How Three Phase Electricity works – The basics explained

How Three Phase Electricity works – The basics explained


In this video we learn how three phase electricity works from the basics. The basics of Three phase electricity explained. We start with a simple single phase AC generator and then add in a second and third phase to under stand its working principle. We also cover three phase power uses and distribution as well as why we don’t use more phases.
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100 Comments on "How Three Phase Electricity works – The basics explained"


  1. IMPORTANT The magnetic field shown in the video is an overly simplified illustration to help visualise whats happening. This is not representative of the real world. If you need to dive deeper on how magnets and their fields work, please start with this wikipedia article: https://en.wikipedia.org/wiki/Magnetic_field
    IMPORTANT WHY DOES HE SAY "Free fasze" … because he has a regional British accent.

    Reply

  2. Most private homes (in Scandinavia I must add as I don't know rest of Europe) have 3-phase drawn into the building. We largely use 3-phase for stoves and other appliances giving us the ability to have high energy consumers with low amperage main fuses, typically 16 amps*3.

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  3. Can anyone explain to a moron (me) why an electric motor powered by AC decides to run in one direction rather than the other – or rather, doesn't try to turn in both directions alternately, changing its direction 50 or 60 or whatever times per second?

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  4. Bro bro bro that's it ya that's it . All my life teachers said about 3phase is 120° and bla bla but it never understand how 120,3phase mean n lots more. But here u comes. U know what YouTube was recommending this video from a long time but I always ignored it bcz I know noone can explain better but i finally decided to watch n I m amazed i mean love u bro u r awesome explainer u cleared my doubts which noone could this way.
    I liked n subscribed u bro🤩

    Reply

  5. "They are turning on and off so fast the human eye can't see it"
    Then i am not a human because i can definitely see it, i hate this generalization that humans can't see beyond 24, 30, 50, 60 Hz.

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  6. 3 phase motors are not faster. Single phase is the fastest. 3 phase gets more torque and is more efficient.

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  7. Good explain and presantation against university educators who just memorized and do not know how easily it works

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  8. I understand your explanation about using 3 phase generation to keep the AC power supply constant (as with your example of the light bulb in your video). However how does that explain residential lighting and equip such as tv’s, computers, etc. that are running off of single phase electric from a pole mounted 120/240 transformer? Is it because even with single phase power supply at 60 htz its still to fast for the eye to see?

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  9. That was so well explained. Just wish I found this sooner. Now that I'm subscribed things should be easier. Thanks very much!

    Reply

  10. A simple explanation that most everyone will understand. Where was this guy when I was learning about electricity in school? He explained it much more clearly in a couple of minutes than a bunch of long-winded lectures by "teachers" ever did.

    Reply

  11. Don't stop making this knowledgeable videos……..
    From now…. I'm Your hardcore fan….

    Reply

  12. I'm an engineer working in manufacturing and work with electrical contractors a lot. This greatly helped clear up some concepts for me! The Engineering Mindset channel is awesome! I'm watching your other videos kinda binge watching. Great job explaining things in layman's terms!

    Reply

  13. Thank you Paul! You make this complex and dangerous subject knowable and easier to grasp. Fantastic graphic animation; You are a teacher and instructor par excellante`

    Reply

  14. Electricity was never one of my strong suits, and the extent of my knowledge of it was how to screw in a lightbulb. LOL. But after this video I feel like I have learned something, and am grateful for you explaining it in terms that I can grasp. Thank you.

    Reply

  15. This is very intuitive. I never knew how an AC current is the way it is. I've read books and tried to researched, but got nothing. Congrats on making me understand the concepts of this whereas other sources could not.

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  16. seems its serving secondary purpose now days as no one uses 3 phase motors from it , just advantage is load distribution in house and if one phase is weak then it can b switched to normal one . in out house we have just selector for phases .

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  17. THANK YOU ! I get it now! so now i have a question… i have a wind generator that produces about 2.0 volts AC (yes two volts) and it is a 3 phase generator. so if combined that would give 6 volts correct? how could this be used to make 12 volts of DC current?

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  18. I have a wish-list:
    1. That you had a means, less cumbersome than comments; to quiz the students to see how well they've grasped things so far;
    2. that a multi-channel oscilloscope could be configured to show each phase in color;
    3, that you covered power factor before going on the 3-phase power.

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  19. I take it that 3 phase power is imposed on data centers to distribute the load in a building?

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  20. hello very much from Colombia I would like a video that explains that electrons are made inside a coil so that it produces magnetism as well as the example of the bulbs that the electrons collide against the atoms and heat the filament I would like an example in the coils as I said previously thank you so it would help me to better understand the electronic and also repecto that is the magnetism and what phenomena have related to the electronic thanks are very good giving us good examples

    Reply

  21. Great video, I would make one correction though. Most if not all houses in the US are wired with two phase. Most circuits only use a single phase, but for something heavy duty like an electric furnace, or electric cloths dryer, you would see a large plug and the appliance would be marked 220-240V

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  22. okay youtube… get out of my head!
    i kept forgetting to look this up and now its in my recommended…

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  23. Any chance I can just connect my brain to yours and get a whole data transfer sir? lol, I/we commoners appreciate you!

    Reply

  24. Dude thank you so much. We had electrical engineering subject for a year and I never understood how 3 phase appliances work. Now when I am starting my own factory after all these years, I had to understand 3 phase power to understand functioning of my powerful induction motors. You did a greatr job! Thank you so much man 🙏

    Reply

  25. Great video, though I do have a comment:

    It's stated that homes are usually supplied with 1-phase power, due to lower power needs.
    However, some places (like Northern Europe, where I live), homes are supplied with 3-phase power, even in a small flat. This is due to the fact that some home consumer, like stoves, require 3-phase power. So here power is supplied as 3-phase 400 V (previously 380 V) 50 hz., and different areas of the home is supplied by 1 of the 3 phases, whereas areas like the kitchen has an 3-phase 400 V outlet for the stove.
    I have also noticed that in areas like suburbs, local substations (transformers) supplies as many as 5 – 6 lines, each providing 3-phased 400 V 50 hz. , usually at up to 32 Amps per home.

    Reply

  26. When I was in college we didn't even have computers. Still on punch cards. You guys are lucky.

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  27. I'm blown away by the fact that someone gave this a thumbs down. The video was clear and well understood. The illustration was on point and very direct. What more can you ask for? Google should force people to leave a comment to say why this deserves a thumbs down.

    Reply

  28. Ok this was a good video. But i have some questions. If electrons are moving back and forth with each rotation of the magnet, then surely the electrons' net movement is zero? It looks like the same electrons are moving back and forth through the same bit of wire.. this obviously isn't what is happening, but could someone explain what is?
    Also, this is a minor point but wouldn't the direction of current change 100 times per second at 50 Hz? Not 50 times per second? Because within one cycle the direction of current changes twice.

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  29. Hey I have a question since lights are on single phase do the flicker more when it's a single phase generator or 3 phase and y ?

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  30. 👉How 3 Phase electricity works: https://youtu.be/4oRT7PoXSS0 AND 👉Three Phase Electricity: https://youtu.be/4oRT7PoXSS0 are the same

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  31. What… I had no idea this was a thing… now I'm going to keep my eye out for indicators… I'm guessing the big power lines are all in 3s and I just never thought about it… <excitement builds>

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  32. Hello sir, how to convert three phase generator into single phase generator…please help

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  33. One suggestion before I continue watching the video. You might want to remove the "jiggle" of the video title above the animation we are trying to concentrate on, it is a bit distracting. Thanks for sharing knowledge

    Reply

  34. 6:00 Don’t lamps nowadays use capacitors so they work with single face and never fluctuate light?

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  35. Ive searched for years to understsnd what three phase actually is and how it works. This, my good man, is the best explanation ive ever come across. Thank you so much.

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  36. Question… Does the voltage increase with the number of phases? Meaning, One phase = 120 v, Two phase = 240 v, Three phase = 360 v.
    Or does the voltage remain the same?

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  37. Premed physicis (among other courses) humbled me, and made me realize what an anencephalic monster I really AM!

    Reply

  38. I honestly went to school for Instrumentation and Process Control. If your videos were played in a classroom setting, the institution could have crammed three semesters into two. Excellent video!

    Reply

  39. Sometimes while I write something for a long time I begin to see how my lamp begins to flicker very fast, this makes me very nervous so I can’t continue my work

    Reply

  40. I certainly learned what normally takes a whole semester in a college, just by watching this video. No really, this video did an EXCELLENT job with the narrating in sync with the illustrations. GREAT GOD above THANK YOU for Youtube Channel and Youtube!!! 😀

    Reply

  41. What's really cool is a vfd on an electric motor. No more sine wave, it's converted to a digital signal

    Reply

  42. Откуда может быть синусойда, если ротор делает круг…? График неправильно показан….

    Reply

  43. Hi Engineering Mindset, apology if you included this in the video and I missed it – but did you cover "Why not more phases?" ? Also, I see there are 5 Phase motors out there – what do they do?

    Reply

  44. Holy crap these videos are outstanding! I finally get it AND I have a better appreciation for electricians (not that I didn't before).

    Reply

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