What is direct current (DC) and how does it differ from AC?

Direct Current (DC)

Direct current (DC) is a type of electrical current that flows in one direction, maintaining a constant polarity. It's produced by sources such as batteries, fuel cells, and solar cells. In a DC circuit, the current flows from the positive terminal to the negative terminal, and the voltage remains constant throughout the circuit.

Differences between DC and Alternating Current (AC)

  1. Direction of Flow:

    • DC flows in one direction.
    • AC changes direction periodically, typically 50 or 60 times per second (50Hz or 60Hz).

  2. Voltage:

    • DC voltage remains constant in a circuit.
    • AC voltage changes periodically, following a sine wave pattern.

  3. Power Transmission:

    • DC is not suitable for long-distance power transmission due to significant energy loss.
    • AC is used for long-distance power transmission because it can be stepped up to high voltages for efficient transmission and stepped down for use.

  4. Usage:

    • DC is used in applications where constant power is required, such as batteries in electronic devices, and in electric vehicles.
    • AC is used in most homes and businesses for powering appliances and lighting, as it can be easily transformed and controlled.
What is direct current (DC) and how does it differ from AC? — Alternating Current | Unlo