What is the difference between single-phase AC and three-phase AC voltage?

Question

Quizplus · Accepted Answer

The Answer is Single-phase AC has one sine wave and points where the system has no EMF in the system.Three-phase AC has three sine waves 120 degrees apart electrically.This results in a system that always has EMF working in the system and is thus more efficient.Another benefit of three-phase AC is the fact that neutrals are not needed due to the way the sine waves interact.

What Is the Difference Between Single-Phase AC and Three-Phase AC