What is the SI unit of power?

Watt

Power is defined as the rate of doing work or the rate of transfer of energy. If an agent does a work W in time t, then power is given by:

Power = \(\frac{work}{time}\)

The SI unit of power is watt [in honour of James Watt (1736 – 1819)] having the symbol W.

1 watt is the power of an agent, which does work at the rate of 1 joule per second.