Started playing this video and my 22 yr old software engineering major daughter sticks her head in the room and says "Is that the new video? I watched it this morning." WHAT?!?!?!?! I asked her what got her into watching EEVBlog and she said said some video had been recommended and she just started liking how Dave teaches and especially how he draws things out (DaveCAD) so it's easy to visualize. LOVE THAT KID!!!!
I second that. I've been watching the channel for years but have been binging on the crazy Aussie bloke for the past few weeks. I've learned a quite a bit, and also some pretty funny sayings. Bobby-dazzler!
thank you so much sir. I rarely comment on your videos but now I'm getting college I will take electrical engineering and you always stimulate my mind. I love your videos and I almost watched everything. I've watched you since I'm 10 years old!!
In the 1980s, I wish I could have hopped in a time machine to travel to the future and watch Dave's EEVblog videos to learn electronics when I was a kid.
I fall short of words when I have to say thank you thanks for all your hardwork knowledge and all the incredible work and effort which goes into making these video . I respect you sir and wish for your long and healthy life .
to debate the naming defenition of AC, in dutch we have a name for everything: - DC - periodic DC - Constant DC And only when a wave crosses the x-axis ( = switch its current direction), it's AC. Then u have: - "Alternating current" (can just randomly switch current direction) - Periodic alternating current - And when avg=0 and its fully symmetrical, then its one word directly translated : "alternationcurrent"
Mmm AC.. I hope this carries on down the rabbit hole into pros and cons of HFAC vs HVDC at some point! As for ripple, good on ice-cream not great in a DC circuit :)
This is exactly what I needed. I'm currently studying electricity, and currently we're reading about AC, transformers and generators. You made it much easier to understand than the study material I have.
Thank you for reminding me how much I forgot! 😲🤣🤓 Thank you for all that you've shared over the years! Glad Sagan decided to get in on the fun and use maths to take the wind out of your sails! Lol 🤣
The new law says “e” (the induced stress of drivers on the motorway) = “B” (the flux density of Teslas on the motorway) x “L” (the length of the motorway) x “v” (the average velocity of all Teslas on the motorway) x “c” (the percentage of Teslas which have caught fire and become charcoal briquettes)!
As usual Dave really interesting and well explained video. A great reminder on a lot of the theory detail that I'd forgotten! I'd really like to see a similar video on three phase power, (edit - realized I did not word correctly!) What I meant was how single phase can get converted to three phase. and the equations behind it!
When calculating the RMS by integral of squares, the 1/T period should be cast away the root - I think... Thank you for GREAT tutorials. It's sad that university lectures aren't that at that high level so often. Your language is also easy to understand even for noobes ;) KEEP IT RECORDING...
Thanks for all of this Dave - I quoted you when I reviewed the Rigol 1074Z recently, only I spelled "come a guster" incorrectly. Until recently I'd been given to understand that inductors are *coils* but now (d'uh) ANY current through a wire is caused by a magnetic field (or is it the other way around or is it simultaneous) which why all components and even our PCB wires have a certain amount of inductance which can cause issues at very high frequencies! Damn my basic science and lumped component models. Back to skool (sic) I guess...
Thank you so much for this, been struggling to get into the nitty gritty of AC power. Messed around a lot in Desmos to understand the angles but with those extra equations, it clears a lot of questions up. Thank you again for this video!
what a great video! im just starting my career as an electrical engineer and this is really helping me fill the gaps in my education, thankyou so much!
Agggh! Did anyone else have an existential-rounding-error-crisis around 10:43? Well, it's close enough to pick up a thing and put the thing onto some other thing. (Show me again, those ∆v calculations, please.) "Correct within _some_ order of magnitude." was my fourth-favorite teacher's way of saying "wrong" while preserving face for his student while publicly deducting grade-points. *Edit* Good job youngin' on keeping the 'Old Man' straight. I should have watched it all through before running my trap.
Dave, this is awesome; while there are many educational videos on youtube, your take on each subject is important, as you are the standard reference around here; keep up the good work!
I remember years ago when you had Sagan sat on a table or something, you two were making some sort of Lego maybe? It was something like that. He was just a wee young kid. How time flies! I always knew you'd make an amazing parent, and the young man Sagan is growing up to be certainly suggests as such! The young chappy is going to go far :D
Another advantage to sin waves is you can combine any two at the same frequency, but any amplitude and phase, and you still get the same frequency out (just phase shifted).
Say what, you sure about that?? I for example they If they are in phase they have constructive interference - no phase shift but definitely has an amplitude shit.
Mmm, if you want constructive interference in a sinusoidal wave you need both in phase, so they add their amplitude. That's how you get 240VAC in USA, you use two 120VAC lines phased out 180 degrees
I think the maximum current peak should be at 0/180 degrees because then there is maximum change between S and N, not at 90 degrees as Dave said. But it's just detail, great work Dave :)
Dave is correct. at 0 and 180, the movement of the wire is horizontal and in line with the orientation of the magnetic flux. A current is only induced in the wire if the wire cuts through the magnetic field lines.
I agree with op, I thought voltage peak would be when the wire is horizontal, inline with the magnet but the current comes from the movement and would peak when the wire is vertical
9:27 I think a single cycle of AC can be described as an infinite series of AC waves that all sum to that single cycle, and those are all proper AC. So I'd say its still AC.
Fun fact. Edison hated AC but Westinghouse argued it was more useful as it could be "transformed" up or down to suit. This led to Edison describing those executed by Electric Chair as being "Westinghoused".
Team Sagan!!! We don't write a number for its beauty but because it's correct :).... just add a space and some other decimals and everyone will be happy :)
Ill save you all the discussion headache. As not an EE nor an expert, the simple way to explain DC vs AC is "does the current and voltage cross the X axis, indicating reversal of either". If the answer is no, then its a DC circuit regardless of any sine waves in it. Thats why an audio signal going into an amplifier circuit is getting rectified. What difference is there if you use 4 junction diodes to rectify or you overlay a large DC voltage on top? Both cause ripples or sine waves to stay on one side of the X axis. While you're hacking up a sine wave/AC input in diode rectifying to do work, you're adding work to an audio sine wave in an amp circuit so it doesnt have to be chopped up and that signal will then work on the circuit to cause voltage changes. Thats why I like to think of amp ciruits as cloning the input signal and not as passing it along. That also makes it easier to understand distortion. A flawed copy.
why Americans? rest of the world are mathematical geniuses?? on the side note, here is your Chinese RMB for doing your part in "murica bad" propaganda.
Metric is something we all use directly or indirectly. The indirect way is just more complicated. en.wikipedia.org/wiki/Pound_(mass) and en.wikipedia.org/wiki/Inch.
@@colejohnson66 Where did he say that? If he had said that how do YOU explain that the Ford Mustang uses mostly metric bolt and thread sizes. "Le Mustang"?
It's rather distracting how the confuser under the whiteboard keeps changing. I especially like the slide rule. AC is respective to a fixed voltage reference, thank you, the end. Doesn't matter if that reference is O VDC or 500 VDC. This is why, in choob amps, HF snubber capacitors can go to either circuit ground or HT and be equally effective, and why "lifting" the filament supply is an effective way of getting filament hum out of the audio signal.
Everything that effects AC also effects DC, and vice versa. Changes occurs always in nature, but you can choose to neglect them if the total impact is small.
@22:00 , So basically the average voltage means the negative peak and the positive peak canceling each other, like the old algebra rule (-120 + 120) = 0.
Nice to repeat some theory, though 2πf is a lowercase omega rather than w. Wondering if RMS shouldn't be in fact named SMR :) Integrals... ugh, I'm bad at math, okay? LOL. Suffice it to say that I failed my electronic engineering studies at the technical university because of calculus. Makes me wish that at least some teachers there were as passionate and humorous as you - it would be a pure pleasure to study! Lovely Casio VFD calculator too! These teeny weeny numbers are so damn cute. I was expecting an Electroboom meme at 26:35, haha :) and the cameo appearance of your son was real cute too! With an awesome dad like you, he'll be an electronic engineer in no time.
Another perfectly informative video, Dave. A great balance of information over time….hmm… I wonder if Education=Integral of information/time. Greetings to NW Sydney from locked-down SE Sydney
The Government is limiting how much alcohol can be delivered to a person in NSW. They are opening packages and removing or not delivering the contents. When are the people going to stand up against the lack of freedom?
Hi Dave, can you make a video explaining Monophasic home AC power, types of loads, phase shift, the power triangle, power factor, and how can it be corrected for homes?? I love your videos thoroughly explained , thanks 🙏
