I think your method is OK - but possibly there was an error in the initial measurement of 0.3 ohms. Could be multimeter lead or connection errors? You may need to modify the method a bit. If you have a power supply you can set to constant current mode it is a good way to measure low resistances. Setup for a known currnt (1A?) and measure the voltage drop at the motor terminals. RP On 14/11/06, Martin K wrote: > I thought he said I=V/R > Honest mistake. Read what I mean, not what I write. > -- > Martin K > > Olin Lathrop wrote: > >> peteHVAC wrote: > >> > >>> I heard tell that measuring resistance of the motor and multiplying by > >>> voltage would give a close value of the lock rotor amps. any > >>> truth in this? > >>> > > > > Martin K wrote: > > > >> Yes that is true. > >> > > > > Huh!!? The units don't even match. Ohms times volts comes out to Kg m**2 / > > S C**2. I can't think of how such a quantity is meaningful, but it > > certainly isn't C / S. > > > > > > ******************************************************************** > > Embed Inc, Littleton Massachusetts, http://www.embedinc.com/products > > (978) 742-9014. Gold level PIC consultants since 2000. > > > > -- > http://www.piclist.com PIC/SX FAQ & list archive > View/change your membership options at > http://mailman.mit.edu/mailman/listinfo/piclist > -- http://www.piclist.com PIC/SX FAQ & list archive View/change your membership options at http://mailman.mit.edu/mailman/listinfo/piclist