What is the SI for a unit of power?

is measured in watts. A watt is the power that it takes to do one joule of in one second. It can be found using the formula ##P = W / t##. (In this formula, W stands for "work.")

Large amounts of can be measured in kilowatts (##1 kW = 1 \times 10^3 W##), megawatts (##1 MW = 1 \times 10^6 W##), or gigawatts (##1 GW = 1 \times 10^9 W##).

The watt is named James Watt, who invented an older unit of power: the horsepower.