Posted by 47M on October 09, 2014 at 20:30:54 from (216.161.72.183):
In Reply to: Re: 1951 Farmall C posted by mkirsch on October 09, 2014 at 05:16:24:
Ohms law is actually: V=IxR, where V is Volts, I is amperage (current), and R is the resistance of the circuit. Resistance isn't the same as Load. Load is measured in watts.
The formula for Watts is: W=IxV where W is Watts, I is still current, and V is still Volts.
So if the load (Watts generated by the starter motor) stays the same, and you double the voltage, the current needed will be less. It won't be exactly half, but it will be less.
That's why 6 volt battery cables have to be so much larger than 12 volt battery cables, 6 volt cables are carrying more current.
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