Uh... loaded question. IT depends on how much you plug in man.
Google 'average energy use by house' in your area... will give you a good hint.
A portable heater can use 1500W, a lightbulb (CFL) down to 13W to light a room.
Laptops are about 75-200W, PCS about 150-300W++... TV's are about 90-200W etc...