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"Veritasium" (YT) - "The Big Misconception About Electricity" ?

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dannybeckett:
Agh sorry for the dumb question, thanks all for explaining :D

SandyCox:

--- Quote from: aetherist on February 21, 2022, 12:24:24 pm ---
--- Quote from: SandyCox on February 21, 2022, 11:42:52 am ---24mm/80ps = 3e8m/s  :palm:

--- End quote ---
Yes 1000 mm in 3.3 ns is the same as 1 mm in 3.3 ps which is the same as 24 mm in 80 ps.
And the speed of light here is the speed of light in air. The little bit of poly on the pair of wires (ladder antenna cable) would only add say 1 mm at 2c/3, not worth mentioning.
Actually i did measure it to be 85 ps rather than Howard's 79 ps.

--- End quote ---
So what's your point? The speed of light = The speed of light?

adx:

--- Quote from: dannybeckett on February 21, 2022, 12:43:28 pm ---Agh sorry for the dumb question, thanks all for explaining :D

--- End quote ---
Yes, I think the 1/c was to show that the answer is the speed of light whatever the spacing, rather than a fixed 3.3ns for 1m. Or physicists dropping the distance unit because the amount is 1 and 1/c is a correct answer anyway. Engineers would never do this because 1/c is a useless number and they use units as a mental crutch to make sure they got even the most basic equation right. Physicists don't make mistakes, but if they did it wouldn't matter. (rhetorical :popcorn: because no one replies when it's true)

https://en.wikipedia.org/wiki/Speed_of_gravity
"...between -3×10-15 and +7×10-16 times the speed of light"

No bites on the laserpointer thing yet.

SilverSolder:

--- Quote from: adx on February 21, 2022, 02:30:38 pm ---[...]
No bites on the laserpointer thing yet.

--- End quote ---

OK let's go there...    The beam would curve, like the water coming out of a rapidly swung garden hose...   the speed never changes!

penfold:

--- Quote from: aetherist on February 21, 2022, 12:24:24 pm ---
--- Quote from: SandyCox on February 21, 2022, 11:42:52 am ---24mm/80ps = 3e8m/s  :palm:

--- End quote ---
Yes 1000 mm in 3.3 ns is the same as 1 mm in 3.3 ps which is the same as 24 mm in 80 ps.
And the speed of light here is the speed of light in air. The little bit of poly on the pair of wires (ladder antenna cable) would only add say 1 mm at 2c/3, not worth mentioning.
Actually i did measure it to be 85 ps rather than Howard's 79 ps.

--- End quote ---

Do you have any coments on the measurement uncertainty in that number?

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