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What does alternating current mean?

Looking for the meaning or definition of the word alternating current? Here's what it means.

Noun
  1. an electric current in which the direction of flow of the electrons reverses periodically, such as sawtooth, sinusoidal or square wave current.
  2. an electric current in which the direction of flow of the electrons reverses periodically by a sinusoidal law, hence having an average of zero, with positive and negative values (with a frequency of 50 Hz in Europe, 60 Hz in the US, 400 Hz for airport lighting, and some others); especially such a current produced by a rotating generator or alternator.
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Examples
They connect only through tie lines where power must be converted from alternating current to direct current and back again.
An integral inverter changes the direct current to alternating current for transmission into the facility's electrical distribution systems.
There is a alternating current, instead of a direct current within the bobbin because of the motion of the string.
The inverter changes the solar direct current into the alternating current used by most household appliances.
Ac power is converted to a high-voltage Dc current, which an oscillator or resonator outputs as an alternating current.
In fact, while the national grid relies on alternating current for transmitting electrons, the internal Texas grid transmits via direct current.

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