alternating current is an electric current that reverses direction periodically as a function of time. This current produces an electromotive force, often abbreviated to EMF.
In its simplest form, an alternating current circuit consists of a source of alternating current, such as a generator, and a load, such as a light bulb. The source of alternating current produces a voltage that varies sinusoidally over time, causing the current to flow first in one direction and then in the other.
The frequency of an alternating current is the number of times per second that the current reverses direction. The standard frequency for alternating current in North America is 60 Hz, while in Europe it is 50 Hz.
The amplitude of an alternating current is the maximum value of the current. In most cases, the amplitude of an alternating current is measured in volts.
The average value of an alternating current is the value of the current that would produce the same power if it were a direct current. In most cases, the average value of an alternating current is measured in amperes.
*Alternating current circuits are used in a wide variety of applications, including power transmission, lighting, and electrical motors*.
