Which of the following is a key benefit of using a three-phase system?

A three-phase system is designed to deliver alternating current more efficiently than single-phase systems, which is primarily why higher efficiency and power delivery is a key benefit. In a three-phase system, power can be transmitted more evenly and effectively, allowing for a smaller conductor size for the same amount of power delivered, which can lead to reduced line losses during transmission. This setup allows electrical devices and motors to run more smoothly and with less vibration, resulting in improved performance and longevity.

This efficiency makes three-phase systems ideal for industrial applications, where large amounts of power must be distributed to multiple machines or throughout extensive facilities. Additionally, a three-phase system can maintain a constant power flow, preventing the fluctuations that can occur in single-phase systems.

Other options, while they may have their advantages in certain contexts, do not directly align with the core benefit of a three-phase system regarding effective power transmission and efficiency.