What type of current do most electrical transmission lines carry?

Most electrical transmission lines carry alternating current (AC) because it is more efficient for long-distance transmission. AC can be easily transformed to higher or lower voltages using transformers, which allows for reduced losses during transmission over vast distances. This attribute is crucial in maintaining the stability and efficiency of the power grid, which serves multiple regions.

In addition, AC is suitable for powering homes and businesses since most electrical appliances are designed to operate with alternating current. The ability to step the voltage up for transmission and step it down for safe usage makes AC the preferred choice in the electrical industry.

While direct current (DC) has its applications, particularly in certain types of renewable energy systems and electronics, it is not the standard for electrical transmission lines. High-Voltage Direct Current (HVDC) is used in specific instances where its advantages, such as reduced line losses over extremely long distances, are needed, but overall, AC remains the dominant form of current used in transmission systems around the world. Standard battery current typically refers to the direct current produced by batteries and is not applicable to the context of transmission lines.