What is a three-phase system in electrical contexts?

A three-phase system in electrical contexts refers to an electrical power distribution method that uses three conductors to carry alternating current. Each conductor carries an alternating current that is offset in time from the others by one-third of a cycle, or 120 degrees. This configuration allows for a more efficient and consistent power supply than single-phase systems.

Using three conductors with respect to one ground or neutral provides several advantages, including smoother power delivery and the ability to conduct more power over a smaller conductor size. This setup supports larger loads and is commonly used in industrial and commercial applications, where high power demands are present.

The options that describe power supplied by single conductor systems, functioning only with alternating current, or operating at low voltage do not accurately capture the essence of a three-phase power system. A three-phase system is specifically characterized by its three conductors, which allows it to achieve greater efficiency and reliability in power distribution.