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.
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.
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.
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.
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.
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.
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.