Merl
You have it backwards.
As I said with CONSTANT resistance double the voltage = double current and 4 X watts. True on AC or DC
DC motors in theory you are sorta correct BUT speed is proportional to voltage double voltage = double power. ROUGHLY
HP = T x RPM / 5252 double voltage thus RPM you double HP and watts again RUFFLY
AC motors you are reconnecting from paralleled windings ie 120 to seriesed 240. Half current and same wattage.
More gory details in first post.
Dan Bentler
Last edited by leitmotif; 10/17/2010 5:38 AM.