What type of current alternates in polarity?

Alternating current is characterized by its ability to alternate in polarity, meaning it changes direction periodically. This property allows alternating current to be effectively transformed in voltage and transmitted over long distances with minimal energy loss. It is commonly used in residential and industrial power supplies because it can easily be converted to different voltages using transformers, making it versatile for various applications.

The alternating nature of the current is crucial for many electrical devices, such as motors and generators. By alternating between positive and negative cycles, alternating current can provide a stable and efficient energy supply that can power homes and businesses seamlessly. This is in contrast to other types of current, which do not have the same alternating characteristics.