11. An electric spark is usually generated once per turn of the knob or press of the button. 12. Revelers in the Ozone Disco Pub saw electric sparks and smoke moments before the disco went pitch black. 13. Combustible gas, mixed with air, is supplied into the combustion chamber and then fired by an electric spark . 14. A food is placed into this device and is ignited by an electric spark to burn the food. 15. Revelers in the packed Ozone Disco Pub saw electric sparks and smoke moments before the disco went pitch black. 16. They also can shoot electric sparks from their eyes, which is how you can tell them apart from politicians. 17. In a second re-enactment, they spilled gasoline in a Saab, tipped it into the ditch and created electric sparks . 18. To strike the welding arc, a high frequency generator ( similar to a Tesla coil ) provides an electric spark . 19. Flame igniters use electric sparks to initiate combustion in some furnaces and gas stoves in place of a pilot flame. 20. Electric sparks require a field strength above approximately 40 kV / cm in air, as notably occurs in lightning strikes.
