Three-phase power is described as what?

• A. A circuit with multiple paths
• B. Direct current flows one direction
• C. Industrial electrical power system
• D. Alternating current changes direction

Answer: (C)

Three-phase power is best described as an industrial electrical power system. It uses three alternating currents that are out of step with each other—typically 120 degrees apart—to deliver power efficiently to large equipment like motors and transformers. This arrangement provides a smoother and more constant power delivery, reduces the amount of conductor material needed, and makes it easier to run heavy loads with less vibration. The other statements describe broader ideas but don’t capture what three-phase is specifically used for: a dedicated system for distributing electricity in industrial settings. The idea that AC simply changes direction is true of alternating current in general, not unique to the three-phase configuration, and DC flowing in one direction describes a completely different type of current.