Yep, that's right. the wattage is per hour. But only light bulbs run at the full wattage constantly.
http://news.cnet.com/8301-17938_105-10318727-1.html
PS3 Slim PS3 (60G, first gen)
Standby 0.36 1.22
Idling 75.19 171.35.
Blu-ray movie 80.90 172.79.
Game / idling 95.35 203.84
Game / playing 96.24 206.90.
YouTube 85.08 181.28
So playing a game on a ps3 slim at 20c per KWh costs you less then 2c per hour.
You can get simple energy meters to stick between the wall and power bar, fun to put before the amplifier and see how high you can get the wattage turning up the music :)







