On Sep 1, 1:02*pm, Chris Friesen wrote:
On 09/01/2009 11:08 AM, Doug Miller wrote:

In article , Chris Friesen wrote:
I agree it will draw half the current. *Assuming properly sized
conductors such that voltage loss is negligible, why would 6A at 240V
behave any differently than 12A at 120V? *In both cases we're drawing 1440W.

Higher voltage.

Huh? *Voltage is just potential. *You need power to do work, and the
amount of power (and thus the amount of work that can be done) is the
same in each case.

Power is proportional to the *square* of the potential.

Faster startup implies that the mechanical work of spinning up the motor
is done in a shorter amount of time. *This means either the motor is
more efficient at 240V or else it's drawing more power. *In both cases
this would be due to motor design, not simply higher voltage.

Not more efficient, but does have more *power* available, all else
being the same.