Even a vacuum can undergo a kind of breakdown, however in this case the breakdown or vacuum arc involves charges ejected from the floor of metal electrodes moderately than produced by the vacuum itself.
To accomplish this the floor is moulded right into a series of corrugations or concentric disc shapes. Many [low voltage power line](https://hottips.click/blog/cap-dien-luc-ha-the-cvv-0-6-1kv-tcvn-5935-cau-tao-ung-dung-va-nhung-dieu-can-biet/ "low voltage power line") supplies use a couple of regulating technique in sequence.
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