Richard B. Gilbert wrote:
The speed of light and/or electrical signals, radio waves, etc. are *approximately* the same! The speed of an electrical signal in copper wire is slightly less than the speed of light in vacuum! It will be different again if the wires are aluminum rather than copper. If you
The signal in a cable travels (as a guided electromagnetic wave) in the gap between the conductors. The insulation material makes a lot more difference than the conductor, e.g., for coaxial cables with solid polyethylene insulation, it is about 0.67, but with foamed polyethylene it is more like 0.8. For pure air, the velocity factor is close to unity.
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