Step motor voltage question

Hi all...

I have a motor rated at 5V at 4A and my power suply is 12V at 12.5A. Ohms l=
aw says I
need a 1.75 ohm power resitor. Problem is that I can only find 1.5 and 2 o=
hms.
In your experience, can a good quality motor take a little more than it's
rated voltage? In other words, am I better off going with a little less
resistor and passing a little more current or should I go with a a little =
more
resistor and pass a little less current?

Thanks...Ross









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