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electricity delivered by U.S. utilities at 60 Hz, and 120 volts.

electrical current; a measure of flowing electrons.

measure of flowing electron for a period of time.

an energy audit seeks energy inefficiencies and prescribes improvements.

A collection of cells that store electrical energy; each cell converts chemical energy into electricity or vice versa, and is interconnected with other cells to form a battery for storing useful quantities of electricity.

British Thermal Unit, the amount of heat required to raise the temperature of one pound of water one degree Fahrenheit; 3411 BTUs equals one kilowatt-hour.

a modern light bulb with an integral ballast using a fraction of the electricity used by a regular incandescent light bulb.

the complement of AC, or alternating current, presents one unvarying voltage to a load. This is standard in automobiles.

a narrow mathematical I concept describing the proportion of a resource that can actually be converted' into useful product or work; for example, sunlight falling on a PV module contains a given amount of energy, but the module can only convert a percentage of it into electricity.