Knot or Watt is a UNIT of measurement used to measure the rate of energy transfer. It is equal to one joule per second and is abbreviated as kW. The term Knot or Watt is derived from the fact that one knot is equal to one nautical mile per hour, while one watt is equal to one joule per second. This UNIT of measurement is commonly used in the fields of engineering, physics, and electrical engineering.