what is voltage?
What is voltage?
Ryan Stewart
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Brayden Howard
A force that makes charges such as electrons to move in a certain direction.
Elijah Jones
The "force" or "relative pressure" (in Volts) that interacts with the internal resistance of the conductor (in Ohms) to allow a quantity of eletrons per time unit to pass through the conductor (in Amps).
Did I made it, Veeky Forums?
Blake Walker
Describing voltage as a 'force' is a misnomer - it doesn't have units of force. That's an analogy used to teach people about electricity within the context of water and pipes and such.
The force delivered to a charge sitting at a specific voltage potential depends on the charge. Double the charge and the force doubles. It's more appropriate to describe voltage as electric potential energy, rather than a 'force'.
Levi Torres
current is not electrons per time. common misconception. it's charge per time which travels through a medium such as the electron sea of metals. electrons themselves move at an extremely low "drift velocity" in DC, (millimeters per hour) and do not move in a net direction in AC (they vibrate)
Nathan Richardson
>current is not electrons per time. common misconception. it's charge per time which travels through a medium such as the electron sea of metals
These are literally the exact same thing though, just with different scaling factors
Camden Jenkins
While it is more accurate, it is by far more complicated.
I would say the middle ground is to compare voltage with gravitational pull, similar to acceleration. Just that instead of mass, you have charge.
Matthew Adams
no nigga, electrons actually move very slightly in the opposite direction when an electric field is applied. movement of charge is what is "electricity"
Wyatt Gonzalez
>electrons actually move very slightly in the opposite direction when an electric field is applied
In the opposite direction to where the force is applied? Source me brochacho
Joshua Baker
en.wikipedia.org
and heres a gif i found of how electric charge moves through electrons (simplified a lot). When you flip on the light, the CHARGE moves instantly to power it, not the electrons. the electrons move very, very slowly in fact, and in random directions but with a net effect away from the field. see wikipedia article.
Josiah Jackson
Container A has N electrons.
Container B has M electrons.
The voltage of A over B is N-M.
Voltage determines the movement of electrons; electrons will always and only move to directions that decrease total voltage of the system.
Example
Container A has 5 electrons
Container B has 3 electrons
Voltage of A over B is 2 "Volts" (1 volt is actually many many electrons, 6*10^18 or something)
When time passes, containers will reach state with container A having 4 electrons and container B having 4 electrons (that is, zero voltage).
Jack Lopez
...
Nathaniel Ortiz
Voltage is the difference in electric potential between two points in an electric field. Electric potential at a point is the electric potential energy experienced by one coulomb of charge at that point in the electric field.
Leo James
>what is voltage?
electrical "Pressure"
Colton Foster
Thanks for reminding me this.
Why are eletrons still considered to be the "negative" force anyway?
David Smith
>Why are eletrons still considered to be the "negative" force anyway?
they aren't considered a negative force, they have a negative charge...
it's a fairly arbitrary distinction.
Andrew Rivera
A unit of measurement.
/thread
Anthony Parker
Voltage is actually a change in magnetic flux d.. er, lets do it this way because everyone is spewing bullshit.
Brayden Rivera
Literally the only accurate answers in a sea of inane, flat-out wrong or engineer's "muh voltage is pressure" bullshit. Disappointed in Veeky Forums, desu. For all your chattering over intelligence and IQ tests, you fail to answer very simple questions about introductory material.
I genuinely think that's a p cool suggestion user, but that definition of voltage does not account for those electric fields not generated in accordance Faraday's law (e.g. electric fields generated by a static distribution of charges), no?
Juan Hernandez
I always try to draw analogies to mechanics since this is what our monkey brains were made for to understand
The equation for energy of particle moving in an electric field is: W = q U
The mechanical equivalent is: W = F_m * s = s * m * a_m,
(where F_m is the "average" Force over a distance s)
Intuitively the equivalent of charge here is mass, if we remove that and look at what is left we see that voltage equals an acceleration over some distance
An intuitive analogue would be height difference since that is a pure acceleration over the difference
Logan Brown
voltage is a measure of potential energy
Xavier White
Its just an alternative descprition of electric interaction. Voltage itself has no meaning, its differenece in voltage that which tells you there is an electric field. Its a mathenatical construct that has the property of encoding the same information as knowing the electeic field. It has to do with the fact that electric fields are irrotational or of curl 0 which (considering an appropiate domain) permits you construct a scalar field whose gradient is the electric field.
This is a bit misleading, but yea.
Gabriel Myers
>This is a bit misleading, but yea.
you're right partly. I was wrong in my definition.
voltage is a measure of differences in potential energy, at least colloquially.
I think we can agree on this.
Andrew Bell
Well, just by dimensional analysis thats not completley true, its potentiak energy ber unit charge.
Evan Perez
>That link
Benjamin Howard
what is shilling?
Ryan Reed
>using the same symbol to represent mass and as an index
why do physicists suck at notation
Evan Diaz
Difference in potential energy per unit of charge
It's that easy
Dominic Thomas
shilling is what shilltards do
when they can't do anything else.
Joseph Ramirez
Engineer here. Voltage is, essentially, the difference in charge between two points. This difference in charge is what causes the movement of charge in a system; the system is seeking its lowest potential energy state, which is neutral charge throughout.
Justin Cruz
The energy difference that 1C of charge would get moving from the + to the -
Christopher Mitchell
Basically what pressure is in water pipes
Sebastian Hughes
Electrons move slowly down a wire
The belief: the electrons move lightning fast down a wire.
the hypercorrection: in the completely obsolete Drude model, electrons move slowly. In this model, you imagine the current is carried by a classical gas of electrons, and you divide the total current by the density of all electronic charge to get the drift velocity. This predicts a completely bogus drift velocity of a few cm/s, which is total nonsense, because only electrons near the Fermi surface contribute to the conductivity. Nevertheless, you see this hypercorrection repeated endlessly (it appears here too).
The best answer: the electronic wavefunctions are spread out in a metal. The correct notion of electron velocity is the Fermi velocity, which is enormous typically, because the wavelength is about 1 atomic radius. While it isn't the same as the speed of electricity going down the wire (which is the speed of the field perturbations, some significant fraction of the speed of light), it is enormously high. Impurities which can scatter electrons will alter this speed, but not as much as the naive hypercorrection says.
physics.stackexchange.com
Leo Peterson
sage this shilltard shit