Split-phase is a type of electrical power system commonly used in residential settings, particularly in North America. It involves two 120-volt alternating current (AC) lines that are 180 degrees out of phase with each other. This configuration allows for both 120-volt and 240-volt circuits, providing flexibility for various household appliances. In a split-phase system, the two 120-volt lines are connected to a center-tapped transformer. The center tap serves as a neutral point, enabling the delivery of power to different devices. This setup is efficient for powering standard appliances like refrigerators, washing machines, and air conditioners.