例文
- Direct current requires special breakers because the arc is continuous unlike an AC arc, which tends to go out on each half cycle.
- A funny difference between DC arcs and AC arcs, based on observation, at voltages above 120 V : AC hums, while DC hisses . Edison 04 : 33, 25 September 2006 ( UTC)
- The AC arc generated upon opening of the contacts will self-extinguish at the zero-crossing of the current waveform, with the vacuum preventing a re-strike of the arc across the open contacts.
