I know that in quartz watches a quartz crystal is used to keep time by counting it's vibrations, caused by the voltage applied to it.
I don't understand if this voltage is DC or AC:
If DC is used, why does the quartz oscillate instead of changing position permanently?
If AC is used, doesn't he quartz oscillator have to oscillate at the same frequency as the AC? If so, then there's no need for the mechanical transducer.
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