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# Alternating Current
[Alternating current (AC)](https://en.wikipedia.org/wiki/AC_power)
is electric current that reverses direction periodically.
The voltage and current in an AC circuit oscillate in a sinusoidal manner.
The frequency of the oscillation is the number of complete cycles per second measured in hertz (Hz).
The frequency of the AC power grid in the United States is 60 Hz.
> [!quote] [Alternating current (AC)](https://en.wikipedia.org/wiki/AC_power)
> is electric current that reverses direction periodically.
> The voltage and current in an AC circuit
> oscillate in a sinusoidal manner.
> The frequency of the oscillation
> is the number of complete cycles per second measured in hertz (Hz).
> The frequency of the AC power grid in the United States is 60 Hz.
* Ungrounded conductor - "Hot"
* Grounded conductor - "Neutral"