Which of the following is a key advantage of AC power over DC power?

The key advantage of AC power over DC power primarily lies in its ability to be easily transported over long distances. This is largely due to the nature of alternating current, which can be transformed to higher voltages for efficient transmission. High-voltage transmission reduces the energy lost as heat due to resistance in the wires. Once the electricity reaches its destination, it can be transformed back down to a lower voltage that is suitable for use in homes and businesses.

In contrast, transporting DC power over long distances results in greater energy losses because the voltage cannot be easily stepped up or down. This limitation complicates long-distance transmission infrastructure and can lead to higher overall costs and inefficiencies. The ability of AC systems to utilize transformers for voltage change is a significant factor in their widespread implementation for power distribution.