04 Sep 11 23:45, Richard Webb wrote to Roy Witt:   
      
    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.   
      
    RW> Right, but the wattage used is the same, and it's watt/hours you're   
    RW> billed for iirc.   
      
   Of course the wattage could be double, allowing that 220v does more work.   
      
    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.   
      
    RW> Right, but that 5 kw is what they use to figure your bill.   
      
   That was my bottom line as well. What can be seen is that a 220v motor   
   will do the same work while using less power. Not that your bill will   
   change if you use it to do the same work.   
      
                   R\%/itt   
      
      
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