# What is the SI for a unit of power?

Power is measured in watts. A watt is the power that it takes to do one joule of work in one second. It can be found using the formula $P = \frac{W}{t}$. (In this formula, W stands for "work.")
Large amounts of energy can be measured in kilowatts ($1 k W = 1 \setminus \times {10}^{3} W$), megawatts ($1 M W = 1 \setminus \times {10}^{6} W$), or gigawatts ($1 G W = 1 \setminus \times {10}^{9} W$).