On Sep 5, 12:45=A0pm, j...@[EMAIL PROTECTED]
wrote:
> extremesoundandli...@[EMAIL PROTECTED]
<extremesoundandli...@[EMAIL PROTECTED]
> wrote:
> > On Sep 5, 10:15?am, j...@[EMAIL PROTECTED]
wrote:
> >> EskWI...@[EMAIL PROTECTED]
wrote:
> >> > In sci.physics.electromag, j...@[EMAIL PROTECTED]
wrote:
> >> >> EskWI...@[EMAIL PROTECTED]
wrote:
>
> >> >> > Ummm....using any wire of any thickness and a given resistance
pe=
r unit of
> >> >> > length, why is it that more voltage will yield more current? Is
i=
t a
> >> >> > matter of velocity of electron flow? ?
>
> >> >> Because E=3DIR which is basic Ohm's Law.
>
> >> > That I know. ?The question is why. ?
>
> >> You mean why does Ohm's Law work?
>
> >> The simple answer is you start with Maxwell and work your way into
Ohm=
..
>
> >> It was a homework problem and extended classroom discussion when I
wen=
t to
> >> school. Feel free to have the experience.
>
> >> You can't get there without math.
>
> >> >> The magnetic field propogates at c.
>
> >> > I thought that electromagnetic fields propogated at C only in free
s=
pace. ?
> >> > Doesn't a wire provide significant resistance?
>
> >> Yes, but resistance has nothing to do with the velocity of
propagation=
,
> >> that is determined by the dielectric constant.
>
> >> The velocity of propagation or velocity factor is a parameter that
> >> characterizes the speed of an electomagnetic wave through a medium.
>
> >> The VOP of free space is 1.
>
> >> The VOP of a medium is the reciprocal of the square root of the
dielec=
tric
> >> constant of the medium.
>
> >> For a bare wire in air the VOP is about 0.99 as the dielectic
constant
> >> of air is about 1.0005.
>
> >> For a wire covered with solid polyethylene the VOP is about 0.66 as
> >> the dielectric constant of polyethylene is about 2.25.
>
> >> > Are you saying that low voltage electricity travels at the same
velo=
city
> >> > as high voltage electicity?
>
> >> Yes, the velocity of propagation depends only on the dielectric
consta=
nt
> >> of the propagation medium.
>
> >> --
> >> Jim Pennino
>
> >> Remove .spam.sux to reply.
>
> > dielectric constant can vary due to tempature and pressure as well
>
> For some things, yes, but so what?
>
> The velocity of propagation depends only on the dielectric constant of
> the propagation medium, whatever the dielectric constant may be.
>
> --
> Jim Pennino
>
> Remove .spam.sux to reply.- Hide quoted text -
>
> - Show quoted text -
For some things, yes, but so what?
The velocity of propagation depends only on the dielectric constant
of
the propagation medium, whatever the dielectric constant may be
The velocity of propagation does not depend only on the dielectric
constant of
the propagation medium, whatever the dielectric constant may be if the
conditions around the medium change.
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