The U.S. Government's 12-month financial year, from October to September, of the following calender year; e.g.: FY 1998 extends from Oct. 1, 1997 to Sept. 30, 1988.

Turbines in which the axis of the rotor's rotation is parallel to the wind stream and the ground.

The process by which water in air changes from a vapor to a liquid due to a change in temperature or pressure; occurs when water vapor reaches its dew point (condensation point); also used to express the existence of liquid water on a surface.

A term used to describe heat energy lost from a water heater tank.

A masonry or metal stack that creates a draft to bring air to a fire and to carry the gaseous byproducts of combustion safely away.

The process by which a power plant, apparatus, or building is approved for operation based on observed or measured operation that meets design specifications.

A heat exchanger that transfers heat contained in a liquid heat transfer fluid to another liquid.

The abrupt and large increase in electrical conductivity exhibited by some metals as the temperature approaches absolute zero.

A value that describes the ability of a material to conduct heat. The number of Btu that flow through 1 square foot of material, in one hour. It is the reciprocal of the R-Value (U-Value = 1/R-Value).

The production of hydrogen using a photoelectrochemical cell.

In refrigeration, an evaporating temperature of 5 degrees Fahrenheit (F), a condensing temperature of 86 degrees F., liquid temperature before expansion of 77 degrees F., and suction temperature of 12 degrees F.

The nominal voltage for which a conductor or electrical appliance is designed; the reference voltage for identification and not necessarily the precise voltage at which it operates.

In a solar photovoltaic device, an n-type dopant, such as phosphorus, that puts an additional electron into an energy level very near the conduction band; this electron is easily exited into the conduction band where it increases the electrical conductivi ...

A unit of work done by the force of one dyne acting through a distance of one centimeter.

The central heating or cooling system contains a fan that gets its air supply through these ducts, which ideally should be installed in every room of the house. The air from a room will move towards the lower pressure of the return duct.

The actual power rating that is developed by a motor before losses occur.

The duct(s) of a forced air heating/cooling system through which heated or cooled air is supplied to rooms by the action of the fan of the central heating or cooling unit.

The average time a minority carrier exists before recombination.

A large power plant that generates power for distribution to multiple customers.

A mixture of substances that has a melting point lower than that of any mixture of the same substances in other proportions.