Sparks
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Uploaded by paulnord on Nov 10, 2009
Two wires connected to a 120 Hz spark timer and set vertical so that they are slightly closer at the bottom form a Jacob's Ladder. The sparks jump where it is easiest for the electric field to cause a breakdown in the gas molecules of the air to form a plasma. The hot plasma rises with each consecutive spark making the next spark form at a higher location on the wire. Once high enough, the longer section of hot gas is not the best path for the current and a new spark forms where the wires are closest together.
Also notice that the potential switches signs with each other spark. It appears that some metal sputtering is taking place where the ions collide one one side of the spark. This makes that side slightly brighter.
The formation of the spark is to quick and too faint to be seen with this video at just 500 frames per second. But some of the growth and fading of the spark can be seen if you watch carefully.
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