A device used to interrupt or break an electrical circuit when an overload condition exists; usually installed in the positive circuit; used to protect electrical equipment.

A federal government agency involved in rural development, marketing and regulatory programs, food safety, research, education and economics, food, nutrition and consumer service, farm and foreign agricultural services, and natural resources and environme ...

In reference to a wind energy conversion device, the area through which the rotor blades spin, as seen when directly facing the center of the rotor blades.

A device for removing heat from a gas or liquid stream for air conditioning/cooling.

A popular term used for a length of wood or steel used in or for wall framing.

A process for making inexpensive Galium Arsenide (GaAs)photovoltaic cells in which a thin film of GaAs is grown atop a thick, single-crystal GaAs (or other suitable material) substrate and then is cleaved from the substrate and incorporated into a cell, a ...

The sum of the sensible and latent heat in a substance or fluid above a base point, usually 32 degrees Fahrenheit.

An apparatus for measuring force or power, especially the power developed by a motor.

A type of insulation made from virgin basalt, an igneous rock, and spun into loose fill or a batt. It is fire resistant and helps with soundproofing.

An electric motor rated at less than one horse power (hp).

A type of power generating facility that pumps water to a storage reservoir during off-peak periods, and uses the stored water (by allowing it to fall through a hydro turbine) to generate power during peak periods. The pumping energy is typically supplied ...

A free and mobile conduction electron or hole in a semiconductor.

The energy liberated in a chemical reaction, as in the combustion of fuels.

A company that specializes in undertaking energy efficiency measures under a contractual arrangement whereby the ESCo shares the value of energy savings with their customer.

A window located high in a wall near the eaves that allows daylight into a building interior, and may be used for ventilation and solar heat gain.

An energy saving device in a heat pump that, during the cooling cycle, recycles some of the waste heat from the house to heat domestic water.

A region of electrical contact between two different materials.

A slab floor that sits directly on top of the surrounding ground.

A fluorescent lamp that has a tubular shape.

Air with a weight of 0.075 pounds per cubic foot with an equivalent density of dry air at a temperature of 86 degrees Fahrenheit and standard barometric pressure of 29.92 inches of mercury.