State and define the S.I. unit of power

1. State and define the S.I. unit of power?
2. How is the unit horse power related to the S.I. unit of power?

Answer

1. watt - If 1joule of work is done in 1 second then the power spent/developed / expended is 1watt.
2. 1 H.P. = 746 W / 750 W