Voltage | Introduction to electrical engineering | Electrical engineering | Khan Academy

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22 thoughts on “Voltage | Introduction to electrical engineering | Electrical engineering | Khan Academy”

1. Gonçalo Aguiar says:

I prefer the hydraulic equivalent, where voltage is pressure and current is flow. Or the thermal equivalent where voltage is temperature and current is the heat flow.

2. omar 23 says:

I'll come back when the khan part of this academy returns…

3. Rohit Roshan says:

thts wht i was looking for , great explanation

4. rabiul islam Bijoy says:

I appreciate your effort sir and great video also. but we want khan to make some videos because we are familiar with his voice. he is like a big brother to me..every thing is good in this video..but we would much appreciate if sal made some video.

5. Abhishek Ravindra says:

When will Sal do a video.

6. L. higgins says:

7. Balathandapani K R says:

please note that electrons come out of positive terminal of battery. confirm the understanding please.

8. Fairy Tail says:

So the longer my circuit the more voltage! awesome! jkjk

9. Enter a name here says:

It could hit a bear. Haha!!!

10. treyway 69 says:

I don't really get this video. Is the main point just ,the longer the circuit the higher the voltage? It didn't really explain what voltage really is and how it works. This video doesn't really help me. 🙁

11. Rubai Ghosh says:

well i like it

12. domain mojo says:

Excellent analogy!
Wish I heard it explained like this when I started out.

13. 17joren says:

So is an electron changing energy types in the circuit, the same way a mass going down a mountain loses potential energy while gaining kinetic? A constant voltage makes me consider the electron has constant energy.

14. Lopamudra Kar says:

Good. This tells us that Voltage refers to the amount of work done move a unit charge. Also, when a charge moves from one terminal to another, it loses its energy but battery is there to provide more energy. It will be better if I first watch another voltage video on Electric Potential Energy and Potential Difference!!

15. Ranchander Sahu says:

So the electrons are accelerating…..😮😮

16. Tanvir Amin says:

Magnificent

17. Connor Fisher says:

I prefer actual explanations which describe the interactions that are occurring. Instead most of these lessons are allegorical in the sense that they use examples of situations that are not electrical in nature. Honestly I don't even like the comparison of electricity flowing in a wire, to water flowing in a pipe. This doesn't give you a realistic picture as to the actual phenomenon that is defined as electricity. Electrons flowing in a wire is one way to look at electricity. Another way is to look at field interactions, and personally when I take up the perspective of the latter view; I feel that I can gain a greater understanding of electrical theory. Just look at the works of heaviside, C.P Steinmetz, and Ernst Alexanderson. There is no talk of electrons when they describe their theories, and these men have practically established the field of modern day electrical engineering. Especially in regards to the utilization of radio waves for the transmission of information or power. Physicists have surely confused the field of electrical engineering with their strict labels, and narrow minded assumptions. The nature of magnetic, and dielectric fields are incredibly complex. They cannot be reduced to the interactions of electrons, which in and of themselves are a product of human thought in an attempt to understand the non physical fields that are permeating space. Electricity is not an effect of microscopic billiard balls floating in empty space. I apologize for being so blatantly arrogant, but I simply cannot conform to the modern definitions of electricity. They all fail to satisfy an inert sense of longing within myself, to greater understand the mysteries that arise when one contemplates the nature of electricity itself.

18. Johan Ariff says:

One problem with this hill-gravity analogy is that it gives the impression the charges gain speed as they roll downhill, which is not true. It may even lead to other misconceptions when the analogy is stretched further. Also, I see many tend to put in too much physics into circuit analysis when (imao) it should only concern with mathematical manipulation of some functional relationships according to some physical laws.

19. Snake Films says:

Question is if electrons can go in the positive proton battery then can protons go in the negative electron battery

20. lh liang says:

Voltage looks like a mystery. No book I've read really explains what is actually voltage. They always use analoy to show the concept. Please think criticlaly. I think we'd better go back to the day Ohm made his experiment. How to measure the voltage at very beginning? How did he make assumptions about the force which generates electricity? Educators pls don't fool our kids any more. Please show the history of how the concept forms.

21. Sckarlet says:

Every time i watch a video about voltage hoping to understand what it REALLY is, all i get is analogies i am hopless now.

22. Alan B says:

Did the bear survive?