I've just heard the Black Eyed Peas track 'Rock that body' whereby Will. I. Am raps the line 'Electric shock, energy like a million Watts, space be boomin', the speakers pop'.
Now sure, he's a world famous artist and all that, but he's clearly crap at Physics because the SI unit of energy is the Joule, A Watt is a Joule per second, i.e. Power.