Measurement
A Watt (W) is the standard unit of power in the International System of Units (SI). One watt equals one joule per second, measuring the rate at which energy is used or generated. In practical terms, a watt is a small amount of power - a typical LED light bulb might use 9 watts, for example. In renewable energy, watts quantify the output of devices like solar panels or the consumption of electrical equipment. System sizes are often discussed in kilowatts or megawatts (thousands or millions of watts), but understanding the watt is fundamental as the building block for these larger units.