What is the predominant type of current used in transmission and distribution lines?

The predominant type of current used in transmission and distribution lines is alternating current (AC) due to several key advantages it offers over other forms of current.

One of the primary reasons for the widespread use of AC in power systems is its ability to be easily transformed to different voltage levels using transformers. This capability allows for efficient long-distance transmission of electrical energy. High-voltage transmission reduces the current flowing through the lines, which in turn minimizes energy losses due to resistance in the conductors.

Another important aspect of AC is that it can be generated more easily and economically using various sources, including hydroelectric, thermal, and wind power. The infrastructure for AC generation and distribution is well-established and widely adopted globally.

Additionally, the alternating nature of AC allows for the use of simple and cost-effective inductive and capacitive components in circuit design, which can enhance the efficiency and performance of power systems.

In contrast, direct current (DC), while useful in certain applications such as battery storage or electronic circuits, presents challenges for transmission over long distances due to greater energy losses and the difficulty of voltage transformation.

Static current and low-frequency current do not describe commonly used forms of electrical power in transmission and distribution systems and are therefore not applicable in this context.