Assertion: vibrator's contact | /r/CapableOf | interrupt the 6 or 12v direct current
Facets:
value: from the battery
type: OTHER
value: to form a stream of pulses
type: PURPOSE
Source sentences:
text: The contacts interrupt the 6 or 12V direct current from the battery to form a stream of pulses which change back and forth from 0 volts to the battery voltage, effectively generating a square wave.