Why is AC predominate worldwide?

• A. Ability to transform voltage
• B. Lower cost
• C. Better insulation
• D. Simpler generation

Answer: (A)

Transforming voltage is the main reason AC dominates. With transformers, voltage can be stepped up for long-distance transmission and stepped down for safe use by homes and industry. High voltage means lower current, which greatly reduces energy losses along power lines, making widespread, efficient delivery practical. Once the power reaches populated areas, it’s easily reduced to usable levels for everyday devices. This ability to change voltage efficiently is what makes AC the standard for the global grid. While other factors can influence costs or insulation, the essential advantage is the straightforward voltage transformation that AC enables.