Unit of power equal to 1 joule per second (4)

I believe the answer is:

watt

(Other definitions for watt that I've seen before include "Engineer, coined the term horsepower, d. 1819" , "James -; Sc. engineer" , "bit of power" , "Unit of electric power" , "Work rate" .)

I've seen this clue in The Sunday Times and The Times.

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