Microorganisms that live in oxygen deprived environments.

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

The amount of electromotive force, measured in volts, that exists between two points.

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

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

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

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 ...

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 ...

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

A type of heating fuel derived by refining crude oil that has a boiling range at atmospheric pressure from 400 degrees to 550 degrees F.

A process for carrying out a reaction in which the reactants are fed in discrete and successive charges.

A type of electrical current, the direction of which is reversed at regular intervals or cycles; in the U.S. the standard is 120 reversals or 60 cycles per second; typically abbreviated as AC.

The number of degrees per day that the daily average temperature (the mean of the maximum and minimum recorded temperatures) is below a base temperature, usually 65 degrees Fahrenheit, unless otherwise specified; used to determine indoor space heating req ...

A measure of the flow of current (in amperes) over one hour.

The amount of heat required to raise the temperature of one pound of water one degree Fahrenheit; equal to 252 calories.

The temperature at which a material ignites.

The measure of seasonal or annual efficiency of a residential heating furnace or boiler. It takes into account the cyclic on/off operation and associated energy losses of the heating unit as it responds to changes in the load, which in turn is affected by ...