An electrochemical device that converts chemical energy directly into electricity.

The prevailing or average weather conditions of a geographic region.

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 ...

In reference to a wind turbine, a condition when the rotor stops turning.

An engine in which fuel is burned (or heat is applied) to the outside of a cylinder; a Stirling engine.

Consists of businesses that are not engaged in transportation or manufacturing or other types of industrial activities. Standard Industrial Classification (SIC) codes for commercial establishments are 50 through 87, 89, and 91 through 97.

The device in an air conditioner or heat pump through which the refrigerant is circulated and releases heat to the surroundings when a fan blows outside air over the coils. This will return the hot vapor that entered the coil into a hot liquid upon exitin ...

The average time a minority carrier exists before recombination.

A computer software program that simulates energy consumption of commercial buildings; used for design and auditing purposes.

The losses that result from inherent resistance in electrical conductors and transformation inefficiencies in distribution transformers in a transmission and distribution network.

Sensible and latent heat contained in combustion gases and vapor emitted to the atmosphere.

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.

A type of photovoltaic device in which the electricity induced in the cell is used immediately within the cell to produce a chemical, such as hydrogen, which can then be withdrawn for use.

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

A class of energy producer that produces both heat and electricity from a single fuel.

To reduce or avoid the consumption of a resource or commodity.

The total amount of electricity produced by a power plant.

A turbine that generates power from the combustion of a fuel.

A solar collector that uses reflective surfaces to concentrate sunlight onto a small area, where it is absorbed and converted to heat or, in the case of solar photovoltaic (PV) devices, into electricity. Concentrators can increase the power flux of sunlig ...

The average amount of solar radiation that reaches the earth's upper atmosphere on a surface perpendicular to the sun's rays; equal to 1353 Watts per square meter or 492 Btu per square foot.