if my 12v motor draws 10amp when running am i right to think if i put 6v on the same motor it will run at half speed? how would i work out the resistor needed to do it?(adsbygoogle = window.adsbygoogle || []).push({});

i think i need to be using ohm's law somehow but cant remember just how,its been a while since i've needed to do something similar...

thanks craig

p.s its for my car with only one speed at the moment

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# How to calculate resistor values

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