Mercury-arc valve

Rarity: Common

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Notion

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Science and technology

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What Wikipedia says

A mercury-arc valve or mercury-vapor rectifier or (UK) mercury-arc rectifier is a type of electrical rectifier used for converting high-voltage or high-current alternating current (AC) into direct current (DC).

Excerpt from the Wikipedia article “Mercury-arc valve”, under the CC BY-SA 4.0 license. Read the article on Wikipedia

Image: PetrS., CC BY-SA 3.0, via Wikimedia Commons.