Understanding Electromagnetic Radiation! | ICT #5 

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Can't say I've fully grasped it, but glad this video exists.

I am a telecom engineer and this is the most clear and understadable explanation I have seen. Great. Congratulations.

After watching this the bajillionth time, and 3 years of physics, i’m really starting to grasp this! Thank you for this visual! I don’t know why none of my textbooks ever even discuss kinks and what they would look like!

I am an ex electronics design engineer and this is the most brilliantly clear, non mathematical, non quantum yet lucid explanation I have had the privilege to watch. Congratulations.

This has to be the best explanation I've seen of wave propagation! I actually understood the mechanism by which the propagation of the wave occurs. Well done!

I have an Engr Degree & Master Electrician - this video covered 2 Electrical Engr classes rather quickly! Good luck.

I must say, this brought a smile on my face to see how beautifully you have explained this stuff. Teaching and learning this stuff has always been a challenge for engineers.

Hertz was a freakin' genius. He died at age 36, likely from a brain tumor brought on by his experiments....who knows what he would have discovered if he had lived longer

i always knew that electromagnetic waves were kinky.

you've taught me what my undergrad microwave course failed to teach. thank you! back then, my teacher and fellow students just cared about maths behind these amazing insights. all they cared about exams. i feel sad that this video was not released back then( around 2 years back) . math always gets interesting in engineering when you actually get to know what actually you are calculating. engineering is a beautiful thing to learn and to practice, but, one or two careless teachers- it can sure be hell.

Just a few notes :) Hertz's experiment: It wasn't the spark that transmitted the wave. The spark merely triggers the dipole oscillation. He used a massive DC voltage surge released into an oscillator (or without it) and then to a tuned dipole arrangement with a spark gap. The spark fluctuates, behaving also kind of like AC, that's why it worked even without the oscillator. The dipole then produces a dying wave, not a continuous wave. The wave is emitted by the whole dipole, not by the spark in the middle of it. Herz created the first dipole arrangement by pulling a capacitor electrodes far apart (the balls). The emitted wave was received on a loop that really was another LC resonator (L was represented by the loop or square of certain diameter and C was represented by the gap). 6:50 if the impedance of the power source/cables doesn't match the dipole input impedance, the power is reflected right on the transition point between them. This looks like it is reflected on the dipole itself. I really liked the portion of the video, where you explain how the EM field leaves the conductor.

I design mobile cellular antennas as part of my job. I thought the video was a great depiction, showing the propagating mode(s) as a kink, but I should clarify that antenna designers for cell phones don’t use halfwave dipoles. Rather, we use a random geometry of antenna traces to transfer energy from the board to near fields and hope that in the mess of fields surrounding the cellphone, some form of propagating modes also arise. A little shared secret among antenna engineers is that we don’t have a clue how our antenna actually work as it’s impossible to decompose fields into their constituent components using full wave simulators. We can only look at the aggregate fields. With a dipole, it’s easy to analyze and the modes pop out of the math.

I am stunned at how much I learned in under eight minutes; this pretty much neatly sums up both an intricate and cursory look over all of Uni's second year physics.

Nice video. Note that the electromagnetic wave does not move in a sinusoidal 2D wave, but in a circular 3D motion that translates into 2D waves when we detect them because we are only measuring on point in space.

I would say the greatest acceleration was regarding my lack of understanding of the information presented in this video. I was good for like the first minute or two. By the end I was approaching the speed of light of misunderstanding. My mass also increased, of course, to the understanding that 11 locomotives have.

how can something so informative be so underrated

This level of explanation isn't easy to find. I've wondered about this for years and finally decided to find a real explanation. It took over 2 hours of wading through irrelevant, simple stuff to find this. The idea that accelerating charges create kinks in their fields that propagate out at the speed of light was a real light bulb moment for me. Thank you.

The impedance matching mentioned is only correct for purely resistive loads without an imaginary component (provided by reactive components such as capacitors and inductors). Maximum transference of power is achieved when the load impedance is the conjugate(Z*) of the source impedance(Z).

It's incredible. Time and time again I came to this video from various sources and always watch it from the beginning to the end, regardless of the fact I already understand what it conveys. This is such a fundamental and well explained video it should be a mandatory part of any course on electromagnetism.

This is why I'm a mechanical engineer.

I am a telecom engineer and i think this covers alot of important topics though brief! Very resourceful. And damn someone studies this in highschool! Wow

I agree with @DF "This has to be the best explanation I've seen of wave propagation! I actually understood the mechanism by which the propagation of the wave occurs. Well done!"

I'm more confused than I was before watching this video, lol, when trying to grasp/match this with quantum mechanics my brain melts, but for some weird reason, I like it... Honestly, I think the only good way to try to understand this is doing the math, trying to formulate this through regular language is probably not only difficult but also not ideal.

I'm just trying to learn about electromagnetic radiation for an earth science class, this really is an endless rabbithole!

Please make a video on *How to understand this video* _😂😂😂Just joking_

Heinrich Hertz: "I managed to generate an arc across electrodes. It glows in nice colors, but it also hertz."

I have never seen a video as short as this yet explained so many things in great informative details. I've saved it to my "personal development" playlist.

Your explanation was exceptional and very clear. You chose great words to describe the concept in a simple manner, making it easy to understand. The animation in the video was amazing, and it really helped to bring the concept to life. It's evident that you put a lot of effort into creating this content, and the quality of your work is truly impressive. Keep up the great work, and I have no doubt that you will continue to flourish and produce even more outstanding content in the future.

I am in class 12 but I was also able to understand it ..thanks for this superb explanation ❤️

I loved this lesson. Thank you so much for sharing!

I'll probably have to rewatch a few times to get this into my adhd brain. But I get a lot of this visually. Thanks.

Would have been nice to have this video back in high school physics.

Theres a kink between what I understood and this lesson

It was really deep and covered all the stuff that i read just a week before. Bless youtube algorithm

Electron is a sphérical stationnary wave fonction, use the wave model of Gabriel Lafreniere, it work good.

This is the best and clearest video I have seen explaining this concept so far. Well done!

Great thanks for revealing this mystery I nearly got mad trying understanding the cause of electro magnetic waves you get me the solid starting point

the most comprehensive video about em waves i have ever watched

One thing I never understood is, are these signals tubular? are they spherical? How are we able to receive signals from above and from below the antenna?

Electrons in the dipole antenna doesn't actually move along the wire as shown in the diagram since electrons move very slowly (few cm/s). What's really happening in the conductor is much more complicated as it's a superposition of all the electrical field produced by the accelerating electrons. It's not something that can be appreciated intuitively, however this animation provides a good enough explanation.

Maxwell's original equations were a set of 20 equations. Oliver Heaviside (brilliant, self taught) had the insight to unify and reduce to the four we know today.

The video clarifies my concept about the memory effect of kinks. Thanks for sharing a wonderful content ✨✨🍀✌

Thanks bro. Really our seniors of 18th and 19 th century are legends of the technology. I would like attend any of the one scientist's lecture atleast 15 mins.

This reminds me of those maths class moments of utter bemusememt I used to have at school!

Amazing video. Pretty dense portion of essential information thank you! I apologize,but four mathematical equations were derived by Heaviside.maxwell had around 20 equations,that does not diminish maxwells work ,but gives some credit to a person who made them “usable “

Excellent presentation. Easily and quickly understood. Thank you 😊

This was a very clear and thorough video which helped me greatly with a physics assignment. THANK YOU! + Keep up the good work.

Unreal amount of information here. RU-vid is better than college to be really honest with ya. In fact my professors put on a lot of youtube videos just like this one in class. Thank you!

Awesome explanation! I've been seeking for this my whole life!!

Awesome... my extremely well payed professors in Brazil could not earn so much, since this guy outgame them in every aspect of the teaching phenomena.

This is a godly explanation. Thank you very much for this video.

Perfect! Very informative, it helped me understand the underlying concepts behind the mathematical description presented in my lectures :)

I have a BSEE degree which included multiple high level calculus-based classes in electromagnetic fields. this video explained the concepts better than all of those classed combined! Bravo to the developers of this video! A few questions below. At 2:19 the kink is said to move or radiate outwards at the speed of light, seemingly implying that this was the EM wave. But then the kink is shown as occurring at 3:37. This is before the two charges (and the fields between them) later meet and the EM wave is transmitted . Is this the difference between a photon and a wave (a collection of photons)? Do both actually occur? In other words, at 2:19 when the kink is formed, does this produce a photon(s) reconciling the kink from a single charge later followed by the transmission of the whole wave occurring when multiple photons collide from the multiple charges meeting? What is the blob of objects at 1:39? I am assuming it is the "charge" mentioned just previously? If so, is the blue dot that emits from it at the speed of light (referred to as "the information") a photon? Where does the photon get the energy to emit outward at the speed of light? Is it from the energy that must have been present to cause the acceleration of the charge? Or does it not need energy to accelerate because it is massless? If it is massless, why is it depicted as having a negative charge at 1:46? Why does "the field near the charge" need to "communicate" the "information" to the "field further away" at all? this implies that the fields have some intelligence and use the "information" to adjust their fields to reconcile the delta. Would it be advisable to omit this in favor of the really insightful bit about the delta being reconciled to prevent a discontinuation (correct the disturbance) between the two fields? (a disturbance in the time/space continuum). Can we also think of this as an energy problem? Could we say (from Newton's second law) that the change in speed, or acceleration, requires a force, which increases the energy state of the moving charge? Could we further way that the photon is emitted to release energy and establish equilibrium (from a conservation of energy perspective)? If the entire universe consisted of a single positively charge particle, would that positive charge have an electric field?

Hello Learn engineering, I am a Electronics and Communications Engineering departmental student and this is the most clear and understandable explanation I have seen. This video is very fine. I pay salute to the teacher like you. Great. Congratulations.

This video really answers all of my questions about electromagnetic radiations. Thanks.

My brain can't take this waking up 3 am for work, now it's 6 am lol

There is a mistake in this video: magnetic loop antennas exist, and they have extensive use between amateur radio operators (magnetic loop antennas are a single turn coil, fed with an alternate signal, just as the dipole antenna). In this video, they present loops antenas as they were useless, which is not true at all.

This has to be one of the absolute simplest explanations of electromagnetic radiation I've seen. Thanks.

That was a cool way to demonstrate Electro Magnetic Radiation. Really awesome explanation. Thank you.

4:00 radiation 4:20 dipol antenna - transmitter 5:00 dipol antenna - reciever 5:27 Antenna design criterion - antenna length 5:40 Antenna design criterion - impedance matching 6:33 impadance matching in antenna 6:55 parabolic antenna - impadance of free space

Wish " they " would have had this when I went to electronics school. Very succinct.

I'm glad seeing such brilhant and beatiful presentation! Thank you!

The simpliest and most excellent teaching session ever.

The best explanation of how a EM wave is generated I ever saw 👏🏻 But the impedance matching bit needs some work as it never addressed the “why” it should match for best power transmission. That example of alternator, motor and bulb added no value IMO. However overall a brilliant video...thank you!

This is BRILLIANT

Nothing better than this is needed..what a visualization 👌

Outstanding video on Radiation.

Interesting this is a show about understanding electroradiation. If we knew about it,we would already be travelling at the speed of light. Like yah think

The animations are fantastic, the best I’ve ever seen. Please keep in mind that none of the original authorities postulated existence of electron particle. Only the electron wave. What is misconstrued as a particle is most likely a node or singularity. We cannot hope to advance understanding if we hold to this concept that everything is created from smaller & smaller particles, i.e. quanta. Example, the reason that electromagnetic waves and light both travel at the same speed is because light is an electromagnetic wave. There is no light particle. Light slows down when passing thru a prism because it’s an electromagnetic wave, not a stream of particles. There are no dualities in nature. Wave-particle duality concept is a misdirection. Perhaps deliberate.

Great, and best explanation. Thank you so much

Oh man! You are giving so much theories & discoveries in a single video

Just wow..i am soooo glad to u.dude i am so thankful i always wondered how this actually happens.and u shown me wow

A wise man once said “you don’t need to know how it works, just work it”

Very good explanations and a nice visualization. As an EE myself I really enjoyed the video.

This is one of the most useful physics video I’ve ever watched. Really great job

This explained everything better than any amateur radio licence manual ever could

That "kink" theory is what most people should be looking for.

This is the best video i have ever seen on working of Antenna. Thanku.

Very good explanation! Thank you!

I can't believe I found you just now, like literally seconds ago

This a lot of high level information. I think it was well done.

Wow! My impedance mismatch has been corrected by your audio visual signal. Thank you so much.

Very accurate explanations, thank you! 👍

I have no idea why this is in my recommendation, but it reminded me to check the phase doppler offset from Voyager 1.

About halfway into I started dreaming about neurolink , would be my only chance of understanding it.

Thank you. An excellent video. I have been wondering about this for quite a while.

wow..amazing animation. Very easy to understand. Thank you developers..💐💐🙏🙏

This animation with the moving charge reminded me of the Doppler effect

Oww maam your lesson is great and more understandable due 2 the awesome animation

Nice, amazing! Thank you for the electromagnetic field.

I wish I had this amazing videos in the 90's to better understand these concepts, but I hadn't so it was much difficult to abstract them on just pictures or maths

This video solves my several-years confusion.

its amazing Maxwell could learn this in his time!

Thank you for such a well made video explanation!🙂

Outstanding video! Thanks for the simulations. They are better to undestand principles about EM wave propagation.

Should come with a warning: "if you are not ALREADY an electrical engineer, none of this will make much sense to you."

“Let’s explore this logically.” Me: Sure. 🤨

Good start at illustrating electromagnetic radiation. However, the 4 equations we use today are Oliver Heaviside's reformulation of Maxwell's 20+ equations used to map Faraday's (and others) observations of electric and magnetic phenomenon. Heaviside's reformulation and other ideas made Maxwell's work usable for telecommunications.

This video is incredible. Thank you!