What is a three-phase power system?

A three-phase power system is characterized by the use of three alternating currents that are offset in phase by 120 degrees. This configuration allows for a more efficient and consistent distribution of electrical power. In a three-phase system, each phase reaches its peak voltage at different times, which helps to ensure that the total power delivered is constant rather than fluctuating, as it can be in single-phase systems.

The advantages of this setup include greater power delivery with less conductor material, improved efficiency for large motors and equipment, and a more balanced load, which reduces the strain on electrical infrastructure. This phase-shifting nature also contributes to smoother operation of machinery and equipment powered by the system.

The other options do not accurately describe a three-phase power system. The mention of two alternating currents pertains to a single-phase system or possibly a two-phase system, which is not standard in modern power systems. Single-phase systems, typically used for low voltage applications, cannot match the power capabilities and efficiency of three-phase systems. Describing a three-phase system in terms of a battery setup is also incorrect, as batteries do not operate based on phase offsets in alternating currents.