What is the main difference between AC and DC current?

The main difference between AC (Alternating Current) and DC (Direct Current) lies in the direction in which the current flows. AC changes its direction periodically, which means that the flow of electric charge reverses at regular intervals. This characteristic allows AC to be transmitted efficiently over long distances, making it suitable for power grids and household electricity supply.

On the other hand, DC flows in a single direction consistently, which is typical of the electricity stored in batteries or used in many electronic devices. This unidirectional flow is what makes DC reliable for applications where a constant voltage is needed, such as in computers and other digital devices.

The distinction in behavior between AC and DC is fundamental in electrical engineering and influences how these currents are generated, transmitted, and utilized in various applications. Understanding this difference is crucial for anyone working in fields related to electrical systems, as it impacts everything from circuit design to power distribution.