For underground circuits, the system uses transformers mounted on concrete pads at ground level. For overhead circuits, transformers are mounted on poles. These transformers convert the power to 110/220 volts for delivery to homes, schools, hospitals and small businesses. The 110-volt power is used to operate smaller appliances while the 200-volt power operates larger appliances like ovens and clothes dryers. After power leaves the distribution station, it goes through one more transformer before it can be used in your home.