I should have read more carefully before replying. Are you (Michael) responding to the electron speed or the signal speed. The signal travels much faster than an individual electron. The analogy I read was to think of a tube filled with marbles moving through it. A marble drops out of the end much faster than it takes for one marble to traverse the entire tube.
Will On 4 Nov 2024, at 12:09, Stephen M. Butler <kg...@arrl.net> wrote: On 11/4/24 08:26, William Prescott wrote: > Electrons move very slowly in copper, about 1 cm/sec. The question is the > signal speed in copper, which is about half the speed of light. I got this > from a couple I think you are missing a decimal point and a few zeros between said point and the 1. The velocity factor of wire is between 0.80 - 0.95. (80-95%)That implies a slowdown of 5-20% -- not the near 100% that would get to 1 cm/sec. Taking the 80% factor and the 11.8" calculated below would give a length around 9" -- which is the length I remember getting when attending a lecture for (then) Capt Grace Hopper. > On 4 Nov 2024, at 10:00, Michael or Penny Novack via > gnucash-user<gnucash-user@gnucash.org> wrote: > > On 11/4/2024 10:45 AM, Robert Heller wrote: >> The Speed of Light = 299 792 458 m / s >> Nano =0^-9 >> >> 299792458 * 10^-9 =2997924580m = 29.9792458000cm = 11.8028526771in >> > Excuse me, but that is in a vacuum. Would be slower in some other medium > (like that length of fiber). And while electrons can approach the speed of > light in a vacuum, they move slower in that copper wire. > > For example, the reason a prism bends light is that the speed of light in > glass is lower than in air. > > Michael D Novack > > > _______________________________________________ > gnucash-user mailing list > gnucash-user@gnucash.org > To update your subscription preferences or to unsubscribe: > https://lists.gnucash.org/mailman/listinfo/gnucash-user > ----- > Please remember to CC this list on all your replies. > You can do this by using Reply-To-List or Reply-All. > > _______________________________________________ > gnucash-user mailing list > gnucash-user@gnucash.org > To update your subscription preferences or to unsubscribe: > https://lists.gnucash.org/mailman/listinfo/gnucash-user > ----- > Please remember to CC this list on all your replies. > You can do this by using Reply-To-List or Reply-All. _______________________________________________ gnucash-user mailing list gnucash-user@gnucash.org <mailto:gnucash-user@gnucash.org> To update your subscription preferences or to unsubscribe: https://lists.gnucash.org/mailman/listinfo/gnucash-user ----- Please remember to CC this list on all your replies. You can do this by using Reply-To-List or Reply-All. _______________________________________________ gnucash-user mailing list gnucash-user@gnucash.org To update your subscription preferences or to unsubscribe: https://lists.gnucash.org/mailman/listinfo/gnucash-user ----- Please remember to CC this list on all your replies. You can do this by using Reply-To-List or Reply-All.
