Re: How to build a Tesla Tower and free energy

["Tesla list" <tesla-at-pupman-dot-com>]

Original poster: "by way of Terry Fritz <teslalist-at-qwest-dot-net>" <dhmccauley-at-spacecatlighting-dot-com>


Yeah, I'm not sure if its true, but possibly one of those urban myths thrown
about by engineers over the ages.
Anyways, the lengths of wire told in these tall tales was on the order of
many miles.  I'm sure everytime the story was told
though that the distance increased!!!!

Dan


 > Nice story, but if you run the math, you can't get a lot of power... We
 > looked into this to get small amounts of power to run a beacon
 > transmitter.  I doubt you could get kilowatts with any practical setup..
 >
 > It's hard enough to couple significant power from the primary to the
 > secondary of a TC, and they're inches apart.
 >
 >
 >
 > Consider
 > 1)  The fields from the wires in the HV transmission line cancel to some
 > degree, especially by the time you get to ground level.  Not perfectly, of
 > course, which is why they rotate the phase conductors in the line
periodically.
 >
 > 2) What couples is the magnetic field, which is proportional to current,
 > which, of course, isn't all that high in those line (say, 1000 Amps?),
even
 > though it may be Gigawatts of power flowing.. The infamous Path 15 in
 > California runs at 500kV, and carries about 2400 MW, planned to be
upgraded
 > to 3900 MW, although the usual load is more like 1 GW.. 1 GW is only about
 > 700 Amps in each conductor
 >
 > So, let's run a quick calculation, ignoring the field cancellation from
the
 > other conductors....
 >
 > Let's assume a current of 1000 Amps, carried in an infinitely long
 > conductor 10 meters away... Biot-Savart/Ampere gives B =
mu0*I/(2*pi*dist),
 > where mu0 = 4*pi*1E-7...
 > = 2* 1E-4/10 = 2E-5 Tesla  (for comparison, the Earth's magnetic field is
 > about 50-100 microTesla)
 >
 > Now, from Faraday's law, we can calculate the voltage induced in a
 > conductor immersed in that 20 microTesla (RMS) field. E= pi*f*B*r*l.. For
 > 60Hz, 20 microT, 2 cm diam, and 1 meter long, we get 3.14*60*2E-5*1E-2
V/m,
 > or 37.7E-6 V/m ... This is not a huge voltage.. even a 100 meter long
 > parallel wire will only have a voltage of 3.8 mV across it. That same 100
 > meter wire will have a series impedance of a few ohms, so we could extract
 > a few microwatts of power (maybe 3-4 mV at a mA or so).  Lots of power
 > feeding into a radio receiver front end designed to measure femtowatts,
but
 > hardly enough to light a lightbulb.
 >
 >
 > For those who need a practical demonstration... One can set up a scale
model...
 >
 >
 > String a single wire going to a lightbulb or some other 100-1000 watt
load,
 > with the return some distance away.  Powering this from the 110V wall
 > socket, it will be somewhere around 1-10 Amps flowing in the wire.  Now
 > arrange a 1 meter long wire just a meter away, and see how much power you
 > can extract from that wire.
 >
 >
 > If one wanted to extract power from the overhead transmission lines,
 > capacitive coupling might actually be a better way.  Consider two 100
meter
 > long wires, 1 cm in diameter, separated by 10 meters.  The capacitance is
 > on the order of A/d*epsilon0 = (100*.01/10)*9 pF or 1 pF... At 60 Hz, the
 > impedance would be 1/(377*1E-12) ohms, or about 3E9 ohms, which sounds
like
 > a lot.. but, the voltage across that capacitor is about 500 kV, so the
 > current is E/R = 5E5/3E9, 1.7E-4 Amps... 0.17mA..More than enough to
power,
 > oh, say, one of those LCD clocks.
 > At 11:53 AM 6/2/2003 -0600, you wrote:
 > >Original poster: "Mccauley, Daniel H by way of Terry Fritz
 > ><teslalist-at-qwest-dot-net>" <daniel.h.mccauley-at-lmco-dot-com>
 > >
 > >
 > >Or you can do what quite a few people do, typically people out in the
 > >boondocks in the middle of nowhere.
 > >They'll string a second line of wire right next to the high voltage power
 > >line and through coupling as well, get
 > >enough power to run their home etc... The line lengths must be relatively
 > >long, but it works.
 > >
 > >"Now who said there was no such thing as free energy!!!"
 > >
 > >The Captain
 > >
 > >
 > >
 > >
 > > > Ron: Your request opens a big door for responses. Very few
 > > > people have done
 > > > any work with free power. I suggest you start small with
 > > > charging a battery
 > > > off of a long wire antenna ,300 ft or so, then build larger
 > > > projects with
 > > > tuned circuits as you learn.
 > > > --       Robert  H
 > > >
 > > >            --- Original Message -----
 > > > From: Tesla list <tesla-at-pupman-dot-com>
 > > > To: <tesla-at-pupman-dot-com>
 > > > Sent: Sunday, June 01, 2003 6:21 PM
 > > > Subject: How to build a Tesla Tower
 > > >
 > > >
 > > >  > Original poster: "Ron McCamey by way of Terry Fritz
 > > > <teslalist-at-qwest-dot-net>"
 > > > <tsalmon15-at-msn-dot-com>
 > > >  >
 > > >  > I am a novice to knowing things about electricity, however
 > > > I would like to
 > > >  > build a testla tower to extract free energy from the air.
 > > > Any sugguested
 > > >  > learning resources?
 > > >  >
 > > >  >
 > > >
 > > >
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