It entirely depends. Since different models and technologies of television are not the same, they can vary greatly.
Typically, LCDs using LED backlights are the most efficient, using around 40 watts for a 30" screen.
LCDs using cold cathode, neon, and other backlights use a bit more, usually around 50-60 watts for a 30" screen.
CRTs are less efficient, using a more formidable 100-240 watts for a 30" screen.
Plasma is the least energy efficient of all, consuming a whopping 150-300 watts for a 30", although most are larger. a 42" can easily consume a kilowatt!
Unfortunately, I have no data regarding DLPs, OLEDs, CMDs, or projectors, although I know OLEDs are supposed to be more efficient than LCDs.
45 watts
Hoovers use 1000 - 2000 watts
Abut 20 watts.
650 watts
189 watts
About 10 watts
25 watts.
it may use 15 to 25 watts
Usually about 1200 to 1500 watts.
250 Watts.
they use around about 55 watts for each headlight.
3/4 of watts