What is the main advantage of AC over DC in power transmission?

The primary advantage of alternating current (AC) over direct current (DC) in power transmission lies in its ability to be transformed to higher voltages. This capability is crucial for long-distance power transmission, as higher voltage levels reduce the current flowing through the transmission lines. By reducing current, we significantly decrease the power losses due to resistance in the wires, thereby making the transmission of electricity much more efficient.

Transformers, which are devices used to change the voltage of AC, allow for easy stepping up or stepping down of voltages. For instance, electricity can be generated at a relatively low voltage and then transformed into a much higher voltage for transmission. After it reaches the point of use, it can be transformed back down to a safe and usable voltage. This flexibility in managing voltage levels is a significant reason why AC is preferred for the bulk transmission of electrical power over great distances.

In contrast, while options regarding storage and generation of AC and DC have their own merits, they do not represent the core advantage of AC in transmission systems as effectively as its transformability.