Assertion: lamp's arc | /r/HasProperty | struck
Facets:
value: by touching the rod tips
type: MANNER
Source sentences:
text: The electric arc is struck by touching the rod tips then separating them.
text: After the arc is struck, the internal resistance of the lamp drops to a low level, and the ballast limits the current to the operating current.
text: In this design, the incandescent filament heats the mercury, producing a vapor which eventually allows an arc to be struck, short circuiting the incandescent filament.
text: Fluorescent lamps, however, use electrodes inside the bulb to strike the arc and initiate the flow of current - each time the arc is struck, the electrodes degrade a little, eventually causing the lamp to flicker and then fail.
text: This technique uses a combination filament–cathode at each end of the lamp in conjunction with a mechanical or automatic (bi-metallic) switch (see circuit diagram to the right) that initially connect the filaments in series with the ballast to preheat them; when the arc is struck the filaments are disconnected.