A passive or mechanical device used to ventilate an attic space, primarily to reduce heat buildup and moisture condensation.

A device for converting one form of energy or fuel into useful energy or work.

An electrical conductor that serves as a common connection for two or more electrical circuits; may be in the form of rigid bars or stranded conductors or cables.

The power conduit of an electric power plant; the starting point of the electric transmission system.

A graph that indicates the distribution of wind speeds as a function of the cumulative number of hours that the wind speed exceeds a given wind speed in a year.

A thin coating of a material applied to a photovoltaic cell surface that reduces the light reflection and increases light transmission.

Primitive plants, usually aquatic, capable of synthesizing their own food by photosynthesis.

The temperature of a medium, such as gas or liquid, which comes into contact with or surrounds an apparatus or building element.

A device, such as a steel plate, used to check, retard, or divert a flow of a material.

In reference to solar energy systems, the angle at which direct sunlight strikes a surface; the angle between the direction of the sun and the perpindicular to the surface. Sunlight with an incident angle of 90 degrees tends to be absorbed, while lower an ...

The usually unfinished space above a ceiling and below a roof.

An air pollution control device that removes organic contaminants by oxidizing them into carbon dioxide and water through a chemical reaction using a catalysis, which is a substance that increases (or decreases) the rate of a chemical reaction without bei ...

A standard unit of electrical power equal to one thousand watts, or to the energy consumption at a rate of 1000 Joules per second.

The action of light on a biological system that results in the dissociation of a substrate, usually water, to produce hydrogen.

The temperature at which a material ignites.

The demand on, or the power output of, an electrical system or any of its parts over an interval of time, as determined by the total number of kilowatt-hours divided by the units of time in the interval.

A unit of measure for an electrical current; the amount of current that flows in a circuit at an electromotive force of one Volt and at a resistance of one Ohm. Abbreviated as amp.

A quantity of (solid) biomass fuel equal to 2,400 pounds bone dry.

A region of transition between semiconductor layers, such as a p/n junction, which goes from a region that has a high concentration of acceptors (p-type) to one that has a high concentration of donors (n-type).

A system that records the consumption of electricity, gas, water, etc, and sends the data to a central data accumulation device.