Their components can be in delta or wye configurations.
Instances of these devices with stacked lamination uses an alternate method of E and I laminations. Large ones can use oil for insulation. Scott-t ones can handle two to three phase connections.  Their components can be in delta or wye configurations. The cores of these devices can be three, four, or five limbed. Electric audio amplifiers, particularly those in a class b, use center tapped ones on the input and the output.  The ratio of voltages associated with one of these devices is proportional to the ratio of turns. They can be used to step up or down voltage.  For 10 points, name these devices that transfer electrical energy from one AC circuit to another using induction.
Instances of these devices with stacked lamination uses an alternate method of E and I laminations.
transformer