What type of current is typically used in residential electrical systems?

Residential electrical systems typically use alternating current (AC) because it is efficient for power distribution over long distances. AC allows for the use of transformers to adjust voltage levels, making it easier to transmit electricity from power plants to homes without excessive energy loss. The adaptability of AC to different voltage levels and its ability to easily change direction makes it suitable for the varying power needs of residential appliances and electronics.

In contrast, direct current (DC) is commonly found in batteries and electronic devices, but it is not practical for residential power distribution due to limitations in voltage regulation and transmission efficiency. Polyphase current is primarily used in industrial settings for three-phase power systems, which provide a more stable power supply for heavy machinery rather than typical household use. Pulsating current is used in specific applications like battery charging but is not standard for residential electrical service.