In reply to:

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it can generate a looooot of voltage.

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FYI:
According to someone in the business making Tesla coils, it takes a 9 foot spark to achieve 1,000,000 volts. This figure was derived from measured quantities of x-rays generated by x-ray tubes coupled in some way to an operating Tesla coil. Similarly, a 5 foot spark represents 500,000 volts, indicating a nonlinear relationship between spark length and voltage output.

Stu