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## Main Question or Discussion Point

How can I safely produce an electric arc, preferably multiple centimetres long, the longer the better, out of some basic stuff like a transformer and a motorbike battery?

I would like to produce an electric arc that is clearly visible, and that isn't dangerous, so the amperage should be quite low, as I'm not looking for heaps of power, but the length.

Also, how do you calculate the amount of voltage required to produce an arc of a given length?

I would like to produce an electric arc that is clearly visible, and that isn't dangerous, so the amperage should be quite low, as I'm not looking for heaps of power, but the length.

Also, how do you calculate the amount of voltage required to produce an arc of a given length?