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Efficiency is Output/Input not voltage. The only efficiency derived from voltage is cost efficiency The higher the voltage the lower the resistance on the same wattage. This equates to smaller wire size and equipment. eg. 5 HP motor x 746 = 3730 watts. Watts = Amps x Volts. A 5 HP motor on 120 volts, 3730/120 = 31 amps. The same 5 HP motor on 480 volts, 3730/480 = 7.77 amps. The first motor would need #8 wire, where as the second motor would need #14 wire. This is where the cost savings are appreciated. There is no difference since electricity is puchased by kWh. As shown in the answer above the watts are the same using either voltage. Only the amperages are changed proportionatly as the voltage is changed, watts are the same.

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