General > General Technical Chat
Veritasium "How Electricity Actually Works"
electrodacus:
--- Quote from: dunkemhigh on May 11, 2022, 09:51:22 pm ---
Woah! No-one's talking resistance here (except you, as a diversion). You said "you will see that the conductor heats uniformly on the entire conductor cross section" - that is heat, thermal. I am wondering just how you can measure the internal temperature of a conductor, and you Internet isn't any help there.
So, just how do you see that? If you make a hole and place a probe you're affecting the conductor integrity, and even with a thermal imager you're only going to see the outside.
Or was this just another 'fact' or 'law' you made up on the spot?
--- End quote ---
I guess you will need to learn about another type of energy storage and that will be thermal storage.
If the electrons travel closer to the outside surface of the wire like in AC then resistive losses will show that so there will be no need to even measure the temperature.
In DC current flow the wire inductance is not relevant as magnetic field after it was created will remain constant thus no charging and discharging.
Just look at the case where I had the switch on for just 30ns vs when switch stayed ON and see the difference in energy transmission losses. All data is there for you to compare.
vad:
--- Quote from: electrodacus on May 11, 2022, 09:59:49 pm ---
So you understand that energy transfer is done by the wave of electrons. How many electrons flow from the wire/copper pipe in Derek's experiment ?
Should be very substantial and directional if you want to account for the energy transferred in the first 65ns. What about the rest ?
--- End quote ---
No. The energy is transferred from EM field to electrons.
vad:
I hope nobody argues here that oscillating EM field does carry energy. Examples are gamma rays, X-rays, UV light, visible light, microwave radiation, radio waves from terahertz to sub-hertz bands all transfer energy. Why is it so hard to realize that a constant EM field also carries energy?
electrodacus:
--- Quote from: vad on May 11, 2022, 11:15:57 pm ---
No. The energy is transferred from EM field to electrons.
--- End quote ---
Can you be more specific ?
Before the switch placed next to battery is closed there is no magnetic field just electric field that is limited to battery and will not extend out plus it is a constant not a variable field.
The switch is a small capacitor so there is also a constant electric field between the contacts of the switch. So how come you need to close the switch to transfer energy if you already have an electric field that you say can transfer energy.
When you start moving the switch contacts you are changing the capacity of the switch so you now have redistribution of charges that results in variation in electric field (not the other way around).
Say you just moved the switch contacts but you did not closed them then depending on the direction you moved them (away from each other or closer to each other) you will have a current flowing in or out of the battery and out or in of the capacitor/switch (redistributing charges).
This charge redistribution will be completed only after the time needed for the electron wave created to travel the entire loop of wire plus the time for the wave interactions to settle down and so some time after you moved the switch a small current (the one needed to redistribute charge) will flow through the lamp.
So during this charge redistribution some of the energy was lost in the wire and the lamp/resistor.
Is there something that you do not agree with?
If there is something you disagree with please provide details explanations and the equations to back up what you are saying.
You all seems to make ambiguous statements without providing any proof.
electrodacus:
--- Quote from: vad on May 11, 2022, 11:35:52 pm ---I hope nobody argues here that oscillating EM field does carry energy. Examples are gamma rays, X-rays, UV light, visible light, microwave radiation, radio waves from terahertz to sub-hertz bands all transfer energy. Why is it so hard to realize that a constant EM field also carries energy?
--- End quote ---
Magnets have a constant magnetic field so do they transfer any energy if sitting next to a copper wire ?
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