This might help you:
http://cosmos.phy.tufts.edu/mhonarc/elec-trak/msg00248.html

Vasile

On 11/10/06, Wouter van Ooijen <wouter@voti.nl> wrote:
> A DC motor question: I have a DC motor for 24V nominal. How does the
> current drawn depend on the voltage, and does that dependency depend on
> the load? I guess in a stall condition the motor behaves as simple a
> resistive load, but is this also the case under a 'nomral' load? And
> unloaded? I guess these questions show my lack of basic motor
> knowledge....
>
> Wouter van Ooijen
>
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> Van Ooijen Technische Informatica: www.voti.nl
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