# Types of Electric Current – Steady (DC), Varying & Alternating (AC) Current

- Link: https://studyelectrical.com/2019/11/types-of-electric-current-steady-dc-varying-alternating-ac-current.html
- Published: 2019-11-05T07:04:16+00:00
- Author: Tesla

The directed flow of free electrons (or charge) is called the electric current. 
The electric current may be classified into three main types:

 1. Steady current (DC Current)
 2. Varying current
 3. Alternating current (AC Current)

Read: [What are Current and Voltage?](https://studyelectrical.com/2017/12/what-are-current-resistance-and-voltage.html)

![Electric current types](https://studyelectrical.com/wp-content/uploads/2019/11/
Types-of-Electric-current.png)

Types of Electric current

## Steady current (DC Current)

The first type of electric current we are going to discuss in the steady current(
DC Current).

Steady current or dc current is the current whose magnitude does not change with
time. It is constant with time.

![Dc current](https://studyelectrical.com/wp-content/uploads/2019/11/Steady-state-
or-Dc-current.png)

Steady (DC) current

The figure shows the graph between steady current and time. The value of current
remains the same as the time changes.

The current provided by a battery is almost a steady current (d.c.).

## Varying Current

When the magnitude of current changes with time, it is called a varying current.

![Varying current](https://studyelectrical.com/wp-content/uploads/2019/11/Varying-
current.png)

Varying current

The figure shows the graph between varying current and time. Note that the value
of current varies with time.

## Alternating Current

An alternating current is another type of electric current whose magnitude changes
continuously with time and direction changes periodically.

Due to technical and economic reasons, we produce alternating currents that have
sine waveform (or cosine waveform) as shown in the figure.

![Alternating type of AC electric Current](https://studyelectrical.com/wp-content/
uploads/2019/11/Alternating-AC-Current.png)

Alternating AC Current

It is called alternating current because current flows in alternate directions in
the circuit, i.e., from 0 to T/2 second (T is the time period of the wave) in one
direction and from T/2 to T second in the opposite direction.

The current provided by an AC generator is alternating current that has sine (or
cosine) waveform.

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