The ONLY thing that travels at the speed of light, is LIGHT.
*Puts on The Hat of Pedantry...* That's not quite true either...
etc. etc. (Interesting paragraph though!)
And previously 'ejefrey' had said...
Firstly, of COURSE electrons actually physically flow in conductors, but maybe not in the way 'you' imagine it.
Let's first clear up thoughts of the "Speed of Light". The ONLY thing that travels at the speed of light, is LIGHT.
(And it does that at slightly varying speeds, whether through vacuum/air/diamond etc.! ). This actually has
nothing to do with the apparent 'speed' of Electricity, which is simply the result of a 'knock-on' effect within
the conductor. In say a 'Super-Conductor' situation, this knock-on effect is just a lot quicker!
This is also wrong. Speed of light has *everything* to do with the speed of "electricity" (i.e., the speed signal propagation within a circuit). Specifically it is the speed if light in the dielectric surrounding the metal. In normal situations it doesn't depend on the metal properties at all. It's the same in superconductors. This is roughly because it is light: circuit behavior is governed by electric and magnetic fields which propagate at the speed of light. The reason it depends on the speed of light specifically in the dielectric surrounding the conductors is because electric fields and high frequency magnetic fields are nearly zero inside the conductor....
Firstly, I am aware I over simplified my statement that the '
only thing at the speed of light, is light'.

However, I
was not branching into the likes of 'Radio-Waves', or 'Magnetic Pulses' etc etc. but was talking about the
real physical flow of actual Electrons, within say a conducting piece of Wire. Now can that be a complex scenario??
YES!
For example, it has been proven/demonstrated/shown & allowed for, that at much higher frequencies, MOST of the said
'current' can be within the 'outer shell' of a so-called solid 'conductor'. And as such, 'Tubes' can be as effective in many
circumstances!! However, that involves actual 'Physics' that is beyond this topic of this discussion!

Please do
not talk about apparent 'charges', or Photons/Positrons etc, and especially
NOT about 'Positive-Holes' etc which
has never had any constructive 'reasoning', except to try/(fail!) to simply accept that it is ELECTRONS that move...

Actual Electrons MOVE along a physical conductor, and in a way like I described, whether people like/understand it or not!
I fail to understand, why that simple process can not be believed/grasped/understood???