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*To*: tesla-at-pupman-dot-com*Subject*: Re: SSTC does 10 foot sparks*From*: "Tesla list" <tesla-at-pupman-dot-com>*Date*: Thu, 24 Jun 2004 09:01:26 -0600*Resent-Date*: Thu, 24 Jun 2004 09:05:02 -0600*Resent-From*: tesla-at-pupman-dot-com*Resent-Message-ID*: <pQGfqC.A.cGE.c2u2AB-at-poodle>*Resent-Sender*: tesla-request-at-pupman-dot-com

Original poster: "Malcolm Watts" <m.j.watts-at-massey.ac.nz> Hi Matt, Below I'll give two clear examples of why I left energy considerations behind in the dust wrt TCs: On 23 Jun 2004, at 22:46, Tesla list wrote: > Original poster: Mddeming-at-aol-dot-com > > In a message dated 6/23/04 11:33:27 PM Eastern Daylight Time, > tesla-at-pupman-dot-com writes: > > Giving an efficiency in power makes perfect sense. Most devices are > rated in this way. A motor has a certain electrical power in, and a > certain mechanical power output. The efficiency is defined as > Mechanical power out / electrical power in. A heater, lightbulb, and > many other devices can be given an efficiency rating the same way! > What doesn't make sense is to say we have a motor which has a certain > power output, and then try to calculate the energy output by lifting a > mass, or some other means and at the same time monitoring the input > power and integrating - much more of a pain, and will arrive at > (approximately, due to measurement error) the same result. > > > > Hi Sean, > Power makes sense for the devices you cite, but only because they are > fairly constant and continuous power-in, power-out devices with a load > that can be held constant during testing. None of this applies to a > Tesla coil. The input and output occur at different times, are of > different durations, different waveforms, different frequencies. In > this case, a good argument for energy measurement can be made. > > Matt D. 40J (for example) can give a totally different sparklength under the following situations: #1 - a single shot of 40J into cold air vs a shot of 40J into a hot, well-established streamer path #2 - 40J under either situation coming from substantially different secondary coils, i.e. the L/C ratios and hence output voltages for one thing being totally different. Malcolm

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