nd a separate low voltage winding. Autotransformers are often used to step uporstep down voltages in the 110-115-120 V range and voltages in the 220-230-240 V range - for example, providing 110 Vor120 V (with taps) from 230 V input, allowing equipment designed for 100or120 V to be used with a 230 V supply. This allows US electrical equipment to be fed from the higher European voltage. Autotransformers can also be used to supply European 230 V appliances from a 100or120 V supply in countries outs