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    Basic Electrical

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

    • Categories Basic Electrical, Electrical Circuits, Electronics, Interview Questions, Signals and Systems, Transmission Line
    Types-of-Electric-current

    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?

    Electric current types
    Types of Electric current

    Table of Contents

    • Steady current (DC Current)
    • Varying Current
    • Alternating Current
      • Related Articles

    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
    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
    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
    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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    Tesla Edison

    Tesla is an Electrical Engineer, Physicist and an Inventor in making. He is a good writer and author of many courses and articles published in this site.

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