# Alternating current

The alternating current , abbreviated shown as AC , is considered as a flow of charging power is reversed so periodic that one can say that starts from zero and increases to a maximum , decreases to zero, inverted , reaches a maximum in the opposite direction , back again to the original value and repeats this cycle in a manner indefinitely . The time interval between achieving a defined value intwo successive cycles is called the period , the number of cycles or periods per second is the frequency , and the maximum value in any direction is the amplitude of the alternating current.

## What is AC?

It is the type of electric current whose main characteristic is magnitude and direction , which have a variation in their cyclical type through a curve that rises and falls through a wave .

• Characteristics of alternating current
• Source
• History
• Who discovered
• What is it for
• How it is produced
• Frequency
• As measured
• How it differs from direct current
• How direct current is converted into alternating current
• Examples of appliances that work with alternating current

## Characteristics of alternating current

The main characteristics that we can observe in alternating current are the following:

• The way that alternating current oscillates is sinusoidal .
• It has the ability to transmit energy in an efficient way.
• Its magnitude and direction shows a cyclical variation .
• Its symbol is represented by the letters CA .
• It occurs when the flow of the electric current varies from time to time.

## Source

Its origin dates back to the year 1882 when the physicist , mathematician , inventor and engineer named Nikola Tesla , designed and built the first induction motor of current AC . Later, the physicist William Stanley , again used the principle of induction to transfer alternating current between two electrically isolated circuits .

## History

When the thrust of the alternating current is created, it entailed winding a pair of coils on a basis of iron which was known as coil induction . This was the way in which the precursor of the current transformer was obtained . The system used today was created by Nikola Tesla ; and the distribution of alternating current was in charge of George Westinghouse . Lucien Gaulard , John Gibbs and Oliver Shallen also contributed to the development and improvement of this system. . The first interurban alternating current transmission occurred in 1891 in Colorado and later it occurred in Germany.

## Who discovered

The first alternator to produce alternating current was made by means of a dynamoelectric generator based on the principles of Michael Faraday , and which was built by the French instrument maker Hippolyte Pixii in 1832.

## What is it for

Alternating current is the way many appliances work properly when plugged into a wall socket . It also serves to provide electricity to homes, it is also used in the telephone , radio , television . Probably one of the most important uses of alternating current is the supply of motive power for electric motors used in pumps , compressors , machines , tools .

## How it is produced

It is produced in alternating current generators . This process occurs when a coil moves in front of a magnet causing electrons to move in the coil wire. Depending on the amount of electrons that oscillate in each section of a conductor will be the intensity of the alternating current.

## Frequency

The frequency of the alternating current is a physical phenomenon that is repeated in a cyclical in a certain number of times over a B time. In order to determine the frequency of the alternating current, the following formula must be applied :

F = P x Vg / 120

Where:

• F : is the frequency in Hz
• P : is the number of poles which must always be even
• Vg : is the turning speed .

The advantages of alternating current are:

• It offers the possibility of producing cheaper and more efficient generators and motors , while at the same time being less complex .
• They have the possibility of transforming the voltage in a very simple and cheap way by means of transformers .
• Possibility of transporting large amounts of power over long distances using thus the minimum of stress .
• Possibility of manufacturing very simple motors .
• Disappearance of some electrical phenomena that are not desirable, such as magnetization in machines, and polarizations and electrolytic corrosion in metallic pairs.

## As measured

For sinusoidal signals of alternating current the following equation is used:

instantaneous = V p sin Ө

Where:

• V is the instantaneous value of the voltage , that is, the value at a given instant t.
• Vp is the peak value of the voltage , which is also known as the amplitude of the voltage.
• k is a constant of the current in question and is related to frequency .
• t is the time expressed in seconds

## How it differs from direct current

Alternating current is a type of electrical current where the direction of the flow of electrons comes and goes either through regular intervals or in cycles . This is the type of current that normally travels through power lines and is the electricity that we find in homes in wall sockets . Current DC is the electric current flowing to constantly in the same direction as the flowing apparatuses using batteries .

## How direct current is converted into alternating current

In order to transform a direct current into an alternating current we have to turn on and off so continuous and repeated and high speed the power supply via a switch . Devices that have the ability to do this are called Chopper . Adding a coil induces a current in the opposite direction to the original when the switch is turned on.

## Examples of appliances that work with alternating current

Some examples of devices that work with this type of current are:

• Washing machine
• Drying machine
• Refrigerator
• Kiln
• TV
• Music equipment
• Computer