RE: [CAD_CAM_EDM_DRO] Re: welding machine as a power supply

This should have been at the top of my previous post:

Close, but don't you mean "at a given load (in current)", NOT "(in watts)".?
The voltage drop across the series resistance will equal I * R. The only way
the voltage drop across a fixed resistance will be constant is if the
current is constant. For constant watts as voltage goes up, current goes
down. (Power equals volts * Amps-assuming power factor of 1, of course).
That's where the power savings comes from.


Andy Wander
Verrex Corporation

This has nothing to do with transmission line theory. In that case
you are starting with a fixed resistance per foot. At a given load
(in Watts)

Here's where I disagree

the voltage drop across the series resistance will remain
the same regardless of the voltage. So at 120V the voltage drop
across twenty miles of line might be 50V. At 10,000 volts the same
load (in watts) still has 50V which is a much smaller percentage of
the total.