These two videos together (AC + DC) taught me more about how motors work than several hours of university lectures. The information is very well presented.

These military guys make my day! Better than my Professor!

This video is proof that most of us and are children are being dumb downed by the public school system. When this video started I was like "what the hell is this old time sh*t". After watching it I have a full understanding of motors, generators, AC and DC current and feel like I can build my own generator to power my home. What makes a teacher good is their ability to make things easy to understand and this video did just that.Thanks for posting this !

these classic videos are so proper and simple to understand !!!! tells exactly what everyone needs to know !! old guys were best.wish if we are taught in this way !!

As an instructor of this subject I use this same method and material to teach my students, in most cases i tend to get the point across. I refuse to stand in front of them and try to show them how smart I am by expressing theories and complicated equations because when they are tasked to bring an operation back on line they will not have time to pencil whip the problem they need to know what it takes to get it running again. I love this and i cant believe people pay me to know this.

these old school videos are actually very good knowledge presented very well. Great vid!

These films have summarized my 400 page text book in a very pleasant way. Don't know if there are similar serious videos.Excellent work. Thanks so much!!

Old school explanation. The only way to go.

This is very good indeed. The balance between the theoretical aspects and practical aspects is very carefully thought out.

Why don't they make videos like this anymore?! Simple explanations of complicated systems in a clear, concise way. Invaluable.

Hands down better than any university lecture or my own college material, thank you to whoever posted this

It's about time I get an explanation I can understand. This is the best.

I'm a professor of physics and I wish I could explain as clearly and straightforwardly as these guys. Will take them as a model.

I like these documentaries and lecture videos, because back then I think people understood that to teach you need a practical balance of graphics and material. I found myself wanting to skip at the beginning, only to see later just about every slide and graphic has its purpose and it helps correlate the succeeding slides with precious material you learn. Outstanding job

This is probably the best explanation i have had so far

However, it is the sympliest and clearliest explanation I have ever heard :)

it's amazing how this knowledge has not changed in all these years. Medicine now vs then. huge difference, most instruction videos would be wrong. A lot of other examples too. But this stuff is the same throughout years.

I really do respect these old days.

This I have seen when I went to Electrician’s Mate A school in Great Lakes IL, in 1960...best type of training at that time and presently. Keep up the good work...best videos ever.

Sir, indeed very Good explanation and visualization. It helped me a lot.

Very good ! Thank you very much whoever posted this video! That was extremely educational for the roaring magnetic field motor I am currently building! Thank you!

Your example validates his statement perfectly. "I've seen loads of motors burned out because people don't understand how they work and why they fail" If the operator had a good understanding of how it works, then they could have operated it intelligently i.e. not burned the motor out. At not point did he say people how don't understand it aren't able to use it.

The best video out there for AC machines!

Excellent information. This is real knowledge right here.

i like these old and simply explained documentary movies.

this video is really informative.......i wld recommend it to all those who wld like to kno abt ac motors......

The best explanation I have ever hear n seen :) thank u

Awesome video.Old is gold.❤❤❤❤

1915, Tesla wrote in his autobiography that he "dreamed up" about induction motor in 1882, by chance 3 years before Ferraris experience. No evidence support this claim. It was evidently an attempt to ripp off Ferraris by showing that he pre-dated him. Ferraris was a gentleman, the true forgotten genius, who never wanted to patent his inventions since he thought that none should take advantage from science. Tesla took advantage of Ferraris's honesty....

thanks for uploading these videos ! :D

Felt like I was an extra in a Gomer Pyle episode while I was watching this!

This is gold

Muito bom o vídeo! Bom trabalho!

Very easy to understand, Beats textbooks!

An Old Black and White (but Excellent, Educational and Correct) Documentary Film:

thank you U.S. Army for this film!!

Thanks a lot ... so useful video.

amazingly explained..

I love this!

Nice information.

little did they know that 50 years later would they be helping me with my Physics homework :P

finally! THAT'S why DC is always positioned so far up on the Y axis in an oscilloscope....I always wondered the reason why, and teachers nor textbooks explained that to me..it's the combination of truncated ac amplitude levels :3

I had an exam on which half ot fhe topics were AC and DC motors. I understood nothing up untill the afternoon day before. Then I watched Part I and II, and the next day, I got a five. :D Kinda sas though, that I had no other choice, but to use material from 1961 (lack of university material)...

Thank you !

Wonderful indeed

Tesla was first grade Serbian-American genius who could speak ten languages and who had patented over 130 inventions including that of AC-generator, but died broken and lonely in a single room hotel in NY. Edison, who had invested heavily on DC-technique tried his best to discredit AC-generators and Tesla. Edison electrified at lest an elephant using AC in public to demonstrate how ”dangerous” AC was, but it was Tesla who won the contract for the world’s first AC generator in Niagara Fall, NY

The best explanation. Thumbs Up

beautiful presentation, wonderful. My question is why at the school of the metier he tells us the opposite of you .4 poles = 1200 rpm and in your video 4 pole = 600 rpm? 4 x600 / 120=20 herz Thank you in advance and congratulations for your video.

God bless America

Both live and neutral wires have the same potential difference between them. But only between them. One winding is grounded, so becomes neutral or the same potential as everything else except the other end of that winding which we keep separated to keep a potential difference or voltage between them which makes a current flow through our circuit. So there is actually 0V on both sides, but more between the two.

Because the rotor is already magnetized by passing direct current through coils wound around salient poles attached to the rotor. Therefore, no current needs to be induced from the rotating magnetic field of the stator. It is also why the synchronous motor will not change speed under varying load conditions up to 150% overload since "slip" is not needed for the motor to produce torque.

Keep in mind that it takes both conductors from the generator, connected to a load, to complete the circuit and produce current flow. In your home wiring, current will flow out of one conductor into the other through the load it's connected to. Current will change direction 60 time a second. The neutral is tied to earth ground in side your eletrical panel making it the same potentail as ground. This is only for safty and why it's color is white and refered to as neutral.

This is very good.

Thank you. Raphael Santore

before watching this I was Knewing Shit abt 'Em... thnxxx 22 whoever made it

You're right however, think of it like this... In AC there is no polarity as in DC! The only reason for the different color wires is that one wire (The nuetral) is tied to earth ground inside your panel. The nuetral will alway be at 0 volts when refrrenced to ground. But 120V or 240V between white and black or red, dpending on application. A person satnding on the ground, if touching nuetral, should be safe. Yes, your wiring leads to the gens through transformers which drops the voltage.

SO COOL

just done 4 years of schooling made more sense from this in half an hour

thats awesome

amazing

The earth and neutral are tied together for several reasons I won't go into. We know a circuit means a closed loop is formed, and the only way to close that circuit is to touch the other end also, which is the "live" wire.

It's perfect.

Wonderful

1:29 is great!!

Thanks

the graph that shows at minute 15:37 is of a capacitive load

nice video

I just want to say that nowadays and probably also when this video was shoot they use synchronous motor style structure as generators as well, in a way that the main current is produced in static armature and only small DC is applied to magnetize the rotor. Also, was 2/4* phase system really used as late as 1961? *4 if the two ground wires are not ground but minus potential compared to phase, they work just like American 120/240 split phase and produce 4 phases 90 degrees apart.

the neutral wire has no voltage meaning it's not pressurized. so regardless on how much the current is on the wire, there's no voltage, so no power, u wont feel anything.

Present day Croatia maybe, but back then it was the Austrian Empire. So going by where he was born you'd say he was Austrian. His family was Serbian though.

Movies like this are great. With all due respect to the viewers of the film who watched it in the 60's, it's just made for a complete idiot who has to start from scratch. A great way to start learning about electricity from scratch.

i dont know about that but im 100% sure he developed the one used in modern day and age and that saying something ;D

That's funny how it ended with "intelligent operation of such equipment," when was the last time you saw any one take into account how something works while they were using it? I've seen loads of motors burned out because people don't understand how they work and why they fail.

same here

my latter observation proves true!

nice

good

So a good AC traction motor would be a two phase synchronous motor.

The US military should update this videos

correct.

there is an error...in 100% inductive loads...the voltage leads the current by 90 °C

tesla was from croatia

Where can I find a Download link for this?

so basically if i want to build a simple four pole three phase generator i need to have 4 sets of 3 coils 120 degrees apart on 360 degree flat surface underneath 8 permanent magnets alternating in 360 degrees as N S N S N S

I like

@nmilance Nicola Tesla was american , he lived in the usa

The video actually ends at 19:43

@njdevil281 So what if he was one of the people that worked him that doesn't disprove him as the modern ac developer

Are Ac motors the same thing as AC generators, my professor mixes the term everytime he talks about it

@thescoob1111 So what? He gave up his European nationality and became a US citizen. His various inventions were done in USA and benefited USA. That is what is important.

that's true

Ποιο textbook χρησιμοποιείς;

Where can i find more videos like this? Anyone know? :)

@TheCerberusInferno Nikola Tesla was Serbian.

for the people who disliked this video ; WHAT YOU WANT ACTUALLY ?

2015 and we're still using these videos explaining things, made about 50 years ago... we're too busy making stupid videos that serve absolutely no purpose, then wonder why we have a bad economy and "no jobs"

Κυρίως chapman j. stephen, ηλεκτρικές μηχανές ac dc, ως βασικό συμπληρωματικό των βιβλίων της σχολής μου.

HELP HELP!I was watching hundreds of videos and i still don`t get it WHY NOTHING HAPPENS WHEN U TOUCH THE NEUTRAL TERMINAL. I mean....i see in the video how in a AC circuit the generator`s magnets are pushing the same amount of electrons forward and back but ,yet when u touch one side of the wire u get fried and when u touch the other one nothing happens. Why the electrons coming from "neutral" wire are not trying to get in earth using your body and frying. HWY WHYYYYYyyyyy....

Do we have alternators here?

AC MOTOr