What is the primary difference between AC and DC current?

The primary difference between AC (Alternating Current) and DC (Direct Current) lies in the direction of the electric flow. AC alternates its direction, meaning that the current changes its path periodically. This is typically seen in household outlets where the voltage switches from positive to negative in cycles, which allows for efficient transmission of electricity over long distances.

In contrast, DC flows in one direction only. This direct flow is typical for battery-powered devices, where the electric current moves from the positive terminal to the negative terminal, providing a steady voltage output.

Understanding this fundamental difference is crucial for anyone working with electrical systems, as it affects how different devices and electrical infrastructure are designed and operated. The other choices suggest incorrect characteristics about AC and DC currents, such as simultaneous flow directions and misconceptions about voltage levels, which can lead to confusion in practical applications and troubleshooting in electrical work.