What is an advantage of a three-phase system over a single-phase system?

A three-phase system provides more constant power and is more efficient for heavy loads primarily due to the consistent nature of power delivery across the phases. In a three-phase system, the power supply is divided into three separate alternating currents that peak at different times, allowing for a smoother and more stable energy output. This results in less fluctuation in voltage and current, which is especially beneficial for motors and heavy machinery that require a steady and continuous power supply.

Additionally, three-phase systems can handle heavier loads more effectively as they can deliver greater power without the need for significantly larger conductors or connections, leading to improved efficiency. This characteristic reduces the amount of energy lost during transmission and allows for smaller, lighter electrical components than would be necessary in a single-phase system when delivering the same amount of power.

The other options, while they may contain elements that could be perceived as advantages, do not accurately capture the primary benefits of a three-phase system as compared to a single-phase system, particularly regarding efficiency and power stability.