1 W = 1 J/s (joule/secunda)
1 C.P. (cal putere sau in engle "HP", horse-power) = 746 W = 746 J/s
Definitie:
1 HP = 33, 000 ft·lbf/min = 550 ft·lbf/s = 745.7 W.
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Joul e unitatea pentru energie
https://www.qtransform.com/ro/transforma/energie/transforma-din-joul.php