That calculation is not the same one I'm asking for. It's not watts per hour as you've written -- it's actually watt-hours (watt * hour). The answer is also incorrect -- it's not 0.03 watts -- it's 1730 watts. So my request still stands -- show me a one-liner for my original calculation. It's not as simple as you think. ;)
Ok I did some more experimentation and discovered this: http://www.google.com/search?hl=en&ei=ePsUSs_lJ6HqtQP7l8...