Single Phase AC Circuits : Definition and Circuit By Electrical Diary - Electrical Diary -->

# Single Phase AC Circuits : Definition and Circuit By Electrical Diary

## What is of Single Phase AC Circuit?

We know that direct current flow continuously in one direction.if the applied voltage and the circuit resistance are kept constant then the magnitude of the current flowing through this circuit remains constant over time.

If there is a change in either the applied voltage or circuit resistance then there is a change in the magnitude of the flowing current but the direction of the flowing current does not change. When the current flowing in a circuit varies in magnitude as well as direction periodically then this current is called alternating current.

The circuit is defined as a Combination of Different types of electronics and electrical Components which after getting an input signal (in the form of Voltage or Current or both)gives the output.

A circuit that consists of an electronics component like a Resistor, Capacitors, inductors, or combination of these components and uses a time-varying Current or Voltage as an input and also gives the output as a function of time is called AC Circuit.

### Definition of Alternating Current and Voltage

Alternating current and voltage is one that periodically passes through a defined cycle, consisting of two half cycles-during one of which the current or voltage varies in one direction, and during the other half cycle its varies in the opposite direction.

The circuit in which this alternating current or voltage is flowing is called AC Circuit. The alternating current system is invariably used for large scale power generation transmission and distribution.

Alternating voltage may be easily stepped up and stepped down efficiently with the use of the transformer. Alternating the current motor is cheaper simple in construction efficient and more robust as compared to dc motor. There is a graphical representation of AC sinusoidal Current or Voltage.
 Sinusoidal Wave Form Of Alternating Current

### Production of Alternating Voltage

When a conductor is rotated in a magnetic field then an alternating EMF is generated by changing the magnetic field within the stationary coil. The EMF thus generated will depend on the strength of the magnetic field, No turns of the coil, and the rotating speed of the coil.