How many NC State engineering students does it take to replace an inefficient light bulb with an energy-efficient one?
Five: Three to design a nuclear-powered light bulb that never needs changing, one to install it, and one to write the computer program that controls the wall switch.
You are commenting as guest.
Ninety percent of the energy it takes to wash clothes is used to heat water. If you wash in cold water, you could save $40 per year if you have an electric water heater and $30 annually if you have one powered by natural gas.
Source: U.S. Dept. of Energy