The product of electric current and electromotive force; that is, multiplication of current flowing by voltage forms the basis of the calculation of electric power.

In a direct current (DC) circuit, the current measured in amperes, multiplied by the voltage between wires, is the power in watts.

A thousand watts constitute the kilowatt, a larger and more frequently employed unit of electric power.

The voltage and current may not be in phase with each other in an alternating current (AC) circuit and, while the instantaneous power is the product of the instantaneous voltage and current, this out-of-phase relation causes the power to fluctuate between positive and negative values.

1. An instrument; such as, an ampere-hour meter, that measures electrical power and totals its measurement with time.
2. A device that measures electric power consumed, either at an instant, as in a wattmeter, or averaged over a time interval, as in a demand meter.

A demand meter is any of several types of instruments used to determine a customer's maximum demand for electric power over a time interval; generally it is used for billing industrial users.

For many years, the term power, in association with electricity, has tended to lose its true meaning; so, power is often found used in nontechnical literature where actually the correct term energy should be used.

By definition, power is the rate at which energy is transformed or is made available and is measured in watthours.

From an economic viewpoint, the most important of all electrical measurements is the measurement of energy. The watthour meter in various forms can be found in nearly every home, factory, highway billboard, and other locations where electrical energy is being purchased.

Metering, installation and wiring have been governed by national, industrial, and local codes for so many years that, at least in the United States, a particular type of installation is nearly identical everywhere in the country.

Measurement of energy is almost always with a "fixed-installation metering". This provides safety because of the grounding of the meter enclosure and ease of reading as a result of a proper location and mounting.

Tamper-proof housing, which are also weatherproof where necessary, are typical structures that normally insure the integrity of the electric meter readings.

A data network which uses a building's electrical system as the transmission system and regular wall outlets as connecting points.

Powerline networks do not interfere with the delivery of electricity in the same circuit because the data are transmitted at a much higher frequency than the 60Hz or 50Hz used for AC (alternating current) power.

Machinery that converts raw energy into useful applications; such as, light, power for machinery, etc.: The electric power plant is a hydrosteam, diesel, or nuclear generating electrical station for uses of all kinds of equipment or transportation services.

This "plant" reference is apparently linked to the action of pressing on a shovel, or some other tool, with the "sole of the foot" in order to work the soil for planting.

1. A generating station or an electric power substation.
2. A facility that generates electrical energy using generators.
3. An assembly of equipment in an electric power system through which electric energy is passed for transmission, transformation, distribution, or switching.

1. A complex assemblage of equipment and circuits for generating, transmitting, transforming, and distributing electric energy.
2. The circuitry applied to many electrical devices, in which electric energy is generated, transmitted, transformed, and distributed in the form of heat or as a driving force to other motor-controlled systems.

The large-scale production of electricity for various commercial, industrial, residential, and rural use, generally in places designed for that purpose: Although limited amounts of electricity can be generated in various ways, including chemical reactions (as in batteries) and engine-driven generators (as in automobiles and airplanes), electric power generation generally implies large-scale productions in stationary factories, or industrial sites, that are designed for that purpose.

A method of producing electricity from solar energy by using focused sunlight to heat a working fluid, which in turn drives a turbo-generator.