In the US AC current oscillates at 60 Hz.
http://www.answers.com/alternating+current
It alternates.
The alternates are Elizabeth Price, Anna Li, and Sarah Finnegan.
The frequency of pulsating DC, often referred to as pulsating direct current, is determined by the rate at which the voltage alternates between its maximum and minimum values. In a typical scenario, this frequency corresponds to the frequency of the alternating current (AC) supply from which it is derived, such as 50 Hz or 60 Hz. Pulsating DC can be generated through rectification of AC, leading to a waveform that oscillates but does not alternate in polarity. The frequency of the pulsating DC is thus defined by the rectification process and any filtering applied to the output.
In an electrical circuit, the relationship between voltage and frequency is that they are independent of each other. Voltage refers to the electrical potential difference between two points in a circuit, measured in volts. Frequency, on the other hand, refers to the number of cycles per second of an alternating current, measured in hertz. While voltage can affect the power of an electrical circuit, frequency determines the speed at which the current alternates direction.
Frequency is independent of voltage magnitude. It depends upon type AC or DC.
60 Hertz
-- There's no such thing as 'indirect' current.-- Direct current has no frequency. As soon as you mention 'frequency',you're talking about alternating current.
Hz stands for Hertz, which is a unit used to measure the frequency of alternating current (AC) in an electric system. It represents the number of cycles per second that the current alternates direction. Most electrical systems operate at either 50 Hz or 60 Hz depending on the region.
Frequency doesn't depend on either voltage or current.
In AC voltage, frequency refers to the number of complete cycles per second that the voltage alternates direction. This is because in AC voltage, the direction of current flow continuously changes over time. In DC voltage, there is no alternation of direction, so frequency is not applicable.
A frequency converter is a power electronic device. It transforms Direct current to Alternating current of desired frequency and magnitude.
There is only one type of direct current and its 'frequency' is zero.