AC power, or alternating current power, is a type of electrical current that reverses direction periodically. Unlike direct current (DC), which flows in one direction, AC power changes its flow direction, typically at a frequency of 50 or 60 hertz, depending on the region. This characteristic makes it suitable for long-distance transmission, as it can be easily transformed to higher voltages, reducing energy loss. Most household appliances, such as refrigerators, televisions, and computers, operate on AC power. The electricity supplied to homes and businesses is usually in the form of AC, allowing for efficient distribution through power lines. This widespread use of AC power is largely due to the work of inventors like Nikola Tesla, who developed technologies to harness and distribute it effectively.