Bless yo face, finally got an intuition about voltage, it's a difficult concept to grasp, but once you get it, everything becomes easy. Now I wanna know why voltage drop and voltage rise equals zero, and what's that all about

Ok this is a best explanation of voltage on youtube, others including analogies with water are absolutely garbage

@gaganjangle2276

6 жыл бұрын

so true! keep it up man!

I have watched many videos that try to explain what voltage is, and this is by FAR the best explanation I have ever received. Thank you very much for making this.

Finally! Found a normal video that explains everything after watching dozens of other. Thank you!

Best explanation on KZread I can find for volts. Thank you very much.

Probably the 10th video (at least) I've watched trying to explain voltage and I think this one probably sealed it for me..Thanks

Hands down the best explanation of voltage I've ever come across. Kudos!

Thought my brain would explode from not being able to understand voltage but you solved that

A huge thank you for finally helping me understand the principle of voltage!

great video...a very clear practical explanation.....hats off sir ....i've never come across such a good explanation...........

much better explanation that just saying voltage is electrical pressure.

Thanks for this! I'm trying to learn more about electricity, AC/DC, etc. and this was a great first vid to get me started.

This video is really helpful. Almost all reference material I have read introduce voltage as part of a resistive circuit. While it's great as an inroduction, it doesn't give you a clear idea of what voltage actually is. It gets generalized as some magical number which is related to current and resistance. This video actually tells you how voltage is related to charge and potential energy, and more importantly why you measure voltage across two points (cause it's potential DIFFERENCE).

Thank you for explaining Voltage, been struggling with it a bit. Also, your voice has an eerily soothing quality to it.

@jehsiman

10 жыл бұрын

hahah wtf

Awesome video man. Very comprehensive. Just what I needed.

This is the best explanation ever. Thank you. Thank you.

Finally I understand what Voltage is! Thank you very much!

I liked how you accurately called it "electric potential difference" because that gets to the core of many misunderstandings.

By the way thank you for making this video. Currently on my second try of Physics 2 in college, failed it the first time. Your lecture is alot more clear then my teacher's, who just assigns problems and expects us to pull stuff out of our ass basically. I really dont wanna fail and im spending entire days trying to understand this before i fail my exams again.

If there is a point charge of some magnitude existing all by itself (lets say its a positive charge) there will be an electric field emanating outwardly from it in all directions, yes? The strength of the field gets weaker as you get farther away from this point charge, yes? So there is a difference in magnitude of the electric field at a point lets say 1 cm from the charge as opposed to 2 cm from the charge yes? Does the voltage between those two points depend only on the difference in electric field strength? In other words, could you say that IF, in the scenario I described above, a 1C positive charge were placed 2 cm from the point charge, the voltage between that point and the point 1 cm away would be the amount of work necessary to move this 1C charge FROM a point 2 cm away TO a point 1 cm away?

this is what I've been looking for! thanks!

Thanks for the swift reply, I actually saw "Lesson 2 of 2", in that video you show electrons moving left to right in the AC circuit example. I was hoping you can elaborate on how this relates to the Sine Wave. Is the Sine Wave looks like current moving in a wave forward in time?? but current (moving electrons) moves back and forth? What does the negative arc in the sine wave represent, negative current??

very informative and intriguing, totally open my mind to better understand voltage

Hmm, ok. Thank you. I still need to do some work on this subject. Do you have any recommendations for reading material? Any good textbooks or articles I can find online or anything?

That was so easy.. I mean you made it easy for me to understand. Well, you are an excellent teacher, to be concise ! :D

Super cool lesson! Thanks

Thanks a lot dcaulf. Definitely cleared my voltage understanding up more than enough. The only part that confused me was how there's a Joules per Columb in the Voltage canceling out with Charge during the example at 9:50. I'll just keep studying. I'm just trying to get some background knowledge before I pursue a Info Tech degree. Thx again Sir.

purely good video.. thanks Dcaulf :)

best description I've been able to find. I'm tired of hearing about water hoses! I understand that the moving electrons create an electromagnetic wave, but what about the electrons themselves? Is the pushing/pulling considered a periodic mechanical wave at 60cps (one electron pushing the other) or is not a wave at all? Specifically I'm interested in audio signals as they operate at many different frequencies. Is that a mechanical wave of electrons or something completely different? Thanks!

Thanks saved me a lot of time. Very well taught easy to learn thanks again XD.

This video is great!! i love your explanation so much :) so can i say material with more electron have more potential energy?

Hi dcaulf, thanks for replying. I think I'm getting closer to the answer. So if I just say 'Voltage is the electric potential energy that one coulomb of charge requires to move between two points', is this acceptable? You'll notice I excluded the word difference. By saying that it is what is required to move between two points, is also saying 'difference' just redundant? Or am I confused?

Great video. Thank you.

Outstanding explanation!

Thank you for the video is well informed.

Hi! Very helpful video! I have a question. In a book I read that what you are talking about is the change in voltage. Now, for the actual voltage at a distance r from charge Q they gave the equation (kQ)/r. What is the relationship between these two equations? Thank you!

Hey dcaulf, I've got a question again. If you have a voltage source, say a battery, and you connect a wire to the positive side (just extending the voltage out), that conductor should go to the same potential as the positive terminal of the battery. In order for that to happen, would the electrons flow from that extending conductor, down through battery and into the negative side? In other words, "open-circuit current"? (1 of 2)

Best ever explanation l have watched thank you very much

(part 1) no worries. My original question could have been a little clearer. I'm familiar with how the acoustics work and how the sounds are transduced to voltage. What I was looking for (and I think you answered it) is how the electrons move in the wire. From what it sounds like the electrons are being attracted to a lower density rather than pushing and pulling. So it's not a periodic mechanical wave of electrons....

Nice. I'll let this soak in for a while. Thanks man.

Thanks. Makes allot of sense!

You are great! Thank You!

(2 of 2) The same thing would apply if someone floating in the air touched the hot lead of a 120V wall outlet. They aren't completing a circuit, but won't the charges in their body feel the attraction of the positive source and thus be made to flow? Thanks so much dcaulf

GREAT explanation.

You have a great way of explaining the basic concepts of current and voltage.Can you please put out a video or explanation of Alternating Current?!?, How does it flow forward if the electrons move back and forth? How does the sine wave represent the alternating flow? 60Hz, ya I understand that means 1 coulomb moves 60 times across one point over 1 second, but that doesn't explain the flow?

Thanks! this is really helpful!

Excellent explanation. 5 stars

brilliant vid!!

Wait so, if a coulomb equals to 6.24 x 10^18 electrons, does that mean that there are also an equal amount of protons at the other location, which creates the voltage? What does change in potential energy (joules) mean and play into this? I'm trying to figure out the formula v = (change in PE)/q

if i power 2 12 v motors with a 24 v adapter would they both receive 12 v?

Great answer. Now, I am wondering if the definition can be taken up a notch to say "Voltage is the work that one Coulomb of charge requires to move between two points in an electrostatic field caused by an imbalance of charge between two materials." Is this going overboard? Also, about the word 'requires', is that correct? Does it require, expend, or transfer, and from what point of view?

So when we say "what is the potential at this point" is that like saying if we put 1 coloumb at that point, what is its potential energy?

I think I'm starting to get this a little bit. I see that you said that a joule is how much work that can be done per each unit of charge (coulomb). I just don't understand what the point of the joule is, wouldn't how many units of charge determine how much work could be done?

(part2 )...but rather a periodic change in potential that attracts or repels the electrons. This periodic change in potential is (or should be) analogous to the original acoustic wave (hence "analog" audio) and as a result when it is transduced on the other side by a speaker it should sound like the original. The better the quality of the components...the more it is able to accurately transduce the original acoustic waves into periodic change in potential. Does that sound correct?

Good stuff, Thanks

If you were interested in sticking with the established convention, shouldn't the direction of the voltage arrows be pointed in the other direction, i.e. from positive to negative?

Thank you so much for the awesome explanation!! Just if anyone may be able to explain the part about the equation to me it would be much appreciated. To be honest it's probably in the video (I know you do discuss it) and my confusion is probably simply based on how late it is and my lack of knowledge on the topic but: - I never understand the equations!! Why do we need to divide the Change in potential energy by the Coulombs to get the voltage?? What exactly are coulombs, and how do we know when it's one coulomb of matter? What is charge? Why divide? How does this link to the voltage? Is the charge the amount of energy the electrons and protons have to attract each other? (Sorry it's late I'm probably just being stupid to be honest)

great video thank u so much

great video

10:58, why would all of those electrons move to where there are only two protons? I would assume that as soon as two electrons meet with the two protons, the newly neutrally charged area would prevent the remaining negatively charged electrons to stop moving towards it.

So how about this: Voltage is the difference in electric potential that one coulomb of charge experiences from moving between two points. (which is basically what you say in the video), but how about adding to the end of that sentence 'in an electrostatic field'? That's what it seems to say in the wikipedia entry for voltage. Do all cases of voltage fit this definition? If possible can you provide a little more insight on the electrostatic field part. Thank you so much.

You do a very good job of explaining voltage. Believe me I have asked hundreds of people this question and you have formulated a very precise answer. However, I still just don't get it 100%. If it is a 'difference' how come there is no subtraction sign in the formula for voltage? If we look at the image at 6:50, the electron has a potential energy before it moves. Then when it moves it still has potential energy. So the difference of the two potential energys divided by 1 coloumb is the voltage?

This video is fantastic but I have a problem. If Voltage is the difference in potential difference, suppose an electron were to travel from one location to another, does the electron gain kinetic energy (ie, potential -> kinetic), if not, what happens to the potential energy?

awesome! thank you

At last a good explanation with good conceptual diagrams which lead to the equations nicely. Other vids lack the primary idea of the electrons 'wanting' to move to remove an imbalance and this force being useful for work. The famed hydraulic analogy sucks. This explanation fits well with DC chemical battery power, what about generators? Also why does a bird on a power line not get fried?

Can you tell me what will happen if I conect the neagative to the ground?

Thanks!

1. I still don't get why you get 1.5V on two side by side batteries and 3V when you stack them up. Unless we say when they are stack one on top the other, electrons flow from one battery to the other, making the recipient of ending up with more charge. in this case though, don't see why electrons will flow from one to another if these batteries have the same charge. I am confused. 2.on the alternating current, the how does the current change direction? which wire to which wire?

You nailed it on the head literally, now i understand why my teacher was talking about charges re-distributing in a sphere and hanging out at the surface ? i guess

Some still define electric potential as the work done in bringing a unit "positive" charge from one point to another point. I somehow have a problem with that definition because as has been pointed out in this video, the ones which are actually moving are the electrons(negative charge) not the protons(positive charge). Would appreciate a reply from anyone. Thanks. :)

Wow, this settles all I've wondered about voltage. I totally brofisted my laptop at the end.

The way I try to understand it is, at point of contact, electrons move from the top battery (-) terminal to the bottom battery (+) terminal. They continue to be repelled by electrons arriving in their place and move within the bottom battery towards its negative terminal until voltage equilibrium is reached at 3V between the two terminals of the bottom battery. Your way still not clear, if two conductors must go to the same V, then they should go to 1.5V when they are stacked.

So if you connect a cell of 12 volts with a wire having 0 resistance, and no device connected, then where would the energy go?

How did you get from 10,000C * 12V = (Change in PE) to 120,000J = (change in PE)?

This is confusing, negatively charged atoms transfer their excess electrons to positively charge ones but it goes from + to - in your battery ?

Thanks, but them birds still got little ol' me beat. Why doesn't the current flow up one leg and down the other (frying the bird) just like a regular 'spur' or loop on a circuit and carry right on around? Is it the higher resistance of bird vis a vis wire that stops it? Why the need for ground? Do all circuits have a ground?? I'm just starting out so its still puzzling me.

I'm still confused about this. Why is it then that you can connect only the positive terminals of a car battery and connect the negative terminal of the charged battery to the frame of the dead car and still charge the dead battery?

And if it does gain KE, if it reaches the end location, what happens to the KE? :/

Dude you should make a video for ultrasonic piezoelectric transducers known as acoustic emission transducers plz :D

it's 2:40 am in the morning and im fking awake. Now i need to learn something since im totally awake

I know it's AC. Speculating that the bird feels 'something' is only adding to the mystery! Do you think they enjoy it? :)

You said that when the electron is in a place of -ve charge, it has higher potential energy and when it goes to the place of positively charged particle,it has less potential energy. Where does the energy of the electron go? Isin't it the violation of law of conservation of energy?

great video. you broke it down in plain english.

I meant to say the difference in electric potential energy*

Great video, although I almost broke my screen

okey dokey

I thought electric potential and electric potential energy are different? why you say they are same

Electrons don't flow freely...they exist in bonds on the atoms and molecules they are an intrinsic part of. It is not simply a river of ionized particles. Electrons are energized to higher states. What do you consider as a "boundary" in your scenario? The over-smiplification by using graphical examples to make it easier for students to grasp the concept degrades the physics behind energy generation. What is ESF *as I called it*?

there are no ideal conductors , ressistance close to zero but never exactly zero

Fist-bump lol

when i first heard this, i thought you were talking about sex for some reason

So what really creates current is the electric field. Voltage is a human concept since its describing things such as "potential" and "difference"? electric field and current are natural phenomenons while Voltage and resistance are human concepts? This stuff is so tricky. All this stuff in Physics is thrown out the window in electronics, creating so much grief to me.

Oh my god. Pulling electrons off of the wire? Are you serious? Tiny and move super fast? Could you be any wronger...and I am totally serious. Electrons are not added and removed in order to generate electricity. Electrons are moved to higher states of energy by an electromotive force. That is what generates voltage and current causing "electric potential difference". Electrons actually only move millimeters per hour, but oscillate very rapidly. This isn't a flame, just needling re-education.

worse explanation for voltage!!! sori