The amount of work accomplished by electrical power, usually measured in kilowatt-hours (kWh). One kWh is 1,000 Watts and is equal to 3,413 Btu.2.The energy of moving electrons.

Fuel gas with a heating value of between 200 and 300 Btu per cubic foot.

A construction element that inhibits termites from entering building foundations and walls.

The point or outdoor temperature where the heating capacity of a heat pump matches the heating requirements of a building.

The maximum load that a device is capable of carrying.

The decomposition of organic material to alcohol, methane, etc., by organisms, such as yeast or bacteria, usually in the absence of oxygen.

The measure of seasonal or annual efficiency of a heat pump operating in the heating mode. It takes into account the variations in temperature that can occur within a season and is the average number of Btu of heat delivered for every watt-hour of electri ...

A material that can be used to store thermal energy as latent heat. Various types of materials have been and are being investigated such as inorganic salts, eutectic compounds, and parrafins, for a variety of applications, including solar energy storage ( ...

A measure of the electrical resistance of a material equal to the resistance of a circuit in which the potential difference of 1 volt produces a current of 1 ampere.

A federal agency established in 1933 to develop the Tennessee river valley region of the southeastern U.S., and which is now nation's largest power producer.

The ratio of a photovoltaic cell's actual power to its power if both current and voltage were at their maxima. A key characteristic in evaluating cell performance.

A device for converting mechanical energy to electrical energy.

A refined petroleum product suitable for use as a fuel in internal combustion engines.

A battery-powered electrically driven vehicle.

The storage of heat energy during utility off-peak times at night, for use during the next day without incurring daytime peak electric rates.

The path followed by electrons from a generation source, through an electrical system, and returning to the source.

The sum of all the costs both recurring and nonrecurring, related to a product, structure, system, or service during its life span or specified time period.

A diagram that indicates the average percentage of time that the wind blows from different directions, on a monthly or annual basis.

A thermal storage wall is a south-facing wall that is glazed on the outside. Solar heat strikes the glazing and is absorbed into the wall, which conducts the heat into the room over time. The walls are at least 8 in thick. Generally, the thicker the wall, ...

A device that tracks the movement of the sun; used to orient solar concentrating systems.