Same as above: Secondary used for small Jacob's ladder.

The demonstration transformer shown in D+75+0 can be used to make a small Jacob's Ladder. A 250 turn coil is used for the primary, and a 23,000 turn coil is used for the secondary. When power is applied to the primary, the secondary coil produces about 10,000 volts (maximum current is .02 amps). A voltage this large is capable of ionizing the air between the V-shaped electrodes mounted on the secondary. The electric forces are strongest where the electrodes are closest together, at the base of the V. Thus, a spark jumps from the base of one electrode to the other, creating an arc of heated ionized glowing gases that travels upward. When the glowing arc drifts off the top of the electrodes, the circuit is broken, and the arc renews itself at the base of the electrodes. The cycle repeats.
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This a very small Jacob's ladder but it's still dangerous. Control the environment around it very carefully and keep it out of reach of the participants. As always when you present a demo make sure you ask the participants questions before you demonstrate and after. Think about the concepts involved beforehand; having a friend ask you questions about it can be very revealing as to if you understand it well or not. Whenever you ask a question count to five (or at least three) in your head waiting for an answer before you stay anything else.