A sinusoidal quantity having a frequency that is an integral multiple of the frequency of a periodic quantity to which it is related.

A power source/generator that operates independently of or is not connected to an electric transmission and distribution network; used to meet a load(s) physically close to the generator.

A device used to transfer heat from a fluid (liquid or gas) to another fluid where the two fluids are physically separated.

Fuels that cannot be easily made or "renewed," such as oil, natural gas, and coal.

A popular term used to describe the increase in average global temperatures due to the greenhouse effect.

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

The average power output of a wind energy conversion system at a given mean wind speed based on a Raleigh frequency distribution.

The angle at which a solar collector or module is set to face the sun relative to a horizontal position. The tilt angle can be set or adjusted to maximize seasonal or annual energy collection.

A machine for converting mechanical energy into electrical energy by magneto-electric induction; may be used as a motor.

A term applied to warm-air heating systems that deliver heated air to rooms by means of registers or baseboards located along exterior walls.

Energy available from the movement of the wind across a landscape caused by the heating of the atmosphere, earth, and oceans by the sun.

A device for measuring power consumption.

The amount of kinetic energy gained by an electron when accelerated through an electric potential difference of 1 Volt; equivalent to 1.603 x 10

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.

A structure or media from which heat can be absorbed or extracted.

A device that can be set to automatically turn appliances (lights) off and on at set times.

A measure of the percent of moisture actually in the air compared with what would be in it if it were fully saturated at that temperature. When the air is fully saturated, its relative humidity is 100 percent.

An electrical device for converting alternating current to direct current. The chamber in a cooling device where water is separated from the working fluid (for example ammonia).

SMES technology uses the superconducting characteristics of low-temperature materials to produce intense magnetic fields to store energy. SMES has been proposed as a storage option to support large-scale use of photovoltaics and wind as a means to smooth ...

A type of solar heating system that circulate warm water from storage through the collectors and exposed piping whenever freezing conditions occur; obviously a not very efficient system when operating in this mode.