What is RMS value? (& why should we care?) | Alternating currents | Physics | Khan Academy
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- Опубліковано 28 лип 2024
- RMS or root mean square current/voltage of the alternating current/voltage represents the d.c. current/voltage that dissipates the same amount of power as the average power dissipated by the alternating current/voltage.
For sinusoidal oscillations, RMS value equals peak value divided by the square root of 2.
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Created by Mahesh Shenoy
The teaching skill he has is insane
..... Understood clearly
Many of them have knowledge but how beautifully you have served it is rare....Seeing things out of the box and showing different perspective of what exactly happening is a real achievement of gaining knowledge and I felt that today....Thanx....Please keep making videos world need such kind of teachers...I have never ever commented but today was unable to resist myself after seeing few of your videos, you have explained so nicely I am really thankful to u.....
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The kind of explanation that puts smiles on students' faces. Thank you
Sir, you are THE BEST teacher ever. You have helped me a lot. Pls keeping making such videos. ❤️❤️
Damn right!
I have to yeach that stuff tomorow, and this made it SOOO much clearer and easy to explain!
wow,the quality of teaching is good !
I really felt joy while watching this video,thank you sir!
i often to say that who is watching and learnng the concept will be genious one day❤you had made science very intresting.... i didnot get tried in each minute..your 13 minute video is equal to alkah sir 1 hr video
The best and most effective explanation ever seen for anyone who is not interest into complex Maths rules to obtain an understanding. Well done
You explained where this RMS thing come from which is rare, so thank you 🎉
Super presentation sir
Thanks for giving a nice explanation for rms value
Sir you are just amazing!!!!!...I don't know how to thank you ...you are the best physics teacher I have ever met !!
Thanks for sharing. It’s the best explanation
Thank you so much! This helped a lot!
Waiting for this video eagerly sir.
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Best explanation on youtube, good sir. BIG LIKE!
I highly appreciate your teaching method and skills
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You clear concepts perfectly.
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Excellent video…. I was wondering who made this so well then realized it was khan academy… I should have guessed. Only Kahn academy makes videos this well
Truely Awesome Explanation. I got this by using mean value theorem for integrals.
brilliant explanation!!! thank you!!! top job!!!
This is so good !!!!
Thank you Sir
Physics wizard✨
I didn't get a chance to learn what rms really was except that it's relatated to some max value. Mahesh, you have a talent for explaining tough concepts in such a simple way. Another video of yours that come to mind is "Why resistors in series have different voltage (but same current)?" from FloatHeadPhysics. I struggle with learning about electricity but wow do I enjoy watching and rewatching your videos. Its so intuitive that I just want to share this knowledge with others. Thank you so much for your efforts, it has helped me greatly!
Best teacher till now in my life time ,i m big fan n student of yours
So clear!
Concept crystal 🔮 clear.
Thanks for the excellent lecture!
Such a determined teacher❤
Sir,now i got an idea what truely the RMS value was.thank you so much sir and keep making such videos .
Thank you so much for your very easy to understanding explanation.
thanks a lot..
After 35 yrs now I understand RMS thank you
seriously??
Please universe bless Khan academy's teachers with only good things
Thanku for give RMS of this knowledge
Love your video
Like seriously we have been thought something wrong , I have studied same thing and come to my 2nd year of engineering and now I realise the truth.
Thanks a lot sir!!!
You are an outstanding teacher! Thank you
Great job
Thank you sir 🙏
I Usually Never Comment....But..Man You Just Made That Way Too Interesting💀
Appreciate it :)
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great video
First view sir
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Awesome
Thanks
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Best explanation
too good
Wow, this guy is so good! I want more videos by him!
This is called real method how to teach physics its meant to be fun
You are God...😇
This man body is filled with electrical networks so that he know very well abt every topic related to electricalm. 😅❤
I
Sir, Your videos have helped me
Hats off to u sir
Plz use simple english help also other students as u teach very good
Link to the next video?
if we have a value maximum current, then what would be greater i(dc) or i(rms) ?
👌🏻👌
But not for every sinusoidal current right ? 11:06 I mean when phases are varying ?
❤
Sir why should we have to equalise power of DC bulb to that of AC bulb
Just like replacing 2 resistor in series with a equivalent resistor makes calculation easy. Similarly by replacing a AC voltage with the equivalent DC voltage(with RMS value) makes calculation of power dissipated easy.
Sir I have a question if we take two sin waves in same graph with x axis as radians, here one is sinx and other is sin(2x) . Then as they say the complete cycle takes only (2phi)radians. Then for sin(2x),it takes less than (2phi) to complete one cycle if we see in graph because more frequency ??
@@inbazhaganravikumar2293 no US uses 60 cycles per second, because they generate current at 60Hz
Yes less time to complete cycle hence higher frequency
@@inbazhaganravikumar2293 they use 110 Volts, 110 is not frequency
BUT then what is significance of average current ?
Fluctuation of bulb is 50 times or 100 times per second? 1 cycle is equal to 2 times fluctuations?.....watched ur previous video in which u described frequency and no. of times alternating current changes direction.
Current in a resistor is a start-stop motion of conduction band electrons due to their collision with the rocking lattice ions, and this causes a resistor with a sinusoidal voltage applied, to produce heat. The polarity reversals of an applied sinusoidal voltage (with the direction reversals of the applied electric field) do not affect electron collisions with the lattice ions. Electrons colliding with lattice ions from either direction will continue to produce heat and there is no cancellation of the heat developed!
Mathematically, the average value of a sinusoid is zero, and so, the average value of the current will also be zero. The average values cannot therefore represent the heat developed in a resistor with a sinusoidal current.
A resistor cannot develop heat due to a current in one half-cycle and then cool itself by a like amount of heat during the next half-cycle! It develops heat either way whether the current is positive or negative. The lattice ions vibrate from collisions irrespective of the directions in which the electrons collide with them. Therefore, since the average value is zero, it necessitates the use of the root-mean-square values of the voltage and current to compute the power, which is a statistical measure of the magnitude of a varying quantity and is the square root of the arithmetic mean of the square of the sinusoidal function.
Electrostatics and circuits belong to one science not two. To learn the operation of circuits it is instructive to understand Current, the conduction process, resistors and Voltage at the fundamental level as in the following two videos:
i. ua-cam.com/video/TTtt28b1dYo/v-deo.html and
ii. ua-cam.com/video/8BQM_xw2Rfo/v-deo.html
It is not possible in this post to discuss in more detail average and rms values.
The last frame References in video #1 lists textbook 4 which discusses in detail using a unified approach sinusoidal voltage, current, their average and root mean square values.
So what is the efficiency of this way of representation sir
the point of all this is to maximize understanding
@@sussykanyeballs176 I asked about the rms value sir .not about the wonderful way of teaching. that sentence i think is misleading
@@alberteinstien7016 oh OK lol
I watched twice and still didn't catch it. What is this N value that I am dividing by?
I think it's 220V r.m.s
Isn't the fluctuation happening 100 times per second?
I wish there was a way to like twice😅
Rms value in real life in our home, especially for eb bill
Are we dissipating more power and only giving less money because they only take the rms value
Nearly same bro but, they measure in terms of units(1 unit=1kWh-Kilo Watt Hour). So the meter might use rms value for calculation of power dissipation✌️
I hate when physics makes me smile
Damn got more. Confused wtf
Ac or dc bulb duh
🌃nightmare
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Physics wizard✨
❤