Tesla and wireless power
in [Design]
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From: Phil Hobbs on 8 Aug 2010 02:34 On 8/8/2010 2:03 AM, m II wrote: > Phil Hobbs wrote: > >> I'm not talking about Tesla _coil_ enthusiasts. They're obviously doing >> worthwhile stuff--I mean, making 20-foot sparks is at least as useful as >> blowing up anthills with dynamite, for instance. Blowing up stuff is a >> logical consequence of having testosterone, it's fun, and it's >> occasionally a life saver. > > > > My personal favourite was stuffing CO2 cartridges with wooden match > head scrapings. Not ONE of the launch attempts actually performed like > a rocket. They all blew up and grossly disfigured the angle iron > launching ramps. > > One 'trial' managed to uncurl a bit of decorative wrought iron railing > that was holding the cylinder. On a Sunday morning, 8 AM. > > The echo from the blast came back from a large building a block away. > We cleared out of there NOW! > > We were all lucky not to get killed or maimed by the shrapnel. There > seemed to be a continent wide scourge of kids getting damaged by > homemade rockets. The safe, commercially made model rockets were still > years away. > > It must have all been a billion to one odds series of events, as we > all know that testosterone has NEVER, EVER caused stupidity in male > adolescents. Female adolescents are morons too, just in a different way. Cheers Phil Hobbs (Father of some of each) -- Dr Philip C D Hobbs Principal ElectroOptical Innovations 55 Orchard Rd Briarcliff Manor NY 10510 845-480-2058 email: hobbs at electrooptical dot net http://electrooptical.net
From: Grant on 8 Aug 2010 03:28 On Sun, 08 Aug 2010 01:35:31 -0400, Phil Hobbs <pcdhSpamMeSenseless(a)electrooptical.net> wrote: >On 8/7/2010 6:09 PM, Grant wrote: >> On Sat, 07 Aug 2010 15:16:33 -0400, Phil Hobbs<pcdhSpamMeSenseless(a)electrooptical.net> wrote: >> >>> On 8/6/2010 7:31 PM, Rich Grise, Plainclothes Hippie wrote: >>>> I was just musing the other night about Tesla's AC and how it >>>> revolutionized electric wiring, with the step-up transformers and >>>> all. >>>> >>>> Well, if you start with, say, 100V, you need to carry 1 amp to power >>>> a 100W light bulb. >>>> >>>> But if you step up the 100V to 1,000V, you only need wire that can carry >>>> 100mA. >>>> >>>> And if you step it up to 1,000,000V, you only need 100 _micro_ amps. >>>> >>>> So, logically, if you could step up the voltage enough, you shouldn't >>>> need any wires at all! >>>> >>>> Unfortunately, the darned electrons arc over to stuff before they get >>>> to the destination transformer. )-; >>>> >>>> But, in fairness, those guys were just discovering electricity for the >>>> first time, and NOBODY knew anything about how it might behave. >>>> >>>> Thanks, >>>> Rich >>>> >>> >>> Tesla had an excellent excuse, but the modern Tesla enthusiasts don't. >> >> But they seem to take so much care in winding that tall secondary, >> they look quite pretty, that shiny enamelled wire cylinder. Quite >> useless, except for the Buzzt! factor long sparks ;) >>> > >I'm not talking about Tesla _coil_ enthusiasts. They're obviously doing >worthwhile stuff--I mean, making 20-foot sparks is at least as useful as >blowing up anthills with dynamite, for instance. Blowing up stuff is a >logical consequence of having testosterone, it's fun, and it's >occasionally a life saver. > >It's the wireless power transmission / over unity / extracting >continuous power from permanent magnets / loony types I'm fed up with. Reminds of a problem a friend posed recently, if one gets a large strong rare earth magnet, and hangs a heavy weight from it to a steel beam in the shed, what's doing the work of the magnet holding up that weight? Wont the magnet 'wear' out? Related, ever had an MRI? They put you in a big magnetic field, then they modulate that field to 'somehow' get images... Sound like a jackhammer, the operator side, they gave me headphones playing music to hide the noise (no metal in them, headphones had plastic tubes). This thing was built big, solid, one could feel, hear the energy thumping around. Remove all metal objects from pockets quite some distance from the room with the magnet. Grant. > >Cheers > >Phil Hobbs
From: Bert Hickman on 8 Aug 2010 11:41 Phil Hobbs wrote: > On 8/7/2010 6:09 PM, Grant wrote: >> On Sat, 07 Aug 2010 15:16:33 -0400, Phil >> Hobbs<pcdhSpamMeSenseless(a)electrooptical.net> wrote: >> >>> On 8/6/2010 7:31 PM, Rich Grise, Plainclothes Hippie wrote: >>>> I was just musing the other night about Tesla's AC and how it >>>> revolutionized electric wiring, with the step-up transformers and >>>> all. >>>> >>>> Well, if you start with, say, 100V, you need to carry 1 amp to power >>>> a 100W light bulb. >>>> >>>> But if you step up the 100V to 1,000V, you only need wire that can >>>> carry >>>> 100mA. >>>> >>>> And if you step it up to 1,000,000V, you only need 100 _micro_ amps. >>>> >>>> So, logically, if you could step up the voltage enough, you shouldn't >>>> need any wires at all! >>>> >>>> Unfortunately, the darned electrons arc over to stuff before they get >>>> to the destination transformer. )-; >>>> >>>> But, in fairness, those guys were just discovering electricity for the >>>> first time, and NOBODY knew anything about how it might behave. >>>> >>>> Thanks, >>>> Rich >>>> >>> >>> Tesla had an excellent excuse, but the modern Tesla enthusiasts don't. >> >> But they seem to take so much care in winding that tall secondary, >> they look quite pretty, that shiny enamelled wire cylinder. Quite >> useless, except for the Buzzt! factor long sparks ;) >>> > > I'm not talking about Tesla _coil_ enthusiasts. They're obviously doing > worthwhile stuff--I mean, making 20-foot sparks is at least as useful as > blowing up anthills with dynamite, for instance. Blowing up stuff is a > logical consequence of having testosterone, it's fun, and it's > occasionally a life saver. > > It's the wireless power transmission / over unity / extracting > continuous power from permanent magnets / loony types I'm fed up with. > > Cheers > > Phil Hobbs > Displays from large Tesla Coils often stimulate an interest in science and engineering in younger folks - not a bad end result... Bert -- ******************************************************************** We specialize in UNIQUE items: coins shrunk by ultra-strong magnetic fields, Captured Lightning Lichtenberg figure sculptures, and scarce technical Books. Please visit us at http://www.capturedlightning.com ********************************************************************
From: Phil Hobbs on 8 Aug 2010 12:50 On 8/8/2010 3:28 AM, Grant wrote: > On Sun, 08 Aug 2010 01:35:31 -0400, Phil Hobbs<pcdhSpamMeSenseless(a)electrooptical.net> wrote: > >> On 8/7/2010 6:09 PM, Grant wrote: >>> On Sat, 07 Aug 2010 15:16:33 -0400, Phil Hobbs<pcdhSpamMeSenseless(a)electrooptical.net> wrote: >>> >>>> On 8/6/2010 7:31 PM, Rich Grise, Plainclothes Hippie wrote: >>>>> I was just musing the other night about Tesla's AC and how it >>>>> revolutionized electric wiring, with the step-up transformers and >>>>> all. >>>>> >>>>> Well, if you start with, say, 100V, you need to carry 1 amp to power >>>>> a 100W light bulb. >>>>> >>>>> But if you step up the 100V to 1,000V, you only need wire that can carry >>>>> 100mA. >>>>> >>>>> And if you step it up to 1,000,000V, you only need 100 _micro_ amps. >>>>> >>>>> So, logically, if you could step up the voltage enough, you shouldn't >>>>> need any wires at all! >>>>> >>>>> Unfortunately, the darned electrons arc over to stuff before they get >>>>> to the destination transformer. )-; >>>>> >>>>> But, in fairness, those guys were just discovering electricity for the >>>>> first time, and NOBODY knew anything about how it might behave. >>>>> >>>>> Thanks, >>>>> Rich >>>>> >>>> >>>> Tesla had an excellent excuse, but the modern Tesla enthusiasts don't. >>> >>> But they seem to take so much care in winding that tall secondary, >>> they look quite pretty, that shiny enamelled wire cylinder. Quite >>> useless, except for the Buzzt! factor long sparks ;) >>>> >> >> I'm not talking about Tesla _coil_ enthusiasts. They're obviously doing >> worthwhile stuff--I mean, making 20-foot sparks is at least as useful as >> blowing up anthills with dynamite, for instance. Blowing up stuff is a >> logical consequence of having testosterone, it's fun, and it's >> occasionally a life saver. >> >> It's the wireless power transmission / over unity / extracting >> continuous power from permanent magnets / loony types I'm fed up with. > > > > Reminds of a problem a friend posed recently, if one gets a large > strong rare earth magnet, and hangs a heavy weight from it to a > steel beam in the shed, what's doing the work of the magnet holding > up that weight? Wont the magnet 'wear' out? > Work is force times distance. Since the weight isn't moving, no power is required. If it does come loose, the weight as it falls will do work on the magnetic field, in such a way as to account for the extra field energy of the magnet in air vs. in contact with steel, plus a bit extra for the eddy currents. Ever notice that nobody asks these questions about the electrostatic force, which is what holds solids together, including the beam, the weight, and the magnet? If the rope breaks, nobody wonders about the work done on the electrostatic field in the process, though it's mathematically similar and conceptually almost identical. People have this idea that magnetism is somehow magical and mysterious, whereas it's been a matter for calculation and not speculation for over 150 years. It is cool and sometimes counterintuitive, but not mysterious. That's where the Tesla types go wrong. Not everyone knows that sort of math, of course, but it's all the sturdy 18th and 19th Century type, not this newfangled stuff. Most folks could learn it in a year or two if they wanted to make the effort, but of course it's way easier to produce reams of blather on the Net instead. > > Related, ever had an MRI? They put you in a big magnetic field, then > they modulate that field to 'somehow' get images... Sound like a > jackhammer, the operator side, they gave me headphones playing music > to hide the noise (no metal in them, headphones had plastic tubes). > > This thing was built big, solid, one could feel, hear the energy > thumping around. Remove all metal objects from pockets quite some > distance from the room with the magnet. Yup. NMR systems for research often have glass helium dewars inside there, so that a steel bolt flying into the magnet can make a _big_ mess. Cheers Phil Hobbs -- Dr Philip C D Hobbs Principal ElectroOptical Innovations 55 Orchard Rd Briarcliff Manor NY 10510 845-480-2058 email: hobbs at electrooptical dot net http://electrooptical.net
From: Jim Thompson on 8 Aug 2010 12:53
On Sun, 08 Aug 2010 17:28:54 +1000, Grant <omg(a)grrr.id.au> wrote: [snip] > > > >Reminds of a problem a friend posed recently, if one gets a large >strong rare earth magnet, and hangs a heavy weight from it to a >steel beam in the shed, what's doing the work of the magnet holding >up that weight? Wont the magnet 'wear' out? > > >Related, ever had an MRI? They put you in a big magnetic field, then >they modulate that field to 'somehow' get images... Sound like a >jackhammer, the operator side, they gave me headphones playing music >to hide the noise (no metal in them, headphones had plastic tubes). > >This thing was built big, solid, one could feel, hear the energy >thumping around. Remove all metal objects from pockets quite some >distance from the room with the magnet. > >Grant. >> Yep. The only time I've come close to claustrophobia :-( ...Jim Thompson -- | James E.Thompson, CTO | mens | | Analog Innovations, Inc. | et | | Analog/Mixed-Signal ASIC's and Discrete Systems | manus | | Phoenix, Arizona 85048 Skype: Contacts Only | | | Voice:(480)460-2350 Fax: Available upon request | Brass Rat | | E-mail Icon at http://www.analog-innovations.com | 1962 | Spice is like a sports car... Performance only as good as the person behind the wheel. |