Why is ac preferred over dc?

Another reason is that AC is simpler and cheaper to generate using alternators, whereas DC requires more complex equipment for large-scale generation.

AC (Alternating Current) is preferred over DC (Direct Current) for power transmission because it can be easily stepped up or down using transformers, which reduces energy loss over long distances.

DC is less efficient for long-distance transmission. AC allows high-voltage transmission, which minimizes current and reduces I²R losses in the wires.

Historically, AC became the standard during the "War of Currents" because Nikola Tesla and Westinghouse demonstrated its efficiency for national grids compared to Thomas Edison’s DC systems.