Electric generator (A.C. & D.C.) | Magnetic effects of current | Khan Academy

Let's learn how A.C. and D.C. generators (electric generators) work.
More free lessons & practice -www.khanacademy.org/science/i...
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Created by Mahesh Shenoy

[@KhanAcademyIndiaEnglish]

Flemmings right-hand rule confusion: There are two Flemmings hand rule. The left-hand rule and right-hand rule. The left-hand rule is used when an already current carrying wire in a magnetic field experiences a force. This is the case in motors. We pass current through the coil and the force due to field pushes and turns the coil. However in generators, we turn the coil and as a result, electric current is produced. To figure out the direction of this current, we use the right-hand rule. Hopefully, this clears the confusion of why we use left-hand rule for Motors and right-hand rule for generators.

[@n.akshara511]

Thank you! Always had a doubt in right and left hand rules

[@pandaquiz45]

Brand

[@aiswaryas1444]

Thank u sir

[@maryanrebello4300]

Thanks.

[@johanburger6109]

Hi Khan, why are two rings used on the ac setup and not one?

[@seokjinsjellyrolls4963]

when i tell you this man explained it better than the entire physics department at my high school, i mean it

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yep

[@leena_asad7663]

Ikkr😂😂😂

[@suneethachandrappa8008]

yeah it would be better if Namjoon explained us right!!

[@garbitachowdhury5148]

Well said ✨✨✨

[@jadedbut]

Fr

[@ken.h2409]

I dont usually comment but I cant just ignore how good and informative this video is

[@pulsar5934]

Ken.H ikr, it’s very clear

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[@anonymousharmony]

yes i too feel the same

[@m_aminoracousticmusic6312]

Same here :’) thanks to Khan Academy 💕

[@Mahesh_Shenoy]

Thanks!! I did spend quite a lot of time on it :)

[@guanghuima5873]

Random Indian guy online > All Physics teachers in school with tons of degrees

[@user-qd4lf7bd4k]

Watch Walter Lewin's lectures he will blow your mind

[@randomguy3390]

He's Bangladeshi

[@randomguy3390]

I mean the main owner of Khan Academy

[@ogeo.8966]

@@randomguy3390 oh, I guess people just assume he's from India. That's cool that he created this site. It's helped a lot of students since it started. It makes school seem useless

[@identicalt-rex120]

He is Indian

[@nabeel5991]

This video is so well explained that even a small kid could understand

[@kavitarana2757]

True

[@ketaki5666]

ikrr

[@mazinarshin1012]

Like me

[@ZAIRGAS_HAVEN]

6 years old can underatand just like me

[@Sciencedoneright]

Can we just appreciate how cleverly made these generators are

[@Zishan_alykhan]

Nbbb

[@pragathihn7109]

Yes, our elders were very clever....

[@tearman005]

NO

[@johnstrawb3521]

@Science done right Imagine being Faraday, pacing, staying up all night, scribbling notes on a pad kept on the night stand... 'almost got it, almost, it's right there!'

[@Arnab_Das_01]

i mean tesla made this

[@JaredOwen]

Great video!

[@karthikk1693]

Hi

[@mahib5942]

I see your videos often...They are also much wounderful.

[@sam_2102]

I see your videos.. And that's all are wonderful... Great explanation Sir.. 🤞🏻

[@aakash.s1595]

The lord himself!

[@arushsaha4546]

Saw your dc generator animation video and it was just amazing

[@myshkinurmom2]

I've spent the past 2 hours trying to fully understand alternating current and generators, and this video has finally shown me

[@kritikasinha5631]

Thank you so much khan academy ,for removing all the doubts of the students like us who face difficulty in understanding electric generator and motor. The animation were so perfect we didn't even get confused for were the current is flowing.....thank you once again khan academy

[@Art_works.]

Yah

[@emmawang2224]

I'm having a hard time paying attention in class recently, I got stressed when I couldn't figure out my homework questions. This video cleared up lot of my confusion. I feel more confident in understanding how generators work. Thank you Khan Academy, you've helped me with math and physics many times now.

[@leisurely7689]

Sometimes i learn more on KZbin than actual school

[@kumarrajnish-mj2rs]

In my case , it's always 😅

[@joelnada3483]

I have never felt this satisfied ...before ...Thanks to Khan academy for such a content filled video

[@nandanamenon1863]

I just love how you address and clarify every doubt that comes to our minds as we learn these concepts!

[@jcronin3155]

The detail covered in that must have been the best I've ever seen.

[@aarushiarya5282]

Thank you so very much Mahesh and your team. It was indeed an excellent explanation with loads of patience and intricate details where children and even adults might get confused.

[@thundergamer07]

This video taught me something my teacher couldn't teach me in 1 year. This video did it in less than 20 minutes. Bravo

[@sarahholland5980]

thank you!!! the animation is so helpful, trying to visualize this through 2D diagrams was so hard

[@nadie-qm8rq]

this video is so good, it explains things so well, I think I finally understood how electric generators works

[@RedDesertRoz]

This man is the best teacher I've ever heard. This was made so crystal clear, my 11yo son could understand it and use it for his science fair project. Thank you, sir.

[@graciesargood6368]

The dislikes are from teachers who couldnt do it better lmaooo

[@gerhardbritz1196]

Or from people who expected ACDC music lmao

[@himagiri1770]

🤣

[@AaABbB-sg5cr]

we dont deserve this dude, but he's here anyway. Thx man!

[@user-dl2mr4bw3t]

Hello!! This is an amazing video. Really helpful and comprehensive! I would like to ask you how do the rotating wires connect to the rings? Are there any smaller circuits inside the rings?

[@smrutigupta6267]

This is the only video through which I have now understood about the generator. Thank you!

[@deepsheth8005]

The best ever video with a fantastic explanation and awesome animation. keep it up😎👍🏻

[@KhanAcademyIndiaEnglish]

Hey, here's a dedicated CBSE course on our website where you can practice all the concepts related to this video and more. And oh, it's always free. www.khanacademy.org/science/in-in-class10th-physics/in-in-magnetic-effects-of-electric-current

[@subsolodub]

According to the video how could we identify positive (+) and(-) terminals. please tell me I'm confused like infinity

[@Mahesh_Shenoy]

Finally! It hit a million! A milestone

[@noabeti1]

Congrats man on such explanation! Better then all teachers who just use nonsense examples and overcomplicate. Thanks!

[@mrdfoutz]

VERY well done! I'm an old dude who continues to be interested in power generation and distribution, so am always looking at content on KZbin. Though I've known this principle for decades, I don't recall it ever being done so clearly. Of course, computers and software make this possible, but you have used them quite skillfully.

[@khushboogoyal1512]

It has cleared all our doubts . Great job👏👏👍

[@celajesjadekarylleo.4645]

I learned so much in such a short vid! Thank you so much!

[@loocaloocachimpanzee3830]

I'm honestly so thankful for this!! I couldn't understand the concept from other videos. Hats off to u guys!! Keep up the amazing work!

[@mithujannati2439]

i have been studying o level physics for a year and i was never able to truly grasp what was going on with the generators. but with this video when tomorrow's the o level physics CIE exam I have finally understood it. tysm khan academy

[@abhaylifter0095]

sir, the explanation and the way you have presented this tutorial are very good for students. learning by visualization is the best method of studies. Students should explain this concept to others which will definitely be useful.

[@priyajitdeb9265]

So well explained . All my confusion went right out the downward wire like electric current

[@Mohamed-C-mohamed]

This an awesome video that matches a practical lesson with in the class! This can be understood by the little ones, this academy deserves appreciation! You helped alot of people! In you tube, there are lessons that are more important than the class lessons!! Thank you!

[@smikle23]

BEST EXPLANATION EVER!!! I had so much trouble getting my head around the flow of d.c and a.c in the armature. Its do with a.c having slip rings and d.c have split rings. Now I get it, thanks

[@khushisomerhalder9193]

One of the best video..Thnx alot...your Tutorial is amazing..

[@salaheddin5504]

good job man it is really a very good job i have just understood how this system works i commend you

[@nakem8]

Well done! I was so ignorant as to the difference, and after watching your video now I'm clear. Thank you! God bless!

[@tanyapathak5690]

This video was really helpful! Khan Academy and Sir Mahesh always come to my rescue! They deserve everything in the world for making these videos

[@wilson-nm5ok]

This is one of the best explained tutorials I've ever come across 💯

[@anasimic807]

Beautifully explained :). Thank You.

[@amunavarsharief4450]

Very much needed video that none thought of explain more clearly like this chap... Appreciated

[@christinamorton2058]

I concur with all comments here. Best explanation I’ve heard so far. Thank you so much.

[@ananyapandey6133]

Exceptionally well Indeed sir it's a remarkable explanation Thanks

[@yusufnazari658]

thats ur dad harsh

[@elmichonegro2843]

This is the best video I've come across explaining generators.

[@gourangshinde1616]

Agree

[@J_Seneca]

Huge thanks to this video for helping me understand this. I watched a different video on the same topic and I kept getting confused. I think the visual drawing really helped, they are better than just reading a diagram. I love Khan Academy

[@jeanpaulkyokya2341]

I needed to vizualize the "How a generator works", and this video provides me with just that. Thank you for the time invested in making this video !

[@andyg.3509]

Best commutation explanation I've seen yet. Thanks for your hard work on this!

[@donovananani77]

This should be a world record explanation He is soo good

[@subbaraokancherla2902]

This video is far way better than classrooms. I could not understand it even after 3 classes but now everything is in my brain. Thank you, Khan Academy

[@geenadinandasiri2662]

Thank you ! The lesson generators was a very difficult one for me in physics. This video is a great help for me to understand the lesson very easily. From Sri Lanka

[@jemsncrystals]

*Wow! Even if nobody will believe, i have searched and searched this thing for a long time. Since my childhood, that how stuff works; ive never came across someone who can explain with such an ease that even a child gets it. Thank you so much. I searched any but all gave book terms and jargons. No one actually knew how the frequency is there in AC. I was hoping to get the answer someday.* U know the feeling that when you want to get the answer to your question for years!!! Literally goosebumps!!! Thanks 🙏 today i learned about frequency in electricity. I have one more question that bugs me. That how in computers the circuits automates things. Like i know that we program them chips and all. But still, who does the automation? Please point me to the right direction.

[@KhanAcademyIndiaEnglish]

Thanks for sharing, I am glad it helped. I remember seeing an old (and lengthy) video by Richard Feynman explaining how computers really work. Maybe that could help.

[@jemsncrystals]

Khan Academy India - English thanks much. I searched. And found this. kzbin.info/www/bejne/e3y6eHp6jcpog6M can you plz check if this was the video you were talking about?

[@KhanAcademyIndiaEnglish]

@@jemsncrystals Yup, that's the one, but I am not sure if that's what you are looking for.

[@jemsncrystals]

Khan Academy India - English thanks i watched it but it doesn't has what i was looking for. *Im not sure about one thing! Who controls these automations in chips? For ex: If i switch on a light bulb. I have to manually flick the switch ON to make it glow. But in computers i don't understand how they do it automatically? I want to understand how they do it. Is a something related to the chemicals used in chips or some thermo electarical thing which open and closes the circuit ay a desired temperature???* These two questions have bogged me for like ages. You solved one but this second question is driving me nuts. Plz if you can; I would really appreciate that.

[@KhanAcademyIndiaEnglish]

@@jemsncrystals What do you mean by "do" when you say "how they do it automatically"? Computers require manual input too! You need to turn them on/off, type and double click on stuff you want them to run, etc. I guess you want to know when a program is running, who is, and how is it running that? What exactly is a program, anyway? - These are deep and curious questions that are beyond my domain of expertise, but I can give it a shot. Instead of a switch connected to a bulb, imagining 100s of billions of interconnected switches. Imagine turning on/off a switch can cause other switches to turn on/off, which could cause still more switches to turn on/off. This 'domino effect' is what I like to think of what 'running' a program means. So when you turn on the computer, for example, you are manually triggering a few switches, and then the domino effect begins. When it's done, your computer boots up. But again, as I said, take this with a pinch of salt - not an expert here. Do ask more questions! This is interesting!

[@evanzhao1941]

Thank you for explaining so well! I finally understood how AC and DC generators work and their difference!

[@unique7eleven]

for the love of God give this man an award for such an easy to understand video. I have gone to 3 classes and couldn't grasp the principals of generators, I watch this video now everything makes sense, thank you so much.

[@ryanswami9967]

Use of simple terms really helped in better understanding of how the DC and AC generator works & The summarized piece of work was amazing Thank you

[@rajikannan4857]

How many of u here are watching this video the night before your physics exam??

[@aakarmathur5625]

Which software do you use brother? ..... I want to explain concepts like this to my students. Please reply ASAP as they have their board exam next month. Thank you!

[@mudassir7895]

Very broadly explained. I got full understanding from it. Thanks😇❤️

[@sugondhesenuts838]

I don't know if you will see this comment but I've seen many videos with exceptional animation skills and great explanation techniques but this is the only video that has made me understand the whole concept of the difference between ac and dc motor and how it all connects to the concept of the fleming's left hand and right hand rule. This is the video I needed, the one I was searching for, for many days. Thank you so much. I was mostly confused on why there was a gap in the split ring commutators and this video fulfilled that doubt (thanks to the pausing you did to show the current reversing direction)

[@jasonli9010]

helpful for science project

[@amjad217]

For the first time I understood what happens inside a turbine.

[@darshita1270]

very well explained!Thank you so much sir.

[@thaashalingeswaran5412]

I can't thank this man enough for helping me out. Just so you know, you've helped a student get through they're homework

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@khan academy please do start a series for engineering courses

[@saraperdomomartin9683]

YOU LITERALLY SAVED MY LIFE LIKE WOW SIMPLY WOW

[@codymitchellaudio]

This is hands down the best explanation of this concept. Thank you so much for the clear explanation and very detailed drawings.

[@aseerjawadchowdhury7760]

I swear whatever you have explained, the whole Electrical dept. needs more than a year.Hats off sir

[@lakshnyaadhikari6052]

This is hands down the best explanation along with animation for this topic. This chapter was really confusing for my understanding earlier but it is literally a piece of cake now.

[@phrodite3882]

That was really 👍good and a lot clearer than my teachers explanation. Thanks!

[@real_Shinchan0004]

Where r u from?

[@zenabsalim9597]

@@real_Shinchan0004 India lol

[@real_Shinchan0004]

@@zenabsalim9597 yes i m indian , jai hind

[@crystalee0710]

thank you so much for this informative video! I'm having a really hard time learning electromagnetism and I am lucky to discover this video.

[@gabbyissa9063]

Best explanation I have ever seen. Can this guy be my new teacher please? I had so much trouble with this concept until now. Thank you!!

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THIS VIDEO PROVES MY WHOLE SCHOOLING WAS A Lie 🤣🤣

[@joymokadi5765]

😂🤣😂🤣🤣

[@paridhisinghal4826]

Your animation make everything easy to understand

[@fuckuandmetogether]

the fact that there is a summary is the cherry on top, lovely! 🥰

[@vyga_b4234]

Helped me alot to understand the concept of AC and DC............never felt this much satisfied after watching a class.....

[@azmaraees8854]

I was confused but now after looking this I am happy that my confusion has gone

[@rojusltu2287]

2:06 from top to bottom spells FBI

[@briskcuit2477]

thats how my teacher says to remember it. Its like a gun for the FBI

[@thuytrinhnguyen8497]

I need this kind of lecture for all physics courses! So understandable!!

[@sanjogbehl9635]

This video clears each and every point to its depth , Thank you 👍

[@margarethpretty9609]

very helpful, thank you.

[@Eureka4511]

When I present during recitation my middle finger to my professor, he said it does not says to point the direction of current, but the direction to go out to the classroom. Why is that?

[@studentonyt2367]

THANK YOUU!! I spent many days looking for vids about ac & dc generators and this is the only one that made me understand the whole thing :)

[@nealkuo]

This is the best tutorial on AC generator I have seen so far.

[@malhaar5880]

Just for laughs: "the middle finger is pointing put of the screen"

[@MADMAXY]

induction was nikola tesla....

[@kimjiwon5484]

This is so good. Every other sources I have seen did not explained the details fully and it was so confusing.

[@allensolly9746]

Best video ever.. being a pg student.. still there are doubts regrding this in my mind.. evrythng is clear now.. thank you.. ❤️

[@carloscardeira340]

When i was a university student in 1980's without internet only with books / static images, to learn this things it was 100x more dificult to understand these basic concepts then it is today and for sure it took 100x more time than nowadays. Congratulations for the video.

[@minety_pie]

Good 👍 Btw Where You From ?

[@ronyoung7917]

I learned this theory 60 years ago; L.H. rule for motors, R.H. rule for generators. As I didn't go on to work in the field I didn't ever fully get to grips with it, and have puzzled with my memory of it over the years. As I see it now, even a D.C. generator generates in A.C., the commutator acting to correct the A.C. to D.C.! Beautifully explained, thank you.

[@instantaneouslife903]

amazing explanation ! I have watched more than 10 videos to clear my concept, found yours at the end, and my concept is clear now !

[@ketaki5666]

thank you so much khan academy, your videos are extremely helpful. I could understand this concept with absolute ease by watching this video

[@pavanthecool1667]

Thank you so much For giving this in a simple way

[@safetymanager5995]

Long Awaiting explanation....Anyone can understand very easily.....Excellent job...Keep it up

[@anjaligangotri4525]

thank you sir for the wonderful explanation. it was a very elaborate explanation so learnt a lot

[@danielonehi2818]

You solved my lifetime mystery. Thanks!

[@deniscortes9200]

MAN! THAT WAS VERY GOOD, THE BEST TUTORIAL ON HOW AC IS CREATED. THANKS A LOT.

[@fudgalicious]

I have this A.C. and D.C. currents in my textbook. But I didn't understand the explanation it gave me. I don't usually like continuing with the lesson with doubts. I am so glad I found this video! The explanation is so easy to understand. I always wondered how turning a turbine could generate electricity. My textbook does not tell me, but this video did! Thank you so much!

[@newrevolution8481]

Wish every teacher taught like this. HE first explains the uses of the electric genrator on real world and explains it's working. Best

[@sussy8835]

Bro used the right hand at 03:04 mannnnn idk if it's helpful

[@cescamanning5859]

thank you this finally made me understand how generators work and i have my physics exam tomorrow - actual lifesaver !🙏🙏