How does three-phase electricity work?

Three-phase electricity is a set of equal amplitude, equal frequency, phase 120o phase difference between each other three-phase alternating current, three-phase generator with three windings generated by the industrial power supply is commonly used. For example, electric motors use three-phase alternating current, which is often referred to as the three-phase four-wire system. In daily life, however, single-phase power, also known as lighting power, is mostly used. When the lighting power supply, the use of three-phase electricity, one of the power supply to the power-using equipment, such as household appliances, and the other line is the fourth line of the three-phase four-wire, that is, the zero line, the zero line from the three-phase power neutral lead out.