Electrical potential is different from Electrical Potential Energy, but this definition doesn't tell the reader that. This is a common misconception, and I think that it would be very useful if the distinction was made clear here.f
Electrical potential is the potential energy per unit charge seems OK, please explain.-- Patrick 10:55, 31 May 2004 (UTC)
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Any reason why the color gradient is the OPPOSITE of the energy gradient - shouldn't the highest potential (highest energy per unit charge) also have the highest energy visible spectrum color (shortest waves eg violet) and the lowest potential have the lowest energy color ( long waves hence red)? 2A02:ED0:6D8E:DC00:1B8:C489:EFA7:28BA ( talk) 08:42, 29 December 2020 (UTC)
Shouldn't this redirect to Electric potential, rather than the other way around? 'Electrical potential' sounds to me like a pernicious neologism, born of people's tendency to add '-al' to the ends of words that they're unsure of. My physics text uses 'electric', and a Google test also turns out in my favor (though less than overwhelmingly). -- Smack ( talk) 03:49, 18 Feb 2005 (UTC)
Since voltage is by definition a "potential difference", a potential must be able to be measured with no reference. How is this done?
Is it correct to think of a potential as "the voltage relative to infinity"? I mean infinite distance. - Omegatron 21:26, May 30, 2005 (UTC)
Similar question: If I have a piece of metal with one less electrons than protons (or a single atom with one less electron than protons), that object has a definite charge of +1, correct? The object's charge is an absolute quantity. Does that object have an absolute potential? Or does potential always involve a reference value? - Omegatron 00:17, May 31, 2005 (UTC)
Omegatron is making a valid point which Smack does not engage with. The definition given in the 1st paragraph of the main article is unsatisfactory for several reasons:
1) qt is not defined.
2)'Energy at a point' is a void concept as far as I can see. This should be replaced by 'energy of a small test charge qt at that point, relative to some other point'
3) the main point made by Omegatron refers to the reference position with respect to which the potential energy of qt at the point in question is measured. The concept of potential energy requires that this reference position should be identified, and the given definition of electric potential makes no mention of this reference position. The definition is therefore meaningless, and Omegatron is correct to draw attention to this defect. Smack's comment about a line integral is appropriate, but the definition given in the 1st paragraph makes no mention of this.
4) Personally I do not accept that the line-integral function is a definition of 'potential'; it is in fact a definition of 'potential difference' between points corresponding to the limits over which the integral is evaluated. Again, I see this as being the conceptual objection to which Omegatron refers, and it is a valid one. If you wish to talk about 'potential' in an absolute sense you must define an appropriate absolute reference point, and that is what I understand Omegatron to mean when he talks about 'relative to infinity' - a point infinitely distant from all charges.
Overall I am astonished that so many years have passed without a more serious-minded definition being given.
Andrew Smith — Preceding unsigned comment added by 82.32.48.177 ( talk) 10:32, 14 December 2011 (UTC)
I teach technicians electronics and all the mathematical mumbo jumbo does not help them to obtain an understanding of the difference between emf, voltage drop & potential difference.
I teach that an "emf" is a source of electical energy which can motivate electrons around a circuit. Ie. it has to be an energy source of some sort either a battery or a power supply, a charged capacitor, the voltage produced accross an inductor when there is a changing magnetic field, a illuminated solar cell etc. Disconnect it and electrons stop moving and the circuit does not go. In a purely resistive circuit the current is always phase with the voltage
A "voltage drop" on the other hand is the voltage difference accross a load when a "current flows" through it. The current and voltage in a purely resistive the current and voltage are always 180 degrees out of phase.
A "voltage or potential difference" is the difference in voltage between any two points in a circuit, which could be an emf, a voltage drop because of a current or could include the voltage accross an "open circuit", through which no current flows at all"
Ie. In a wheatstone bridge, an "emf" is applied accross two arms each arm comprising of two resistors. A current flows through each arm producing voltage drops in each of the four resistors. A voltage difference, exists accross the open circuit between the centre points of the two arms (dependent on the balance in the bridge of course) whilst the current is 0.
As a result I use E in ohms law where I calculate the current from a power source and V where I calculate a voltage drop.
Lee de
Hi Lee, as a professional electical engineer it seems to me that the distinctions you make are entirely false and misconceived. There is absolutely no qualitative difference between a 'voltage drop', a 'voltage or potential difference' and an 'emf', and to suggest to your students that there is any difference is to mislead them completely. The fact that a voltmenter responds identically to these quantities should alert you to the possibility that they are precicely the same kind of thing. The effect that these quantities have on an electric charge (such as an electron) is also qualitatively identical; in a typical oscilloscope circuit, the electrodes of the cathode ray tube are usually connected to different points in a resistive potential-divider , and the so-say 'pd' has exactly the same effect on the electrons in the tube as a source of 'emf' would have. Perhaps the distinction that you are striving towards is that between a component which acts as an energy source (such as a voltaic cell, a charged capacitor, an inductor carrying a current, etc) and one which acts as a dissipator of energy such as a resistor. But even here you should be aware that components which act as sources of 'emf' (and of energy) can very easily become energy sinks with 'pd' simply by reversing the direction of the current. In an AC circuit a capacitor or inductor makes this change every cycle, and can do so in a DC circuit as well, depending on whether the component is being 'charged' or 'discharged'. From the point of view of circuit analysis the only useful distinction is that between components in which (at a particular instant) the current opposes the pd (energy being stored or dissipated in the device), and those in which the current is in the same direction as the pd (energy being delivered by the device). This distinction must be observed when drawing up the equations used in dc circuit analysis. Notice that this distinction is between electrical components, not between supposedly different types of voltage, which is an absurd notion. Andrew Smith — Preceding unsigned comment added by 82.32.48.177 ( talk) 12:56, 14 December 2011 (UTC)
when we connect a charged conducting sphere to the ground , what happened to the charge on the surface since the electric potential (v) on it is zero"??? —The preceding unsigned comment was added by 213.209.187.34 ( talk) 02:25, 17 December 2006 (UTC).
This article is excessively technical. While all the math is relevant in a higher-level mathematical context, to the everyday reader, this article is almost completely useless. Perhaps a section can be added which explains the concepts of electric potential in a layman's, non-multivariable way, but also with simplified, relevant mathematics. —The preceding unsigned comment was added by 199.90.6.26 ( talk) 00:11, 2 February 2007 (UTC).
cause it is electrostatics in everyday 3-d space. i agree, make a 1-d electro statics section.
Variables are not defined
134.154.242.29
15:05, 9 February 2007 (UTC)
As a student studying just starting to study this material this article is almost impossible to even approach. There should be a discussion of EP in 1 dimension then the article can go further. —Preceding unsigned comment added by 141.213.66.73 ( talk) 17:30, 17 September 2008 (UTC)
You are entirely right. I thought Wikipédia was intended to be a tool useful for as large a number of users as possible, not just to be a series of technical notes for use by higher level technicians and scientists. Ptyxs ( talk) 14:32, 7 December 2013 (UTC)
So is it a vector? The article doesn't seem to be too explicit about it. 160.227.129.254 23:07, 1 May 2007 (UTC)
Damn it. I had a test and wrongly answered it was a vector. You have failed me Wikipedia! Only kidding. But seriously, can we have that somewhere on the article? Its kind of important. Tourskin 22:20, 2 May 2007 (UTC)
Electric potential is measured in volts, while electrostatic potential [energy] is measured in joules. Why does the article say they're the same thing? Lecture 4 explains the difference (MIT OpenCourseWare). — Pengo 07:35, 31 August 2007 (UTC)
I have thought for a while that the electromagnetism template is too long. I feel it gives a better overview of the subject if all of the main topics can be seen together. I created a new template and gave an explanation on the old template talk page, however I don't think many people are watching that page.
I have modified this article to demonstrate the new template and I would appreciate people's thoughts on it: constructive criticism, arguments for or against the change, suggestions for different layouts, etc.
To see an example of a similar template style, check out Template:Thermodynamic_equations. This example expands the sublist associated with the main topic article currently being viewed, then has a separate template for each main topic once you are viewing articles within that topic. My personal preference (at least for electromagnetism) would be to remain with just one template and expand the main topic sublist for all articles associated with that topic.-- DJIndica 16:36, 6 November 2007 (UTC)
The electric potential is not a lorentz scalar, it is compontent of the 4-vector . Adiel lo ( talk) 07:39, 26 May 2008 (UTC)
To further that comment. The second sentence is factually incorrect. The electric potential is indeed not a Lorentz scalar. ( SeanH ( talk) 23:12, 1 January 2009 (UTC))
I spend most of my days on the biology articles yelling at the scientists for making the articles too complicated. Maybe I should appologize to them, because you guys are just so much worse. This article might as well have been written in a strange, obscure language. No effort has even been made to simplify the material. Paskari ( talk) 21:19, 28 August 2008 (UTC)
I'm basically trying to figure out how ions moving across the cell membrane can lead to, and alter this bizarre thing called the membrane potential. No one even explains why there is a membrane potential. I wish someone could give a simple explanation such as the concentration and type of ions lead to different electric potentials. The outside solution has more sodium ions so it's more positive.... Instead they provide weird answers such as concentration gradients lead to a voltage across the membrane. Paskari ( talk) 21:27, 28 August 2008 (UTC)
It has been known to research scientists in some branches of science, for about 60 years, that "voltage" and "electric potential" are slightly different concepts. However, this doesn't seem to have made it into some physics textbooks yet, and there is lot of confusion on this issue around. I hope no-one is going to mind, but I have removed from this article all technically inappropriate references to voltage, so that this article really does become an article on electric potential (sometimes called electrostatic potential). At the time of writing, there is a modern electron-based definition of "voltage difference" in the article on "voltage". (You can start by defining "voltage difference" to be what you measure with a voltmeter, and then ask what scientific quantity it is that you are actually measuring. Quite often it is NOT electric potential difference.) At the time of writing, there is fuller discussion of the issues in the articles on "electrochemical potential" and "Fermi level", and related links and discussion pages..
I have also removed the equations that were formulated in one of the cgs systems of equations. There was international agreement nearly 40 years ago to gradually discontinue these systems of equations, and to concentrate on the single system now used for teaching in most universities. Most current students (and, I suspect, many lecturers) do not understand that there are several possible systems of equations, and most people do not need to understand anything other than the system currently used [i.e., the (rationalized) metre-kilogramme-second-ampere system that forms the basis for SI units]. If you are one of the few that do, then you will find it easier to look this up in a well-written article elsewhere. In my experience, nowadays it simply generates confusion if we try to explain basic concepts using a near-obsolete and disused equation system. ( RGForbes ( talk) 19:52, 10 April 2009 (UTC)) Richard
'Electric potential difference' redirects here, but nowhere in this article does the words 'electric potential difference' occur. —Preceding unsigned comment added by Loldrup2 ( talk • contribs) 21:44, 25 May 2009 (UTC)
The first sentence appears to have incorrect and cumbersome grammer. Presumably the charge discused is singular and the sentence becomes cumbersome without modification- suggesting more than one possible meaning to the reader.
I agree I think it should read "...aItalic text specific point".
Nabla A-vec(r-vec,t)=-mu*J-vec(r-vec,t) sry, dont know how to write this properly. A-vec and the rest indicates a vector. mu = permeability of vacuum. Maybe we should ad this as well as a definition of electric potential. —Preceding unsigned comment added by 134.184.101.26 ( talk) 20:22, 5 October 2010 (UTC)
I find the animations are so confusing as to be completely useless. I just have no idea what's going on. It doesn't help that the text and equations are mostly unreadable, and that the captions contain no further explanation. But even if those could be fixed, the bigger problem is, they seem to be videos captured directly from applets, constructed to be played with rather than constructed to clearly visually explain an otherwise-confusing pedagogical point. Therefore I propose deleting all three animations (see now-current version of the article). What do other people think? -- Steve ( talk) 13:59, 9 August 2011 (UTC)
It seems that the electric potential is "the amount of electric potential energy" per unit charge but only for an infinitesimal charge. Often if I place a finite charge Q in some location, then the charges in nearby materials (dielectrics, conductors, etc.) will reconfigure and the electric potential will change, in a way that depends on the amount Q. In those cases the change in electric potential energy is not strictly linear in Q. I'm referring here to image charge potentials and such related things. It could be clarified by saying:
-- Nanite ( talk) 07:18, 17 July 2013 (UTC)
The Introduction section briefly talks about the concepts of forces and potential energy, and then there is this sentence: "As an object moves in the direction in which the force accelerates it its potential energy decreases".
This makes it sound like any force acting on an object will reduce its potential energy, which is wrong. If I pick up an apple, I accelerate it upwards and simultaneously increase its potential energy. Maybe "the force" in this case only refers to the force generated by the field that gives the object its potential energy, but that's not made clear, and it is probably too confusing for what's supposed to be a simple analogy. Seban678 ( talk) 09:22, 28 April 2015 (UTC)
Please note the earlier discussion of this article at Wikipedia talk:WikiProject Electrical engineering#Three articles, two concepts Oiyarbepsy ( talk) 04:09, 21 May 2015 (UTC)
What type of movement of electric charges, used for defining the electrostatic field and its circulation, can occur in an electrostatic potential, where charges are supposed not to move?-- 82.137.13.51 ( talk) 19:16, 22 October 2018 (UTC)
On section "Generalization to electrodynamics" of this article it says "When time-varying magnetic fields are present (which is true whenever there are time-varying electric fields and vice versa)". It says that if there are time-varying electric fields, then there are time-varying magnetic fields.
But as far as I know, that's not necessarily true. For example, in magnetostatics there are static magnetic fields but time-varying electric fields (because there are currents, but they're steady/DC not AC).
This mistake should be fixed. Alej27 ( talk) 12:31, 6 January 2021 (UTC)
what is \mathbf{r}' in this equation in section "Electric potential due to a point charge"
I think it would be good to make that clear to readers, it is not clear to me for example. 15:00, 21 June 2021 (UTC)
“is defined as [….] the amount of work energy needed to move a unit of electric charge from a reference point to the specific point”
So in other words “to move from A to B” right? (Any one movement is from place A to B. This is obvious.) Why this emphasis on reference point right in the beginning? This is not relativity.
Khan academy defines as “Electric potential energy is the energy that is needed to move a charge against an electric field”. Simple, although might not be 100% accurate
Physics.info defines as “The electric potential difference between two locations is the work required to move a test charge from one location to another divided by the magnitude of the test charge.” Also simple but needs more context on magnitude of test charge. Aiecon ( talk) 02:17, 18 October 2021 (UTC)
The description emphasizes electric field lines (lines perpendicular to the balls), but shouldn't the lines of constant electrical potential (the equipotential lines perpendicular to the field lines) be mentioned as well, considering that's the topic of the article? BennyWahWah ( talk) 20:32, 12 October 2022 (UTC)
Electrical potential is different from Electrical Potential Energy, but this definition doesn't tell the reader that. This is a common misconception, and I think that it would be very useful if the distinction was made clear here.f
Electrical potential is the potential energy per unit charge seems OK, please explain.-- Patrick 10:55, 31 May 2004 (UTC)
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![]() | This article links to one or more target anchors that no longer exist.
Please help fix the broken anchors. You can remove this template after fixing the problems. |
Reporting errors |
Any reason why the color gradient is the OPPOSITE of the energy gradient - shouldn't the highest potential (highest energy per unit charge) also have the highest energy visible spectrum color (shortest waves eg violet) and the lowest potential have the lowest energy color ( long waves hence red)? 2A02:ED0:6D8E:DC00:1B8:C489:EFA7:28BA ( talk) 08:42, 29 December 2020 (UTC)
Shouldn't this redirect to Electric potential, rather than the other way around? 'Electrical potential' sounds to me like a pernicious neologism, born of people's tendency to add '-al' to the ends of words that they're unsure of. My physics text uses 'electric', and a Google test also turns out in my favor (though less than overwhelmingly). -- Smack ( talk) 03:49, 18 Feb 2005 (UTC)
Since voltage is by definition a "potential difference", a potential must be able to be measured with no reference. How is this done?
Is it correct to think of a potential as "the voltage relative to infinity"? I mean infinite distance. - Omegatron 21:26, May 30, 2005 (UTC)
Similar question: If I have a piece of metal with one less electrons than protons (or a single atom with one less electron than protons), that object has a definite charge of +1, correct? The object's charge is an absolute quantity. Does that object have an absolute potential? Or does potential always involve a reference value? - Omegatron 00:17, May 31, 2005 (UTC)
Omegatron is making a valid point which Smack does not engage with. The definition given in the 1st paragraph of the main article is unsatisfactory for several reasons:
1) qt is not defined.
2)'Energy at a point' is a void concept as far as I can see. This should be replaced by 'energy of a small test charge qt at that point, relative to some other point'
3) the main point made by Omegatron refers to the reference position with respect to which the potential energy of qt at the point in question is measured. The concept of potential energy requires that this reference position should be identified, and the given definition of electric potential makes no mention of this reference position. The definition is therefore meaningless, and Omegatron is correct to draw attention to this defect. Smack's comment about a line integral is appropriate, but the definition given in the 1st paragraph makes no mention of this.
4) Personally I do not accept that the line-integral function is a definition of 'potential'; it is in fact a definition of 'potential difference' between points corresponding to the limits over which the integral is evaluated. Again, I see this as being the conceptual objection to which Omegatron refers, and it is a valid one. If you wish to talk about 'potential' in an absolute sense you must define an appropriate absolute reference point, and that is what I understand Omegatron to mean when he talks about 'relative to infinity' - a point infinitely distant from all charges.
Overall I am astonished that so many years have passed without a more serious-minded definition being given.
Andrew Smith — Preceding unsigned comment added by 82.32.48.177 ( talk) 10:32, 14 December 2011 (UTC)
I teach technicians electronics and all the mathematical mumbo jumbo does not help them to obtain an understanding of the difference between emf, voltage drop & potential difference.
I teach that an "emf" is a source of electical energy which can motivate electrons around a circuit. Ie. it has to be an energy source of some sort either a battery or a power supply, a charged capacitor, the voltage produced accross an inductor when there is a changing magnetic field, a illuminated solar cell etc. Disconnect it and electrons stop moving and the circuit does not go. In a purely resistive circuit the current is always phase with the voltage
A "voltage drop" on the other hand is the voltage difference accross a load when a "current flows" through it. The current and voltage in a purely resistive the current and voltage are always 180 degrees out of phase.
A "voltage or potential difference" is the difference in voltage between any two points in a circuit, which could be an emf, a voltage drop because of a current or could include the voltage accross an "open circuit", through which no current flows at all"
Ie. In a wheatstone bridge, an "emf" is applied accross two arms each arm comprising of two resistors. A current flows through each arm producing voltage drops in each of the four resistors. A voltage difference, exists accross the open circuit between the centre points of the two arms (dependent on the balance in the bridge of course) whilst the current is 0.
As a result I use E in ohms law where I calculate the current from a power source and V where I calculate a voltage drop.
Lee de
Hi Lee, as a professional electical engineer it seems to me that the distinctions you make are entirely false and misconceived. There is absolutely no qualitative difference between a 'voltage drop', a 'voltage or potential difference' and an 'emf', and to suggest to your students that there is any difference is to mislead them completely. The fact that a voltmenter responds identically to these quantities should alert you to the possibility that they are precicely the same kind of thing. The effect that these quantities have on an electric charge (such as an electron) is also qualitatively identical; in a typical oscilloscope circuit, the electrodes of the cathode ray tube are usually connected to different points in a resistive potential-divider , and the so-say 'pd' has exactly the same effect on the electrons in the tube as a source of 'emf' would have. Perhaps the distinction that you are striving towards is that between a component which acts as an energy source (such as a voltaic cell, a charged capacitor, an inductor carrying a current, etc) and one which acts as a dissipator of energy such as a resistor. But even here you should be aware that components which act as sources of 'emf' (and of energy) can very easily become energy sinks with 'pd' simply by reversing the direction of the current. In an AC circuit a capacitor or inductor makes this change every cycle, and can do so in a DC circuit as well, depending on whether the component is being 'charged' or 'discharged'. From the point of view of circuit analysis the only useful distinction is that between components in which (at a particular instant) the current opposes the pd (energy being stored or dissipated in the device), and those in which the current is in the same direction as the pd (energy being delivered by the device). This distinction must be observed when drawing up the equations used in dc circuit analysis. Notice that this distinction is between electrical components, not between supposedly different types of voltage, which is an absurd notion. Andrew Smith — Preceding unsigned comment added by 82.32.48.177 ( talk) 12:56, 14 December 2011 (UTC)
when we connect a charged conducting sphere to the ground , what happened to the charge on the surface since the electric potential (v) on it is zero"??? —The preceding unsigned comment was added by 213.209.187.34 ( talk) 02:25, 17 December 2006 (UTC).
This article is excessively technical. While all the math is relevant in a higher-level mathematical context, to the everyday reader, this article is almost completely useless. Perhaps a section can be added which explains the concepts of electric potential in a layman's, non-multivariable way, but also with simplified, relevant mathematics. —The preceding unsigned comment was added by 199.90.6.26 ( talk) 00:11, 2 February 2007 (UTC).
cause it is electrostatics in everyday 3-d space. i agree, make a 1-d electro statics section.
Variables are not defined
134.154.242.29
15:05, 9 February 2007 (UTC)
As a student studying just starting to study this material this article is almost impossible to even approach. There should be a discussion of EP in 1 dimension then the article can go further. —Preceding unsigned comment added by 141.213.66.73 ( talk) 17:30, 17 September 2008 (UTC)
You are entirely right. I thought Wikipédia was intended to be a tool useful for as large a number of users as possible, not just to be a series of technical notes for use by higher level technicians and scientists. Ptyxs ( talk) 14:32, 7 December 2013 (UTC)
So is it a vector? The article doesn't seem to be too explicit about it. 160.227.129.254 23:07, 1 May 2007 (UTC)
Damn it. I had a test and wrongly answered it was a vector. You have failed me Wikipedia! Only kidding. But seriously, can we have that somewhere on the article? Its kind of important. Tourskin 22:20, 2 May 2007 (UTC)
Electric potential is measured in volts, while electrostatic potential [energy] is measured in joules. Why does the article say they're the same thing? Lecture 4 explains the difference (MIT OpenCourseWare). — Pengo 07:35, 31 August 2007 (UTC)
I have thought for a while that the electromagnetism template is too long. I feel it gives a better overview of the subject if all of the main topics can be seen together. I created a new template and gave an explanation on the old template talk page, however I don't think many people are watching that page.
I have modified this article to demonstrate the new template and I would appreciate people's thoughts on it: constructive criticism, arguments for or against the change, suggestions for different layouts, etc.
To see an example of a similar template style, check out Template:Thermodynamic_equations. This example expands the sublist associated with the main topic article currently being viewed, then has a separate template for each main topic once you are viewing articles within that topic. My personal preference (at least for electromagnetism) would be to remain with just one template and expand the main topic sublist for all articles associated with that topic.-- DJIndica 16:36, 6 November 2007 (UTC)
The electric potential is not a lorentz scalar, it is compontent of the 4-vector . Adiel lo ( talk) 07:39, 26 May 2008 (UTC)
To further that comment. The second sentence is factually incorrect. The electric potential is indeed not a Lorentz scalar. ( SeanH ( talk) 23:12, 1 January 2009 (UTC))
I spend most of my days on the biology articles yelling at the scientists for making the articles too complicated. Maybe I should appologize to them, because you guys are just so much worse. This article might as well have been written in a strange, obscure language. No effort has even been made to simplify the material. Paskari ( talk) 21:19, 28 August 2008 (UTC)
I'm basically trying to figure out how ions moving across the cell membrane can lead to, and alter this bizarre thing called the membrane potential. No one even explains why there is a membrane potential. I wish someone could give a simple explanation such as the concentration and type of ions lead to different electric potentials. The outside solution has more sodium ions so it's more positive.... Instead they provide weird answers such as concentration gradients lead to a voltage across the membrane. Paskari ( talk) 21:27, 28 August 2008 (UTC)
It has been known to research scientists in some branches of science, for about 60 years, that "voltage" and "electric potential" are slightly different concepts. However, this doesn't seem to have made it into some physics textbooks yet, and there is lot of confusion on this issue around. I hope no-one is going to mind, but I have removed from this article all technically inappropriate references to voltage, so that this article really does become an article on electric potential (sometimes called electrostatic potential). At the time of writing, there is a modern electron-based definition of "voltage difference" in the article on "voltage". (You can start by defining "voltage difference" to be what you measure with a voltmeter, and then ask what scientific quantity it is that you are actually measuring. Quite often it is NOT electric potential difference.) At the time of writing, there is fuller discussion of the issues in the articles on "electrochemical potential" and "Fermi level", and related links and discussion pages..
I have also removed the equations that were formulated in one of the cgs systems of equations. There was international agreement nearly 40 years ago to gradually discontinue these systems of equations, and to concentrate on the single system now used for teaching in most universities. Most current students (and, I suspect, many lecturers) do not understand that there are several possible systems of equations, and most people do not need to understand anything other than the system currently used [i.e., the (rationalized) metre-kilogramme-second-ampere system that forms the basis for SI units]. If you are one of the few that do, then you will find it easier to look this up in a well-written article elsewhere. In my experience, nowadays it simply generates confusion if we try to explain basic concepts using a near-obsolete and disused equation system. ( RGForbes ( talk) 19:52, 10 April 2009 (UTC)) Richard
'Electric potential difference' redirects here, but nowhere in this article does the words 'electric potential difference' occur. —Preceding unsigned comment added by Loldrup2 ( talk • contribs) 21:44, 25 May 2009 (UTC)
The first sentence appears to have incorrect and cumbersome grammer. Presumably the charge discused is singular and the sentence becomes cumbersome without modification- suggesting more than one possible meaning to the reader.
I agree I think it should read "...aItalic text specific point".
Nabla A-vec(r-vec,t)=-mu*J-vec(r-vec,t) sry, dont know how to write this properly. A-vec and the rest indicates a vector. mu = permeability of vacuum. Maybe we should ad this as well as a definition of electric potential. —Preceding unsigned comment added by 134.184.101.26 ( talk) 20:22, 5 October 2010 (UTC)
I find the animations are so confusing as to be completely useless. I just have no idea what's going on. It doesn't help that the text and equations are mostly unreadable, and that the captions contain no further explanation. But even if those could be fixed, the bigger problem is, they seem to be videos captured directly from applets, constructed to be played with rather than constructed to clearly visually explain an otherwise-confusing pedagogical point. Therefore I propose deleting all three animations (see now-current version of the article). What do other people think? -- Steve ( talk) 13:59, 9 August 2011 (UTC)
It seems that the electric potential is "the amount of electric potential energy" per unit charge but only for an infinitesimal charge. Often if I place a finite charge Q in some location, then the charges in nearby materials (dielectrics, conductors, etc.) will reconfigure and the electric potential will change, in a way that depends on the amount Q. In those cases the change in electric potential energy is not strictly linear in Q. I'm referring here to image charge potentials and such related things. It could be clarified by saying:
-- Nanite ( talk) 07:18, 17 July 2013 (UTC)
The Introduction section briefly talks about the concepts of forces and potential energy, and then there is this sentence: "As an object moves in the direction in which the force accelerates it its potential energy decreases".
This makes it sound like any force acting on an object will reduce its potential energy, which is wrong. If I pick up an apple, I accelerate it upwards and simultaneously increase its potential energy. Maybe "the force" in this case only refers to the force generated by the field that gives the object its potential energy, but that's not made clear, and it is probably too confusing for what's supposed to be a simple analogy. Seban678 ( talk) 09:22, 28 April 2015 (UTC)
Please note the earlier discussion of this article at Wikipedia talk:WikiProject Electrical engineering#Three articles, two concepts Oiyarbepsy ( talk) 04:09, 21 May 2015 (UTC)
What type of movement of electric charges, used for defining the electrostatic field and its circulation, can occur in an electrostatic potential, where charges are supposed not to move?-- 82.137.13.51 ( talk) 19:16, 22 October 2018 (UTC)
On section "Generalization to electrodynamics" of this article it says "When time-varying magnetic fields are present (which is true whenever there are time-varying electric fields and vice versa)". It says that if there are time-varying electric fields, then there are time-varying magnetic fields.
But as far as I know, that's not necessarily true. For example, in magnetostatics there are static magnetic fields but time-varying electric fields (because there are currents, but they're steady/DC not AC).
This mistake should be fixed. Alej27 ( talk) 12:31, 6 January 2021 (UTC)
what is \mathbf{r}' in this equation in section "Electric potential due to a point charge"
I think it would be good to make that clear to readers, it is not clear to me for example. 15:00, 21 June 2021 (UTC)
“is defined as [….] the amount of work energy needed to move a unit of electric charge from a reference point to the specific point”
So in other words “to move from A to B” right? (Any one movement is from place A to B. This is obvious.) Why this emphasis on reference point right in the beginning? This is not relativity.
Khan academy defines as “Electric potential energy is the energy that is needed to move a charge against an electric field”. Simple, although might not be 100% accurate
Physics.info defines as “The electric potential difference between two locations is the work required to move a test charge from one location to another divided by the magnitude of the test charge.” Also simple but needs more context on magnitude of test charge. Aiecon ( talk) 02:17, 18 October 2021 (UTC)
The description emphasizes electric field lines (lines perpendicular to the balls), but shouldn't the lines of constant electrical potential (the equipotential lines perpendicular to the field lines) be mentioned as well, considering that's the topic of the article? BennyWahWah ( talk) 20:32, 12 October 2022 (UTC)