Quote:
Originally posted by shakran
well 220 is cheaper. Look at it this way. You have a 1500 watt hair dryer. At 120v, that draws 12.5 amps. At 220v that draws 6.8 amps.
|
duh....Power (wattage) is the key.... The ONLY way 220 is cheaper is when the power loss due to heating of the wires is considered...
120volts x 10 amperes = 1200 watts
240volts x 5 amperes = 1200 watts
Our 220 (240) is the function of both phases (A&B) feeding current rather than 1 phase feeding from ground (Neutral).
Do we want to get into "Delta" and "WYE" transfomers and the difference between 208 and 220(240)???