A unit of electricity consumption of one Watt over the period of one hour.

A fluid used to absorb and transfer heat energy.

As a component of a heating or cooling appliance, rows of tubing or pipe with fins attached through which a heat transfer fluid is circulated and to deliver heat or cooling energy to a building.

Electrical energy lost due to inherent inefficiencies in an electrical transmission and distribution system under specific conditions.

The ratio of a boiler's or gasifier's maximum output to its minimum output.

The component of a central receiver solar thermal system where reflected solar energy is absorbed and converted to thermal energy.

Air that is returned from a heated or cooled space, reconditioned and/or cleaned, and returned to the space.

Defects, such as dangling bonds, induced in an amorphous silicon semiconductor upon initial exposure to light.

A hydrogen production process that process uses algae. Under certain conditions, the pigments in certain types of algae absorb solar energy. An enzyme in the cell acts as a catalyst to split water molecules. Some of the bacteria produces hydrogen after th ...

A term generally applied to individual solar collectors, and typically to solar photovoltaic collectors or modules.

Energy conversion technologies that harness the energy in tides, waves, and thermal gradients in the oceans.

Energy that comes from splitting atoms of radioactive materials, such as uranium, and which produces radioactive wastes.

The capability of doing work; different forms of energy can be converted to other forms, but the total amount of energy remains the same.

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 study of the transformation of energy from one form to another, and its practical application. (see Law(s) of Thermodynamics above).

The electrical and magnetic fields created by the presence or flow of electricity in an electrical conductor or electricity consuming appliance or motor.

A type of passive solar heating system where heat is collected in one area for use in another.

A material with high absorbtance and low emittance properties applied to or on solar absorber surfaces.

A safety device consisting of a short length of relatively fine wire, mounted in a holder or contained in a cartridge and connected as part of an electrical circuit. If the circuit source current exceeds a predetermined value, the fuse wire melts (i.e. th ...

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