Electric Potential Energy

[ucingtigatiga]

i laughed because of the subtitle includes the cough of sal....hahaha

[Octdew]

Thanks! Your videos are the best! Very helpful.

[MindBehindPorcelain]

Well this is strange, admittedly, but I've grown to love your voice!

[thedrej]

this guys an idiot

[rebelgamer]

@thedrej explain yourself

[Stedginator]

On that last step, isn't 1/2 mv^2 a measurement of kinetic energy (which is measured in newtons?). If so, the final equation doesn't make sense since you placed joules (Nm) equal to a measurement of newtons?

[choulie93]

@Stedginator kinetic energy is measured in joules

[Stedginator]

@choulie93 oh of course! I completely forgot that it's kinetic ENERGY not kinetic FORCE. Haha, thanks!

[Bella0Heart]

You're amazing

[RayRayakaRachel]

ur a nerd

[pyromanizak]

@RayRayakaRachel ur a dren

[radioactivecakeX]

@RayRayakaRachel At least nerds know how to spell

[razzlefrog]

You make my life bearable.

[kourosh89]

I don't understand how an electrical field can be uniform. Wouldn't the influence on a certain charge die out after a certain distance from the source?

[sjsawyer]

@kourosh89 Realistically yes, but we're assuming the plane is infinite, and this is a relatively o.k. assumption to make when dealing with charged plates and small particles such as electrons. As long as the distance away from the plate is much less than the dimensions of the plate we can justify using this assumption that the E field is uniform.

[stonedkhan1]

thumbs up if your watching this video just a day before your exams.

[ian234234234]

i dont know i dont know, if you dont know dont teach.other than that nice job!

[Hohn89]

Wish I wasn't a poor, starving college student. I'd flow you a donation for bein' such a pro at physics and sharing the knowledge!

[AnnaJsonify]

more of this man to the people!!

[AnnaJsonify]

more of this man to the people!!

[MrDevin666]

Derek Vs Khan in physics, who is better?

[undertakeranshu]

@MrDevin666 both of them are best ones,,,ofcourse better than our teachers...

[jccjulio]

@MrDevin666 derek :)

[shrinivaspandurangi4]

fantastic, sir it was mind blowing. Thanks sir

[Aberdee805]

Thank you!!!!!!! 

[MrLegitFlip]

So for Electric potential energy, does Gravity still play a part in it or do we ignore it in the problems?

[pepsicokepepsi]

your videos are somewhat helpful, I find that you do take a lot of time explaining that something may be theoretical or you stray off topic when you should really focus on the big picture stuff. Really good stuff but verrrrrrrrry slowww. This is what i didn't like about my highschool teachers. Other than that great stuff and your videos are usually very helpful.

[TJwaffle911]

@pepsicokepepsi Some of us like it to go slow, because our professors went through it too quickly in class for us to understand. We aren't all natural-born electrical engineers.

[TheDipreta]

5 teachers saw this and were upset that they didn't teach it this well in class. Go Khan!

[thepowerofsin]

amazing!

[mgrenacs]

You are doing the same mistake in explaining the (gravitational) potential energy like many physics teachers : it's not the object that posseses the potential energy BUT the system {Earth-Object} in which object Earth and object m are in conservative interaction and may vary in relative distance... Otherwise how can it be understandable that a system of 2 electric charges possesses electric potential energy. Same question for a deformable spring...

[Nydox123]

@mgrenacs chill

[Nydox123]

@mgrenacs chillout

[IGNsucks]

Its videos like these which make you wonder what school is going to be like in 20 yrs.........at least for theory classes.

[MrYousafBajwa]

is there anything you DONT do?

[claymable]

i love this stuff.

[sgtpepperoni]

You are one smart dude

[flightsimulatorA340]

the work done by the electric field to bring two positive charged particles closer is positive or negative?and for the same case the work done by an external agent. and why?

[morbidlyobesesquirel]

this video saved my life- by saving my physics grade!

[akiladehan]

square root of 60 is 7. something something something... 8^2 is 56, how can 7.anything be more than that... =P anyways great video

[morbidlyobesesquirel]

@akiladehan 8^2 = 64

[akiladehan]

@morbidlyobesesquirel oh fail, i was having a brainfart that day....

[EXHellfire]

@akiladehan dude 8 x 8 is 64, not 56, 56 is 8 x 7

[lurion]

Excellent! I'm studying telecom engineering and I have an exam on electric fields and potentials soon. This video is an excellent "mind clearer" to allow you to get the basic concepts well in place. Thanks a lot!

[Shelobes]

5 people disliked because they didn't understood the explanation, even being explained for children! PS: I LOVE YOUR VIDEOS!

[JayDee98765]

@Shelobes So what if some people disliked it? It's there opinion, grow up.

[kpaniracrbk]

I agree with mandy....I really wish u were more clear..!!

[EXHellfire]

@kpaniracrbk he actually is clear enough =/

I learnt the whole introduction to physics year in the school, in 2 days with his videos...

[Iamatheist1234]

man you are AMAZING! BRO!!!

[mido4life]

thats very well explained. thank you.

[usman33333]

nice 1 khan!

love it

[mandy17g]

i wish u were a little more clear

[wizirbyman]

thank you so much! this is just soo good, im learning more from you than i did in a whole year in my AP physics class in high school.

[onenonlyqq]

Yet another Great video. Thank you

[suyogt1]

Interactable videO!

[ninjafretshadow]

KHAN!!!!!! KHAN!!!!!awsome vidios!

[terentulla]

thank u v v v v v v much.....

[Redbass100]

Your a lifesaver man, i have a terrible AP physics teacher and i would be so lost without these videos. Thanks!

[RockyBalboa211]

Mine gets lost in his own notes... overall the only thing keeping me alive is that he lets you use notes for tests.. lol..

[kevinbradenschmidt]

Great video man u've replaced me listening to my teacher in class all i do is watch ur vids before the test

[onlyAerik]

It'd be a more efficient use of your time to read the chapters you're supposed to be reading before the next class, and watching these videos at the same time. Then you can show you're teacher your learning and get his/her attention.

If you're in grade school, behavior counts towards your grade, even if teach says it doesn't.

[Tsardoz]

At the end when you assign a mass of 1kg and let it go you seem to be neglecting potential energy due to gravity.

[petervalender]

this was great. im a fan.

[burtonpatty]

if you think that's a penis, i feel bad for you. Quite an imagination though.

[luistr01]

te deberian de dar un premio nobel por la ayuda que le haces a la humanidad con tus videos!!!

[aroguegurklis]

Your videos are a fantastic supplement to lecture notes and the often cumbersome text books. Thanks from an aspiring electrical engineer.

[cjkuech]

@aroguegurklis ---I think you mean replacement to lecture notes

[Arieskrew]

this is good stuff.. but do you have a video on efficiency?????

[mansehrvi]

realyhelpful.

actualy iam from small province of p[akistanand your clear accent help[ me alot

[Weakboy100]

Very good video. Have not studied elctricity and the like much, so really helped me to get to grips with what electric potential is. Thanks

[tigernov6]

You always say see you soon, but I have never seen you.

I have always been wondering who you look like.

Can the viewers of your videos see a photo of you??

[HaroldStink]

Fantastic! Thank you for making this point clear to me.

[ringo692]

pretty good stuff was stuck on my physics 30 stuff and only 1 hour ago did i think i was helpless now im slowly making it through... how i have 85 in the class and not get this is a miracle to me

[cwar068]

Well if you are kind of person who will take time to think about the problem and work through it patiently then I'm not surprised:)

[719freethinks]

I thought that the work had the equal and opposite value to the Potential Energy. Can a person only determine the positive and negative of the potential energy based on the direction on the test charge?

[yoshi1379]

Yes you can. I think what your teacher or book meant was that the work done by GRAVITY is equal and opposite to the potential energy. If the test charge goes in the direction of the E field wants it to go, then the E field does positive work. But if the test charge moves in an opposing direction (like the example khan showed us), then the E field does negative work. Correct me if i'm wrong.

[calvinhobbesliker2]

Actually, I think it'd do zero work as the force is not in the direction of the displacement.

[projectisaac]

you do a very good job explaining the material.

[algwins]

Thanx a lot, that was brilliant stuff, keep up the good work ! =)

[Mitro3488]

It's people like you that honestly help the world progress. You know it well and explain it without circumlocution. Thank you very much, I finished this challenging homework problem in seconds after you helped me UNDERSTAND the material.

[sorrysonofa]

great video!

[tisovcik]

Great video, helped me so much that you can't even imagine. I didn't understand it after 11 hours of studying it and now I get it after a few minutes. THANKS!!

[Plutoniummatt]

absolutely excellent, top stuff!

[kissyoko]

great!

[redstahr]

once again, thank you!!! you have no idea how much you've helped.

[Nandine2]

do videos on the principles of moments please I just don't get it!

[Waytopro4u]

1st again