally have no junk around where we live. I am thinking of using it to either make a small tesla coil (useful for demonstration of voltage @ RF frequencies) or a lifter and other ion-wind propulsion systems.

[@Kravch96]

I appreciate your feedback, Doc! :) I suppose, just suppose, that both larger capacitance and larger resistance will increase the time of discharge, due to the capacitor discharge formula V=Vo*e^(-t/RC). But I am not sure about the magnetic stuff. Again, Thank you very much for feedback!

[@LinusN1887]

You're awesome bro. Btw, you should watch your videos in 1.5 speed. I feel like I'm in a vortex of knowledge when I do.

[@DocSchuster]

Linus Nandati Thanks! That's really a fun idea, too. A vortex of knowledge!

[@anchanamohan139]

why do we always take the losses to be I^2R WHEN V^2/R is also an expression for power. and here if V increases the power dissipation also increases

[@DocSchuster]

Precisely because this is complicated, and you must pay careful attention to what V means. Is it a drop to ground, or a drop across the length of the wire?

[@prabhakaranloganathan7329]

sensor

[@rohitsrinivas5824]

I think that's becoz H is proportional to I^2 and not V^2

[@theengineeringhobbyist7109]

Your enthusiasm is awesome! Some critical feedback is that you don't go through an explanation of where the initial equations come from just some algebra on equations you just randomly pulled out of seemingly nowhere.

[@MysticGuru]

can u please explain me about sinusoidal eqation

[@mandisa7356]

you really went and drew F O R T Y loops lmao you're brilliant

[@aefieefnvhas]

Absolutely love your videos, Doc! Legit your number 1 fan sitting right here.

[@chadgutierrez_music]

Thanks for making it simpler! Also, I love the distribution line drawings hahaha

[@anderskjeldsmarklarsen4020]

Question: as I understand ohms law says that if voltage goes up current goes up and vice versa, if resistance stays the same. So I guess you can't just decide if you want high or low voltage/current? So the resistance/wire is not the same on the secondary and primary right?

[@DocSchuster]

Excellent question. This distinction is subtle, and a common cause of confusion. Please check out my videos on power distribution. I hope they will help clarify. Thanks for watching.

[@taylorwhisnsnt5526]

lol that ending though

[@jamiehardie3609]

man I find u fun it I had teachers like u wen I was at school I may have be top of the class

[@daveh9474]

how many windings on the primary would you need to have enough resistance to not blow a typical..120v - 15amp...80%.. 120v-12amp breaker?

[@DocSchuster]

That depends heavily on what gauge wire is used. And remember, it's not just the DC resistance, but also the inductive reactance that decreases the current. I imagine that the reactance goes down when the secondary is shorted, which is how you might still blow the breaker under load. What a wonderful question.

[@christianparks3370]

so are you saying that electrical distribution systems are using higher voltage on power lines and less current, which causes more heat which causes electricity bills to be higher? when they could have higher current and lower voltage, which would cause less heat, which would be a lower electricity bill? thanks for the video....I am an electrician apprentice just learning some extra stuff.

[@watubelukinat]

some adapters use switching circuits - so the time ! power is gated ? ( whether a ups / uninterrupted power supply , or laptop charger ) sets the final output voltages .

[@WanSyazlina]

so if it was connected to a DC circuit, then there would be no Voltage then?

[@guruji243]

Hi Doc thanks for the info. I tried to wind a trafo for a small inverter.It gave me high voltage on sec but could not drive a small motor even through a regulator.

[@NNN-kkky]

I see the iron ring on your hand. Can't wait to get mine. though you should wear in your pinky finger

[@MegaGasek]

Your videos are incredible. You gained one more subscriber. I am trying to learn more about transformers because I am moving to a country where they've got only 220v... All my current (pun?) devices are 110V North American, some are bivolt. Kitchen appliances are 110V and I am taking them with me. I took a look at transformers online. I don't trust any of them. I did my research and the one I found of a maybe, possibly, acceptable quality is the Kriegers... I have learned that heavy in weight, power supplies make for better, quality products. Somebody stated that the Kriegers are heavy... Anyway, my question is: If I have a device that is 300 watts, I am going to double or triple that amount in my transformer... I will get a transformer rated for 900 watts for example (not planning on powering hair dryers, microwave oven, etc). I know they are rated at that but don't really output that much because of heat, etc... HERE IS THE QUESTION (finally) Due to the transformer being a ''simple'' device, will the components, ie cheap brand, expensive brand make a real difference?

[@saanikagupta1508]

Thank you Doc Schuster so much!!! Your way of teaching is really good!! It helped me a lot. pls make a video for rectifier, transistor and amplifier. :)

[@AbuSaud.Christos]

but why does the current drops on the other sider of the transformer if the voltage goes up ? shouldn't it increase ?

[@HeedyeKoren]

Dude you're the funniest and a it's pure pleasure to hear ya

[@harshasingh4889]

um one doubt, wont there be any back emf ( or the "bad" emf) generated in the coil, casue the input voltage is always changing with time?

[@daytonbaker5686]

I'm just getting into electronics and trying to learn as much as possible after learning about Nikola Tesla. I have some ideas, but don't know enough to apply them yet. If you use an a stable or flip flop circuit to supply the transformer would that work to create a stable voltage increase with the transformer?

[@THE______TRUTH]

Man that was a awesome explanation your ability to keep my attention is unbelievable. Thumbs up!

[@DocSchuster]

Yeah, I think I've got that at 10:07. No?

[@jimhinkle7245]

LOL!!! Subscribed. Well done my friend, well done.

[@DocSchuster]

Jim Hinkle Happy to have you!

[@DEN1960STE]

Great thanks. What about the diodes? Do transformers emit heat because the coils impede the current flow? If so input power must be greater than output power.

[@cherryxx6070]

You go Doc! HAHAHAAH best lesson ever! I wish you were my teacher at school ^_^

[@HazeAnderson]

Dat ending tho 😂😂😂

[@remllof]

this guy is amazing, i want to like this video about 100 more times, wow

[@delhoncho8811]

Excellent lesson and also statement to the money grabbing energy companies charging exorbitant amounts for what could be almost free energy.

[@sanaverma8282]

My textbook says that these formulas are only valid under the condition that the primary and secondary currents are very small but doesn't offer an explanation for this. Why is this necessary?

[@dannydsc7]

Really appreciate the enthusiasm. You're awesome.

[@ratchetbandits8218]

you were doing so well ohm's laws states the inverse relationship of IRE based on that you can supply a house with lots of current. Using a step down transformer to a respectable 120v and lots of ampers thus running all your appliances on a parallel circuit aka circuit breaker ohm's law also states parallel circuits volts stay the same so your current is divided that's why each breaker has a different values and your kitchen has more current than your bathroom

[@thg_2728]

This video is amazing, I think I'm gonna watch more of these coz it answers basic questions and puts it into context. AND you make it very interesting lol