Active energy

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The active energy , and active energy , or active energy is, in electrical engineering, the electric power that a electrical consumer receives and converts to other forms of energy - usually in radiant energy (light), mechanical, thermal or chemical energy. The active energy results from the time integral over the active power ; with constant power, this corresponds to the effective power multiplied by the duration of the energy consumption.

For electrical machines that absorb a certain amount of reactive energy, it is only the active energy that is converted into mechanical energy or mechanical work and into thermal losses.

For the task of calculating costs in the energy supply network , the active energy is measured; the effort is only higher for large customers. The measuring device for this is the energy meter , as it is known under various names in private households. The SI unit of active energy is the watt second ( unit symbol Ws). However, to avoid large numbers, the larger unit kilowatt hour (kWh) is common.

Individual evidence

  1. a b DIN 40110–1: 1994 alternating currents - two-wire circuits
  2. a b A term from EU Directive 2014/32 / EU on the provision of measuring devices on the market , Annex V (p. 209)
  3. A term from the EN 62053 – XX family of standards AC electricity meters - Special requirements - Part XX
        z. B. Part 11: Electromechanical active consumption meters of accuracy classes 0.5, 1 and 2
  4. Joseph Uphaus: Fundamentals of AC drive technology. Hanser, 2019, p. 197
  5. Martin Kahmann, Siegfried König (ed.): Competition in the liberalized electricity market: rules and techniques. Springer, 2001, p. 74.