Pole vaulters take no pleasure in the sudden quick jump? (4)

I believe the answer is:

volt

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'pole' is the definition.
The answer and definition can be both quantities as well as being singular nouns.
Maybe you can see a link between them that I don't see?

I don't understand the rest of the clue.

Can you help me to learn more?

(Other definitions for volt that I've seen before include "Electrical unit of measurement" , "Unit of electric force" , "Unit of electrical potential" , "little force" , "Electrical SI unit named after a pioneering Italian physicist, d. 1827" .)

I've seen this clue in the Irish Times.

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