A leyden jar is used to store static electricity which is very high in volts but usually low in current. and while high voltage is good you usually want a good amount of current to go with it for coil guns.
I still think in would be cool to try.
Try hooking up a few small leyden jars together in parallel this should increase current, then again big is always better (sometimes).
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question is leyden jar electricity d.c. curent If so can it be put to good use?
A Leyden jar is just static electricity but if you give static a low resistance coil it should flow at about 1000 volts that would give a large magnetic field not a more power full one but if you had a long coil gun a a huge Leyden jar it might work out.
rule of thumb the more volts the bigger the field the more current the stronger the field.
Wouldn't a high-voltage pulse through a coil have the same effect as a small EMP? Sorta like this: http://www.boingboing.net/2006/01/27/howto-turn-a-disposa.html
Or is leyden jar just static electricity or is it more like a capacitor charged and ready to discharge
yes, but the energy stored in a leyden jar is usually small.....
and insufficient for a great coilgun
it would not be practical but it probably could be done.
Potentially, yes, but you'd need a dirty great big one, far larger than any bank of normal capacitors.