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Re: Recent power arc experiments
Original poster: "Bert Hickman by way of Terry Fritz <twftesla-at-uswest-dot-net>" <bert.hickman-at-aquila-dot-net>
The only potential problem with the NaCl solution is that electrolysis
may liberate gases which could then build up excessive pressure inside
the tube. If you can get some inexpensive CuS04 and seal the ends of the
tube with copper electrodes, it should work. If you kept the tube
vertical, it may even be possible to use a small hole on the top
electrode to allow gases to vent, in which case a dilute solution of
NaCl would probably work fine.
-- Bert --
Web Site: http://www.teslamania-dot-com
Tesla list wrote:
> Original poster: "boris petkovic by way of Terry Fritz
> --- Tesla list <tesla-at-pupman-dot-com> wrote:
> > Original poster: "Bert Hickman by way of Terry Fritz
> > <twftesla-at-uswest-dot-net>" <bert.hickman-at-aquila-dot-net>
> > Hi Boris,
> > Water resistors are made not bought... :^)
> > A water resistor is simply an insulated tube
> > containing an ionic
> > solution of water and a metal salt (usually copper
> > sulfate) capped with
> > electrodes on each end. It's sometimes called an
> > electrolytic or copper
> > sulfate resistor. These are often used in high
> > voltage and pulsed power
> > work because of their capability to absorb
> > considerable power at high
> > voltages without breakdown. It can be fabricated
> > using clear flexible
> > vinyl tubing with properly sized copper electrodes
> > sealing each end. The
> > electrolyte is simply distilled water and copper
> > sulfate - the more
> > dissolved CuSO4 or the larger the internal diameter
> > of the tubing, the
> > lower the resistance, and total resistance simply
> > scales linearly with
> > length.
> > When current flows through the resistor, copper is
> > simply electroplated
> > from the anode to the cathode with little, if any,
> > evolution of gas at
> > the electrodes. Because of the excellent thermal
> > capacity of water, it
> > can absorb huge amounts of pulsed power safely and
> > predictably. I was
> > originally going to water resistors as charging and
> > bleeder resistors on
> > the Quarter Shrinker before I found a batch of 20k
> > 225 watt power
> > resistors at the local recycling center (dump!).
> > Some difficulties with
> > using these: the resistance will slowly change over
> > time as ions leach
> > from the electrodes, and (in unheated labs) they may
> > tend to freeze
> > during the winter in northern climates.
> > Jim Lux has an excellent article proving specific
> > design information for
> > these at his site:
> > http://home.earthlink-dot-net/~jimlux/hv/rwater.htm
> > -- Bert --
> > --
> Personally,I have small diameter-d=5mm ,but long glass
> tube(dating since my early scientific and boy's
> chemicist days).
> Could this be good in combination with destilated
> watter and small amounts of NaCl powder?
> Thanks,for the link.I'll take a look at it.
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