You can take the free C shuttle from the airport terminal to the LAX City Bus Center. From there, you can take Metro Bus 232 all the way to the Long Beach Transit Mall. It runs every 30 minutes or less, trip takes 90 minutes. $1.25.
watt. n. Abbr. W Electricity. An SI-derived unit of power equal to one joule per second.
Electric power is the rate at which an electrical circuit transfers  electric energy. The SI unit of power is the watt which is one  joule per second. Wattage, Watts, and (W) are what power is measured in there just different ways to say watts. Watts is the term used to define a quantity of power. If you were  looking for a device used to measure power, that is called a  wattmeter.