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

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

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.

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!!!

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

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 RU-vid in my college days..

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 .

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

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

Beautifully explained, thank you!

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

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

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!

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.

Unbelievable Very interesting 👍 Thanks

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...

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

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

it was amazing. Thank you

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

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).

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

Very nice topic for basic Electrical engineering

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

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....

NOW I understand. Thank you very much. 👍

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

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.

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

Great presentation, thank you.

Best video on this topic uptill now 👍👍👍

Wow! 🤩 you smashed it👏🏻👏🏻👏🏻👏🏻

Brilliant explanation using the animation. Liked it!

thank you, very good explaination.

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.

Very clear man 👍

Thank You. 👍🏻

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).

Excellent Professor

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

Thank you I use in study in 12th-Sci

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.

Excellent explanation

Best job think you for this

Excellent..!

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

Very good, I wish you could cover more topics

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.

Super explaining. ..

Very useful

Awesome

This is gold

This is so interesting

New subscriber always watching your videos very interesting❤

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.

Superb Explanation

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

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.

man thank you so much

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

Good job

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.

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

Thanks

Thank you for information khalid du Maroc Casablanca

thanks

Great video. love the tiktok voice

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!

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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???

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

👍💙💙

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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

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

Thanks, never heard of this.

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

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

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

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

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?

what can i say, apart from 'Shocking' 🙂

Next - power calculation in three phase circuits

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

50 Hz in europe, 60 Hz in the US.

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

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.

Thank heavens for irrational numbers. In this case root 2.

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 .

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

Странно. Если сравнивать площадь полуволны и прямоугольника такой же ширины, там не корень из 2, а Пи делить на два.

But in the Europe we usually have 400 V (RMS). Peak value is approximately 566 V.

you said 325v on the last slide but the graph says 352.3v. Typo

Shanilka Ariyarathne

Isnt England 240v ?

This is the stuff that drives you insane. If you are an engineer or even a hobbyist you do need to know this stuff. AC circuits can be difficult. Where was You Tube in 1992?

You don't need to calculate that precisely. If the RMS is specified as 230V, then the voltage fluctuates in practice between 221 and 239V. 96% up to 104% of the target. The values ​​can worsted case be 90% up to 110% of the target, i. e. 207V up to 253V

240 uk

The ai-driven voice is rather bothersome. But, I need a refresher in this RMS thing really makes for a linear power supply that doesn't burn-out the transformer nearly as quick, and runs much cooler. This AI-powered voice is darn close, but its preponderance of clipped frictatives, grates my nerves. (as if I actually know what clipped fricatives, a bit of a mystery to me. So, THANK Professor MAD In 1984,pondering and cogitating my music and photography 'ny Mad because I am mad as hell and taking it anymore. Gello cuz I'm all wobbly implementing any sort of self-defense, so Ricardo MadGello. If there is an adjustable parameter controlled the the , not sur what its really called, but in the vicinity of consonantsbeing a bit sharp-edged, is more like it? Take Care and thanks again, Maestro. When I arrived at the Boolean Algebra in the Heathkit Digital Electronics course, I somehow managed to incorporate it in my debate tactics. Utilizing pure logic, instead of made-up woowoo science, works great when in the presence of law-school-ruined folks, where logic and proportion? they do not need LSD to toss those out the door, and these folks decided 190 degree scalding fluid caused 3rd-degree burns. That is charred flesh. out ;-)

So in summary, it is faster the old way, RMS = peak value x 0.707