watt-second

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watt-sec·ond

(wŏt′sĕk′ənd)
n. Abbr. WS or W-s
A unit of energy equal to the work done by one watt acting for one second, equivalent to 1 joule.
American Heritage® Dictionary of the English Language, Fifth Edition. Copyright © 2016 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.