An electrical device that adjusts the leading current of an applied alternating current to balance the lag of the circuit to provide a high power factor.

A type of radiant heating system where the radiator is located along an exterior wall where the wall meets the floor.

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

A method of growing large size, high quality semiconductor crystal by slowly lifting a seed crystal from a molten bath of the material under careful cooling conditions.

The air external to a building or device.

An electromagnetic ballast that disconnects a lamp's electrode heating circuit once is has started; often called "low frequency electronic" ballasts.

Abbreviation for the American Society of Heating, Refrigeration, and Air-Conditioning Engineers.

In heating and cooling system distribution ductwork, the transformation pieces connecting horizontal round leaders to vertical rectangular stacks.

A measure of the electrical charge of a capacitor consisting of two plates separated by an insulating material.

A reserve appliance; for example, a standby generator for a home or commercial building.

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

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

The illuminating power of a standard candle employed as a unit for determining the illuminating quality of an illuminant.

The ratio of the average load on (or power output of) a generating unit or system to the capacity rating of the unit or system over a specified period of time.

A wall usually about 3 to 4 feet high located that is placed in the attic of a home, anchored with plates between the attic floor joists and the roof joist. Sheathing can be attached to these walls to enclose an attic space.

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

42 U.S. gallons (306 pounds of oil, or 5.78 million Btu).

A component of a electrochemical battery. A 'primary' cell consists of two dissimilar elements, known as 'electrodes,' immersed in a liquid or paste known as the 'electrolyte.' A direct current of 1-1.5 volts will be produced by this cell. A 'secondary' c ...

The component of a combustion device that regulates the amount of air entering the combustion chamber.

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 ...