On Sep 5, 5:50=A0am, 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 per
un=
it of
> > > length, why is it that more voltage will yield more current? Is it a
> > > matter of velocity of electron flow? =A0
> > Because E=3DIR which is basic Ohm's Law.
>
> That I know. =A0The question is why. =A0
>
> > > Why, for example, does one needs to use thicker wires on the low
side=
of a
> > > transformer, while on the high side, one can use thinner wires?
> > Because P=3DI^2 R and P=3DEI.
>
> That I already know. =A0
>
>
>
>
>
> > The power in and power out of a transformer (ignoring losses) are
equal=
,
> > but the voltages aren't, which is normally why one is using a
transform=
er
> > in the first place.
> > So, for a fixed amount of power, the current is higher on the low
side,
> > hence thicker wire to carry that current and less loss in the winding
> > due to I^2 R losses.
> > On the high side, keeping in mind the power is fixed, the current is
> > lower hence you don't need wire as thick as the low side.
> > > I'm not asking to be told that the resistance of the thick wire is
lo=
wer,
> > > so by applyng Ohm's law, we see that....
>
> > > Instead, I'm asking what is going on at a particle level. =A0And
> > Ohm's law works at the macro level and answers the questions.
> > Analysis at the particle level doesn't really address the questions
> > you asked.
> > > additionally, as a corollary question, I'm asking whether the
associa=
ted
> > > magnetic field propogates down the length of the wire at a greater
> > > velocity at higher voltage. =A0
> > No.
> > The magnitude of the magnetic field is a function of current.
> > The magnetic field propogates at c.
>
> I thought that electromagnetic fields propogated at C only in free
space.=
=A0
> Doesn't a wire provide significant resistance?
>
> Are you saying that low voltage electricity travels at the same velocity
> as high voltage electicity?
>
> --
> The whole problem with the world is that fools and fanatics are always
so
> certain of themselves, but wiser people so full of doubts.
> =A0 =A0 =A0 =A0 -- Bertrand Russel- Hide quoted text -
>
> - Show quoted text -
I'm wondering how one can squeeze more current through a given
diameter
wire by means of increasing the voltage
The properties of the wire itself can increase the efficiency of
electronic flow and not as much power is required to move electrons
through your wire that=92s why I suggested carbon wire due to its
molecular structure.
|
