BS JD, your talking magic here. 120V uses TWO wires, the hot and the nuetral, just like 240V uses two wires, both hots, the nuetral is not used with 240V.
Both 120V and 240V need a supply line and a return path. On 120V, the hot line or nuetral, switch being the supply or return path 60 times a second at 60 cycle AC, but both carry the full amp load.
On 240V the nuetral is not used, and the two hot leads change off being supply or return path 60 times a second at 60 cycle AC.
The reason you need to flow twice the amps at 120V for a given wattage, is not that somehow all those amps are carried by 1 wire on 120V while 240V uses two, but that twice the voltage needs only 1/2 the amps to make the same wattage.
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