# Alternating current (AC)

Alternating current (AC) is an electric current which periodically reverses direction, in contrast to direct current (DC) which flows only in one direction. AC is the form in which electric power is delivered to businesses and residences. The usual waveform of an AC power circuit is a sine wave, whose instantaneous value alternates between positive and negative values with zero average.

In a power grid, AC is generated at power plants and transmitted to consumers through a system of high-voltage power lines, transformers, and distribution lines.

### What is AC vs DC?

AC and DC are two types of electrical current. AC is alternating current and DC is direct current.

Alternating current means that the current reverses direction periodically. The frequency of the reversal is measured in hertz (Hz). In the United States, the standard frequency is 60 Hz. This means that the current reverses direction 120 times per second.

Direct current means that the current flows in one direction only.

The main difference between AC and DC is the direction of the current flow. AC current flows in both directions, while DC current flows in only one direction.

### What is meant by AC current?

AC current is an electric current that changes direction periodically. The standard definition of AC current is a current that changes direction sinusoidally with time. However, in practice, AC current can be any current that reverses direction periodically. The most common AC current is alternating current (AC), which reverses direction at a constant frequency, such as the current supplied by a power outlet in a home. AC current can also be produced by electronic devices, such as batteries, solar panels, and generators. What is AC used for? AC is used for a variety of purposes in the smart grid, including power generation, transmission, and distribution. AC can also be used to control the flow of electricity in the grid, and to monitor and manage grid conditions.

### Why is AC used over DC?

There are many reasons for using alternating current (AC) rather than direct current (DC) in the power grid. Some of these reasons are:

1) AC can be easily generated by rotating a magnetic field in a coil of wire (as in a turbine), while DC must be generated by other means (such as chemical reactions or solar cells).

2) AC can be easily transmitted over long distances using transformers, while DC cannot.

3) AC can be easily converted to other voltages (using a transformer), while DC cannot.

4) AC can be easily used in household appliances (such as lights and motors), while DC cannot. Are batteries AC or DC? Batteries are DC devices, meaning that they produce a direct current. However, many batteries are able to convert AC to DC, which makes them compatible with both AC and DC systems.