HI ROy,   
      
   On Sun 2011-Sep-04 12:00, Roy Witt (1:387/22) wrote to TOM WALKER:   
      
    RW>> The difference of course is in how much it costs to run the   
    RW>> compressor. In an industrial environment, running anything on 110v   
    RW>> costs twice as much to run as the same piece of equipment on 220v.   
    RW>> Even less if it's 220v 3 phase.   
      
    TW> That statement got lost in this old Brain. cost of rinning an   
    TW> electric motor for an air compressor is a function of the horsepower   
    TW> of the motor.   
      
   Roy> No, it's more than that. When you use 110v at 10amps to run an   
   Roy> electric motor, it will cost you twice as much as a 220v motor,   
   Roy> because the 220v motor will use half the amps.   
      
   Right, but the wattage used is the same, and it's watt/hours you're billed for   
   iirc.   
   RW> Power used in Watts is equal to Amperage times Voltage.   
      
   Roy> Or,   
      
   Roy> Amps = Power in Watts divided by Voltage.   
      
   Roy> 5000 Watts of Power / 220v = 22.7 Amps.   
   Roy> 5000 Watts of Power / 110v = 45.5 Amps.   
      
   Right, but that 5 kw is what they use to figure your bill.   
      
      
   Regards,   
              Richard   
   ---   
    * Origin:  (1:116/901)