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

In residential electrical systems, alternating current (AC) is predominantly used due to its efficiency in power distribution over long distances and its ability to easily transform voltage levels via transformers. The typical voltage supplied to homes in many regions is AC, commonly at either 120 volts or 240 volts, depending on the application (lighting, appliances, etc.).

One of the key advantages of AC is that it can be generated and transmitted at high voltages, which reduces energy loss during transmission. Once the electricity reaches its destination, it can be stepped down to safer, lower voltages suitable for residential use.

While direct current (DC) is used in certain applications, such as battery-operated devices and some renewable energy systems, it is not the standard for residential wiring. Residential systems are designed primarily to accommodate the supply of AC from local power grids. High-frequency current typically is not used in standard residential electrical applications, as it is more relevant to specialized fields like telecommunications and certain types of electronics.

In conclusion, alternating current is the standard for residential electrical systems because of its effective transmission capabilities and compatibility with the existing infrastructure.