image source = "http://www.post-gazette.com/local/region/2014/01/18/Polar-vortex-rearing-its-chilly-head-here-again/stories/201401180049"
Imagine that it is a cold weekend day in the middle of January and all your household members are staying at home for the entire weekend.
Remember that all the appliance needs electricity, even though your appliances work with gas (ex,your gas heater need electricity for blowers, which requires electricity).