Stand-by power – energy consumed by appliances turned off but plugged in – accounts for how much of all US residential energy use?
a) 1 percent
b) 3 percent
c) 5 percent
2. For every two minutes a car idles, it uses the same amount of fuel it takes to drive
c) a mile
The California Energy Commission's Consumer Energy Center offers this rule of thumb: "If you're in a drive-through restaurant/business line or waiting for someone and you'll be parked and sitting for 10 seconds or longer, turn off your car's engine. For every two minutes a car is idling, it uses about the same amount of fuel it takes to go about one mile."