High Voltage Experiment 

THIS IS VERY DANGEROUS AND COULD BE DEADLY - DO NOT BUILD THIS DEVICE. This is for education only.
This runs on 110VAC, I connected the AC hot side to one side of a 600-Watt single-pole dimmer switch, then I connected the other side of the dimmer to the HERM terminal of a motor run capacitor 45+5MFD +/-5% 370VAC, then I connected the C terminal of the run capacitor to the positive (+) side of an old style auto ignition coil.
Then the AC neutral is connected the negative (-) side of the ignition coil, then the electrical arc will be produced between the ignition coil center output and the ignition coil negative (-) side as seen in this video.