Two words: quantum mechanics.
Ah and of course, you say that 'energy is in electron' is false, but with no experimental evidence; so it's your opinion, not a fact.
Here even more proof energy travels through wire's and not outside the wire in Derek's example. No that there is any evidence to the contrary but maybe one of them will make you understand this is the reality in this universe.
In the video a transient energy lights the bulb quickly because of fields. But the wires take over, otherwise there could be no light output from a DC source.
It seems this whole confusion is cause by the attempt to make it one or the other.
Does electricity flow in air or wires?
The correct answer is BOTH..
In the video a transient energy lights the bulb quickly because of fields. But the wires take over, otherwise there could be no light output from a DC source.
It seems this whole confusion is cause by the attempt to make it one or the other.
I think that's missing an important thing. No doubt we are all mostly agreed that there is some fields stuff going on before the wires are connected, but what it's really about is after that, when there is a solid wired connection. Does the energy flow in the wire, on the wire (skin) or is the wire merely a guide and the energy actually flows still in the field? As I see it, and it's sometimes tricky to remember what the argument is about, it's that last option which is the crux of the video and this discussion.
I think that's missing an important thing. No doubt we are all mostly agreed that there is some fields stuff going on before the wires are connected, but what it's really about is after that, when there is a solid wired connection. Does the energy flow in the wire, on the wire (skin) or is the wire merely a guide and the energy actually flows still in the field? As I see it, and it's sometimes tricky to remember what the argument is about, it's that last option which is the crux of the video and this discussion.
For me the question is entirely about DC and energy inside vs outside the wire. Nothing to do with switches, transmission lines, capacitors, inductors, transformer theory, antenna theory etc etc.
Hontas Farmer is back still saying the Derek is both right and wrong acording to QFT/QED
For me the question is entirely about DC and energy inside vs outside the wire. Nothing to do with switches, transmission lines, capacitors, inductors, transformer theory, antenna theory etc etc.
Ah and of course, you say that 'energy is in electron' is false, but with no experimental evidence; so it's your opinion, not a fact.
I charge two capacitors in series, to 10V (so 5V in each). While the power is still on I remove them, and put them on the bench.
They still have charge in them.
How can you tell which one was connected to 10V, and which was connected to 0V
So you're telling me wires are made of shittons of inductors and capacitors, through which the power flows, and that those inductors and capacitors -- you know, the in-circuit manifestations of fields in space -- are somehow hidden away, packed up inside a tiny hunk of metal?
Tim
For me the question is entirely about DC and energy inside vs outside the wire. Nothing to do with switches, transmission lines, capacitors, inductors, transformer theory, antenna theory etc etc.
How does sunlight get to the earth? Do you see wires connected between the sun and the earth?
Does electricity flow in air or wires?
The correct answer is BOTH..
In the video a transient energy lights the bulb quickly because of fields. But the wires take over, otherwise there could be no light output from a DC source.
It seems this whole confusion is cause by the attempt to make it one or the other.
you will see that the conductor heats uniformly on the entire conductor cross section
Quote from: electrodacusyou will see that the conductor heats uniformly on the entire conductor cross section
Easy for you to say. How about you demonstrate that?
Hontas Farmer is back still saying the Derek is both right and wrong acording to QFT/QED
QED (as all other QFTs) is a perturbation theory that extends Classical Electrodynamics to a quantum scale. QED is by no means a more fundamental theory than Classical Electrodynamics, and as being the extension, QED cannot contradict Classical Electrodynamics at macroscopic level. https://arxiv.org/pdf/1201.5536.pdf
Because QED is the perturbation theory, its approximate mathematical framework quickly falls apart when trying to describe classical systems (systems with billions of photons, electrons), as discussed in this paper: http://old.cft.edu.pl/~birula/publ/ClassLimit.pdf
In other words, QED has it own domain, and Classical Electrodynamics has its own domain. These domains do not overlap. Within their respective domains each theory has been validated experimentally to a very high degree.
In other words, to describe energy transfer in macroscopic systems proposed in Veritasium experiments, the only scientific tool Physics has is Classical Electrodynamics, and it is accurate at given scales.
Energy flows inside the wire both for AC and DC
Energy flows inside the wire both for AC and DC
Not necessarily. Take a superconductive wire at DC Inside the superconductor, electric field is zero everywhere (electric field potential is the same at any point inside the superconductor).
In other words: E = 0 inside such wire.
Electromagnetic energy flow is described by Poynting vector:
S = E x H = 0 (if E is zero vector, then its cross product is also zero vector no matter H field strength).
So no, at DC electromagnetic energy does not flow inside a superconductive wire.
If you replace superconductor with a wire that has resistance, then there will be an electric field inside the wire along its axis (equal to wire’s voltage drop divided by the length of the wire).
There is also a magnetic filed inside the wire when it conducts DC current. It can be quantified by Maxwell’s 4th equation. Such magnetic field circulates around wire’s axis. It’s strength is zero at the axis, and increases to a maximum value at wire surface.
Therefore EM energy flow inside such wire will be non zero. However the direction of the flow inside the wire will be strictly perpendicular to the wire (remember direction of E, and the fact that cross product of two vectors is perpendicular to the vectors being multiplied). The total flow at surface (surface integral S over surface of the wire) is equal to Joule heating of the wire.
Remaining EM energy flows outside the wire. Using Poynting vector formula and some math, it can be shown that the energy flown outside the wire + Joule heating is all the energy that flows out of battery. From conservation of energy principal, we can declare that there no other EM energy flows.