A way of joining photovoltaic cells by connecting positive leads to negative leads; such a configuration increases the voltage.

An idealized process in which a working fluid (water, air, ammonia, etc) successively changes its state (from a liquid to a gas and back to a liquid) for the purpose of producing useful work or energy, or transferring energy.

This is an independent regulatory agency within the U.S. DOE that has jurisdiction over interstate electricity sales, wholesale electric rates, natural gas pricing, oil pipeline rates, and gas pipeline certification. It also licenses and inspects private, ...

The concept of capturing and converting the energy available in the motion of ocean waves to energy.

The path followed by electrons from a generation source, through an electrical system, and returning to the source.

The process of breaking down organic material; reduction of the net energy level and change in physical and chemical composition of organic material.

A type of heating system where heat, resulting when electric current flows through an "element" or conductor, such as Nichrome, which has a high resistance, is radiated to a room.

All the components of the appliance used to condition interior air of a building.

Alternating current in which three separate pulses are present, identical in frequency and voltage, but separated 120 degrees in phase.

A unit or measure of electricity supply or consumption of 1,000 Watts over the period of one hour; equivalent to 3,412 Btu.

Energy supplied during periods of relatively high system demands as specified by the supplier.

A measure of the amount of light incident on a surface; measured in foot-candles or Lux.

A wood or gas burning heating appliance that fits into the opening or protrudes on to the hearth of a conventional fireplace.

A type of motor designed to operate precisely at the synchronous speed with no slip in the full-load speeds (rpm).

The absolute centimeter-gram-second unit of force; that force that will impart to a free mass of one gram an acceleration of one centimeter per second per second.

The ability of a building construction assembly (partition, wall, floor, etc.) to resist the passage of fire. The rating is expressed in hours.

A unit of rate of operation. Electrical Hp: a measure of time rate of mechanical energy output; usually applied to electric motors as the maximum output; 1 electrical Hp is equal to 0.746 kilowatts or 2,545 Btu per hour. Shaft Hp: a measure of the actual ...

The force that pulls a wind turbine blade, as opposed to drag.

A measure of the number of cycles or wavelengths of electrical energy per second; U.S. electricity supply has a standard frequency of 60 hertz.

The period of low energy demand, as opposed to maximum, or peak, demand.