Assertion: lamp's filament | /r/HasProperty | disconnected
Facets:
Source sentences:
text: When filaments are disconnected, an inductive pulse from the ballast starts the lamp.
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.