The SI unit of watt (W) is a derived unit used to measure power. It is defined as one joule per second (1 W = 1 J/s).
In simpler terms, a watt represents the rate at which energy is used or transferred. If you have a device that uses one joule of energy every second, it is consuming one watt of power.
So, the SI unit for watt is simply **joule per second (J/s)**.