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*To*: tesla@xxxxxxxxxx*Subject*: Re: Light emission*From*: "Tesla list" <tesla@xxxxxxxxxx>*Date*: Thu, 11 May 2006 14:42:10 -0600*Delivered-to*: testla@xxxxxxxxxx*Delivered-to*: tesla@xxxxxxxxxx*Old-return-path*: <vardan01@xxxxxxxxxxxxxxxxxxxxxxx>*Resent-date*: Thu, 11 May 2006 14:27:52 -0600 (MDT)*Resent-from*: tesla@xxxxxxxxxx*Resent-message-id*: <TaKvIJytIWH.A.HOD.I55YEB@chip1>*Resent-sender*: tesla-request@xxxxxxxxxx

Original poster: Jim Lux <jimlux@xxxxxxxxxxxxx> At 05:57 AM 5/11/2006, you wrote:

Original poster: "Langer Giv'r" <transworldsnowboarding19@xxxxxxxxxxx>Hello, does an electrical arc give off light not only because ofphoton emission, but also due to blackbody radiation?Thanks for the advice!

The constant is 5.67E-8 W/(m^2 K^4), so we can calculate approximate values: Lets assume the arc is a cylinder 1 cm long, and 1mm in diameter and at 7000K. W = 5.67E-8 * Area * (Thot^4-Tcold^4) Area = 0.01 * 0.00314 = 0.000314 m^2 = 3.14E-4 m^2 Assume Tcold = 0 (to make numbers easy) Thot^4 = 7E3^4 = approx 2500E12

(5.67 * 3.14 * .25 is about 6*3/4 = 4.5) Check for resonableness.. 20 kV peak voltage on primary, with gap of, say, 1 cm

Daniel

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