The single-phase voltage is 220V, which is used for the life of ordinary residents, and the voltage between the phase line and the neutral line. The two phases are A and B or C of the phase line, and the phase voltage between them is 380V. The common electrical appliance is a 380V electric welding machine. Three phase refers to the 380V phase to phase voltage between A, B and C, and the consumer is a three-phase 380V motor or equipment. A rectifier changes alternating current into direct current.
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