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2. Energy factor - Wikipedia

   en.wikipedia.org/wiki/Energy_factor

   The energy factor metric only applies to residential water heaters, which are currently defined by fuel, type, and input capacity. [5] Generally, the EF number represents the thermal efficiency of the water heater as a percentage, since it is an average of the ratio of the theoretical heat required to raise the temperature of water drawn to the amount of energy actually consumed by the water ...

3. Home appliance - Wikipedia

   en.wikipedia.org/wiki/Home_appliance

   While many appliances have existed for centuries, the self-contained electric or gas powered appliances are a uniquely American innovation that emerged in the early twentieth century. The development of these appliances is tied to the disappearance of full-time domestic servants and the desire to reduce the time-consuming activities in pursuit ...

4. Hand dryer - Wikipedia

   en.wikipedia.org/wiki/Hand_dryer

   Electric hand dryer example - Dyson Airblade. A hand dryer is an electric machine which might make use of a heating element and an air blower to dry the hands after hand washing. It is commonly used in public toilets as a cost-effective alternative to paper towels. It may either operate with the push of a button or automatically using a sensor.

5. We compared gas vs. electric stoves in our L.A. test kitchen ...

   www.aol.com/news/gas-stoves-phase-tested-flame...

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6. Gas vs. Electric Cars: Pros and Cons of Each - AOL

   www.aol.com/gas-vs-electric-cars-pros-170000149.html

   Advantages of an Electric Vehicle EVs have a battery that feeds at least one electric motor that sends torque to the wheels. Like the gas tank on an internal-combustion car, the battery pack ...

7. Cost of electricity by source - Wikipedia

   en.wikipedia.org/wiki/Cost_of_electricity_by_source

   The levelized cost of electricity (LCOE) is a metric that attempts to compare the costs of different methods of electricity generation consistently. Though LCOE is often presented as the minimum constant price at which electricity must be sold to break even over the lifetime of the project, such a cost analysis requires assumptions about the value of various non-financial costs (environmental ...