Electric potential energy of charges | Physics | Khan Academy

In this video David explains how to find the electric potential energy for a system of charges and solves an example problem to find the speed of moving charges.

Physics on Khan Academy: Physics is the study of the basic principles that govern the physical world around us. We'll start by looking at motion itself. Then, we'll learn about forces, momentum, energy, and other concepts in lots of different physical situations. To get the most out of physics, you'll need a solid understanding of algebra and a basic understanding of trigonometry.

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[samarsurya]

Hey khan, to be honest, the level of clarity, depth of understanding, way of explanation are simply awesome man..your videos are mind blowing..My humble request to you "PLEASE DONT STOP ANYWHERE"..keep uploading more and more videos in physics

[luizasaunders]

Apologies to Sal for this comment, even though it is intended, if anything, as constructive criticism - but the way David explains things is so much clearer. He does not feel the need to fill in every bit of time with words (which I'm sorry to say oftentimes comes off as rambling with Sal), but speaks eloquently, letting us take it in. Also I can tell the graphics are cleaner as well, I'm sure Sal can implement this. But the slower and better organised mode of speaking, the clear explanations, for me they make David preferable for me. Please make more videos

[bohanshan]

I really liked how he explained what each of the values meant. Keep up the good work!

[reetichauhan]

How is no one talking about his ability to draw perfect arrows?? ( well, obviously apart from how good he teaches)

[gurmeetsaroha]

I m feeling sad for the channel as it is theee best channel for physics but always have no words how much he has helped me in understanding concepts. He always takes the exact doubts which arises in my mind in his Amazing Channel if anyone want to study

[thomery]

This is so helpful!! Thank you so much 😊

[evie_]

2:12 Where's the link? It's not there in the description -_-

[umarpatel]

"This is physics so they don't care" lololololol

[jatrophalouvre]

isnt k the coulomb constant and not the electric constant?

[They.envyMina]

Even though I'm watching this 5 years later and I still think that David's a wonderful teacher, I can't help but notice that when I multiply the values in the first problem he solved that I got different values from what he got. Because where he got 2.4, I got 5.4 and where he got 0.6, I got 1.35 :(
It's either my calculator's broken or I prolly missed something
Can someone please explain :(

[LethalAvenge]

Need derivation video link and also if you can make it available in Hindi on channel "Khan Academy India"

[gunankhora]

what if the masses were different, use energy conservation and conservation of linear momentum in the horizontal direction to get the 2nd relationship between velocities. 0 = m1.v1 + (-m2.v2)

[orangedeer]

In Current and Electricity what is the higher potential... Guys this thing is messing me soo much..
I don't know why but i can simply get this thing clear.. My Exams are just around the corner.
I have Questions of which I need some simple answers.
1.What basically is the electricity??
2.Do electrons flow from Positive terminal to the negative terminal or from the negative terminal to the positive terminal.
3. What does actually flow: Protons or Electrons?
Please reply to me...
Thank you in advance.

[nisreena]

What if the masses weren't the same? would you need more information to solve for their velocities?

[NicholleWillisLoves]

I really loved this video because the speaker is so funny. ^^

[niclasell]

But how do you find one of the speeds using conservation of energy if the masses aren't equal?

[vivekgupta]

*_Summary Of The Video :-_*

*Electric Potential Energy*

*Definition* - The amount of work done in assembling the charges at their location by bringing them from infinity.

* A single charge can not have any potential energy.

* We need at least two charges to have potential energy at all.

* SI UNIT - Joule.

* Potential energy is a Scalar Quantity.

[jesussaquin]

if their masses would've been different their velocities would of also been different?

[Moravistan]

3:39 isn't the unit for electric potential energy Volts?

[mohanadabdulrahim]

What does a negative potential energy mean?