Understanding RMS Values in AC Circuits √2 ? | Voltage | Current

[@dalesmith8666]

As an electrical engineer (myself retired), your explanation, with detail, is very well done ! Thumbs up. I've passed this along to others.

[@fasillimerick7394]

Hello there fellow EE! Some time ago in a music store I was with a friend and his girlfriend. She asked what RMS meant, and how it related to guitar amplifiers. I paused, and started running through my head how to explain it properly to a layman. She said "it's okay if you don't know". I really wish I had this video to help explain it at the time.

[@billcrowell5096]

This is the single best presentation on Ohm's Law, DC and AC circuits that I've EVER seen! I've been doing electronics since 1972.

[@saintsoomro]

❤

[@envitech02]

In 1988, right out of high school, I studied electronics engineering. I studied Ohm's Law, P=VI and RMS. But I never got around to why RMS is RMS. Now as a 50+ old geezer, I know. The animation at 4:05 is brilliant!!!

[@monteceitomoocher]

Something a visual representation makes a concept much more clear and understandable.

[@martinfarfsing5995]

I have college and university degrees in electronics and electrical engineering, oh how I wish your tutorial and internet site existed then , I'm looking thru your sites , thank you

[@d3vilman69]

Damn. That is one crystal-clear explanation of the RMS value. I know there is such a thing as RMS voltage in AC circuits but never could comprehend how it is derived. Hope I had KZbin in my college days..

[@davidjones6288]

This is the most beautiful delivery I've ever experienced, the clarity of speech, the pauses to let it all sink in. This is a treasure. Thank you Sir. An enormous amount of effort has been put into this, resulting in the bringing about of perfection. A truly brilliant job.

[@florentinosanchez3969]

Best explanations in the whole internet. Ive been days looking for explanations and there wasnt any video which make me understand. But this one is awesome. Thank you so much

[@Rosemarykimathi]

Simply amazing! Big Thank you! I was almost giving up on my EE1 and EE2 lectures. everything makes sense now!

[@Electric_Sherlock]

This is not how I learned it but exactly how I understood it to be. Far too often do we expect others to teach us and make us understand. Yes, there are some teachers that are better than others, but that doesn’t diminish the responsibility we have to ourselves for our own understanding of a topic

[@loren6609]

this is pure gold. one of the best videos ive seen. thank you very much

[@Profmad]

Wow, thank you!

[@tharangakpkk]

Best video as an electrical engineer i have ever seen explaining this...

[@eltranjbar6837]

Great explanation after years of being an engineer we are getting to understand voltage and current 😂😊 I always thank God that there are scientists who think and research to help us understand such things .

[@gunaratna123]

I had a blurred idea about RMS. It started with measuring UPS and SMP power supplies. Understood that cheap multimeters cannot measure the correct voltage etc. You cleared it. Thank you!

[@gregkocher5352]

It was decades ago, we went through the full derivation for RMS. About 15 years into my career I forgot how to derive it, but knew the sqrt of 2. Lol. This is a very nice review of the subject.

[@note9redmi17]

Good job. You managed to explain a not simple concept using concise and effective approach.

[@mohsenyousef4505]

If I’d have known this analogy during my study it would’ve saved lots of time and could pass the class with better grade

[@Tim-Kaa]

Beautifully explained, thank you!

[@BeautifulPlaces7290]

The best video with the best and simplest explanation I have ever seen

[@vincentpinto1127]

Fascinating! Wish I had learnt it like this in the early 80s!

[@adhamraad8619]

Unbelievable Very interesting 👍 Thanks

[@malikaamir6412]

Best video on this topic uptill now 👍👍👍

[@piotrgorynski1810]

Why youtube and guys like you didn’t exist in 1992? DZIĘKUJĘ 🎉❤😊

[@naharsingh7537]

Very nice topic for basic Electrical engineering

[@moazzamjadoon4436]

I have known about the RMS formula for at least 30 years. It's the first time that I know from where this equation comes.

[@esmeraldacastaneda5939]

Great explanation, thank you!

[@mp4338]

The peak voltage is usually used for capacitor. You must select capacitor voltage w/this voltage and no Vrms. In DC capacity the selected voltage must be function of the capacitor model. It is better 2 time more voltage than used dc voltage (specialy for tantalum).

[@Jo20020]

it was amazing. Thank you

[@mohamedkhalid7708]

Excellent explanation. Thanks

[@henryaganon514]

as a retired ECE this should be the way we teach this to kids.

[@johndevires5911]

NOW I understand. Thank you very much. 👍

[@uksachin8892]

Suprised To see a new way to derive The equation. initially I know a method to derive this equation using calculus but this method is more mind wobbling...

[@am9ac11]

As an electrical engineer myself, this method explains how ac power formulas started, but the calculus wad explains the understanding of what the words Root Mean Square mean. You can't average and sine wave centered on zero, so square it, now its all positive, now average it (mean), now reverse the squaring(root). And voila RMS and you get the same answer Vpeak / root 2.

[@hugovanderzee4944]

This is by far the most clear explanation I have seen. Well done! Minor detail, at 8:55 it says that Vpeak is 325.3. I suppose this needs to be 352.3 (as it states a few seconds later correctly).

[@eduaid777]

Thanks machn.. happy to see sri lankan channel in this topic

[@Esraa_MA]

Wow! 🤩 you smashed it👏🏻👏🏻👏🏻👏🏻

[@VivekMudgil-rf2co]

Excellent Professor

[@B00BS.]

Brilliant explanation using the animation. Liked it!

[@jensschroder8214]

The voltage changes in the US 60 times, in Europe 50 times. In Japan there are both networks, one 50Hz and one 60Hz, but only 100V RMS The voltage is 220V RMS in Russia, 230V RMS in continental Europe and 240V RMS in England. V peak is almost never used and V RMS is almost always used! V peak is only used when the AC voltage is rectified and the expected maximum DC voltage is asked. V RMS x SQR(2) = V peak V RMS x1,414 = V peak

[@ErwinAarnoudse]

Very well explained. Thank you very much for sharing this video 👍

[@mach1553]

RMS is the "square Root of the sum (Mean) of the Squares / 2" - By taking measurements of a sinewave evenly along both sides & peak, squaring each, add them together, then square root the sum which is the RMS voltage. The equation V=V/√2 is the simple method.

[@civildiscourse2000]

And that's why we use it - it's simple. It's only necessary to use a more sophisticated approach for non-sinusoidal waveforms, would you agree?

[@blaisekataliko7030]

thank you so much for your explanation, is wonderfull

[@amifamousyet1146]

This is gold

[@trangia12]

Great presentation, thank you.

[@mourchidMohammad]

Best job think you for this

[@straightstreet7143]

Very clear man 👍

[@mikeb4650]

Phenomenal introduction. Future videos on phase discrimination and power factors would be extremely beneficial. For myself I have never been successful with teaching 746 watts = 1HP, but a 110v rms, 1 hp motor takes 10.2amps average.

[@garbo8962]

Learned many years ago there are 4 looses in motors: stator, rotor, core & windage & friction. So the average AC t2 & 4 pole motors usually a 1 HP.Motor pulls 1,000 watts. Never trust HP rating on lying cheating communist china saws, drill presses etc. Way over rated.

[@tmatheson54]

Nice. Thanks. Having exposure to this many times during my 40 plus year career in engineering and as a hobby as a young teenager I found that for RMS when I really got to the Root of this I found that Squares can be really Mean! 😮. Sorry. Humor. I really did like the presentation.

[@ferhatnusreturuc1809]

thank you, very good explaination.

[@Yorumcu63]

Great video

[@Scorpster]

OMG, I've known about RMS for 45 years, but always thought household power was peak to peak. Even wired my own house from pole to multiple subpanels, how could I have missed that? Just one of the many new things I learned today....

[@wilcoxdaniel9825]

A negative voltage multiplied by a negative current gives always a positive power. Power then cannot be negative.

[@mathiazhagan92]

Super explaining. ..

[@GTLearningSolutions]

Superb Explanation

[@Profmad]

Thank you 🙂

[@nkvirk988]

Excellent explanation

[@eltek04]

Very useful

[@dajo4349]

Very good videos. I liked the voice, too. I liked the water analogies. I’m going to look at your other videos. Thanks

[@Profmad]

Awesome, thank you!

[@donepearce]

Thank you for using the term Average Power. So many people who should know better think that the product of RMS voltage and RMS current is RMS power. That irritates.

[@msg1956]

Excellent..!

[@cosmicazur]

Awesome

[@JoeMcLutz]

Thank You. 👍🏻

[@bretmutasa2676]

Very good, I wish you could cover more topics

[@sinaabdi2815]

Thank you very much. Im electric engineer but never understand these . Thank you

[@yasiral-shawi7521]

Good job

[@7trepwebstarfieldpaliar943]

If you were my electrical engineering professor, I surely will have the best grades❤

[@GamingMachine-r4c]

Thank you I use in study in 12th-Sci

[@smesui1799]

Superb, and clear. Seems perhaps AI ( Artificial Intelligence ) may have assisted in the production of this video, as evidenced by the voice of the presenter.

[@B00BS.]

So, if my RMS is 120V and the peak is 169.7V (as in 8:40) and I use a rectifier to convert it to DC, will I get somewhat 169.7V reading in a voltmeter at the end???

[@ricardo6988]

man thank you so much

[@OlaJendor]

This is so interesting

[@danburch9989]

The RMS value is .707 x peak value of a pure sine wave

[@civildiscourse2000]

Yes, 0.707 being an approximation of 1/(square root of 2).

[@mixme8655]

New subscriber always watching your videos very interesting❤

[@sagittariusa5642]

Next video ÷ how to transformer less(Capacitor) power supplies work. It Actually convert the voltage? And how about efficiency.

[@simontsegaygebre4196]

Wonderful presentation and animation! Keep it up However, here II do not see any mean square . Do it with the mean square. Using statistics formula.

[@kamalhamdi6739]

Thank you for information khalid du Maroc Casablanca

[@heronimousbrapson863]

The current changes direction 100 times a second (120 times in North America). It goes through 50 (60) complete cycles per second.

[@SachinPatel-pe6rv]

Great video. love the tiktok voice

[@merunaki2883]

THE GOAAAATTTT

[@aniiiiiiiiiiiiii]

What my professors with a phd could not explain was done here so brilliantly🫶🏻but here's another question, which parameter do the conventional Multimeters measure? If it's RMS (which really is), why? And if not, why?

[@TallLongGuy]

What service does the voice over. Everyone is using it.

[@civildiscourse2000]

I'd love to know as well. Unfortunately it's used for a lot of garbage, and this video is very much the opposite.

[@pibbles-a-plenty1105]

Yeah, so far, so good. But how does one come up with RMS voltage and current?

[@normstaley9799]

simply put - to find Vrms multiply peak voltage by the sin of 45 degrees, and divide Vrms by sin 45 to get peak Voltage

[@thomasmaughan4798]

It works but has nothing to do with sine per se; just that the sine of 45 degrees (in a 360 degree circle) just happens to be the square root of 2.

[@normstaley9799]

@@thomasmaughan4798 I didn't mean to imply that it did, just an easy way to remember the numbers

[@normstaley9799]

@@thomasmaughan4798 also the presence or absence of a "360 degree circle" has no bearing on the sin of any angle

[@thomasmaughan4798]

@@normstaley9799 "just an easy way to remember the numbers" That's good; whatever works! I have known this relation for decades but this video simplifies it considerably and removes trigonometric functions.

[@normstaley9799]

@@thomasmaughan4798 If you think all the algebraic steps this video goes through to get the answer is simpler than using the method I suggested then we should have a discussion on the meaning of the word SIMPLE

[@Shivani12326]

Nice Explanation I have a one question that why power is only in positive

[@rickb7933]

Power can also be zero but not negative. Think about it intuitively. How could there be negative power? Either work is being performed (positive) or it isn't (zero). The voltage and current being either positive or negative simply refers to the direction the current is flowing. Regardless of direction work is still being performed.

[@mohsenyousef4505]

So, the difference between either the V or I RMS and the effective peak voltage or current is basically the loss it happens during the power transmission!

[@milroykoelmeyer]

Sir l want to know what is differnes between RMS & PMPO and when the output power is given in PMPO IN amps how to calculet the RMS POWER OUT PUT OF THEAMP AWATING for teply pl pl

[@farhadghasemi3684]

thanks

[@abdelmalek9682]

Is this concept of average AC power applies to both 1 and 3 phases systèmes ?

[@mikeadler434]

👍👍

[@dashsidhartha]

In other words, RMS value is the DC equivalent voltage in order for the circuit to consume the same power if connected to a DC source. Am I correct?

[@joaochicora5080]

Muito bom

[@CommercialGasEngineerVideos]

Thanks, never heard of this.

[@Mesa_Mike]

We use 60 Hz in the USA and the direction of the current changes 120 times a second.

[@sollykhan2385]

what can i say, apart from 'Shocking' 🙂

[@UnitFerminBDauag]

⭐⭐⭐⭐

[@dalenassar9152]

Doesn't Root-Mean-Square (RMS) imply SQUARING a time-varying waveform, then taking the AVERAGE (MEAN) value of that, and finally taking the SQUARE root of all that? My guess is that dividing the peak by sqrt(2) only gives the RMS value of a SINE wave, but other waveforms need the whole RMS sequence. Isn't this what "TRUE RMS" DMM's do for 'any' waveform? THANKS MUCH!!!! --dalE

[@cacornett58]

I think that the Average value is actually .637 of the peak. Avg= P * .637. So 169v*.637= 108.12vac.

[@pradyumnanayak9844]

👍

[@mirskym]

Next - power calculation in three phase circuits

[@winniethepooh1931]

My multimeter measured household peek to be 120v. Are multimeters RMS?

[@KevinRudd-w8s]

Most of the cheaper multimeters give an approximate RMS value which is usually not that far off anyway. Multimeters are available that give a true rns value. It will probably tell you in the specs for your meter which one you have.

[@mohammadmajeed4853]

👍💙💙

[@RV35648]

Power will not be +ve , it also varies from +ve to - ve like voltage and current , but understand a -ve or +ve will not matter in an appliance all it is only dissipation .

[@jozsiolah1435]

RMS Titanic didn't have the electric lines on when the crew members escaped before sinking. About 10 󾓥 󾓦 󾓧 󾓨 󾓩 󾓪 󾓫 󾓬 󾓭 󾓮s escaped from the back part using a rope to a smaller ultra modern motor boat, designed today.

[@markmanning2921]

Isnt England 240v ?

[@okaro6595]

Britain has officially 230 but in practice 240 V they play tricks with the marginals. In 1980 the IEC decided to harmonize 220 V and 240 V to 230 V European countries switched to 230 V but Britain just said they did and used the marginal to cheat.