for an increase in voltage IN THE SAME SYSTEM you use ohm's law. I= V/R
As voltage increases with resistance remaining the same, amps increase.
a 24 volt system vs 12 volt system the resistance isn't the same.
it would have to be twice that of a 12 volt system to require half the amps.
they decide on 12 volt vs 24 volts based on watts used amps times voltage. so if for instance a starter requires 480 watts at 12 volts you would pull 40 amps but a 24 volt system pulling 480 watts would only need 20 amps.
but the physical starter would be wired differently increasing the resistance.
No, not how it works at all.
Other than getting the formula for current right you got everything else wrong.
In a given system if you double the voltage you halve the current, do the math. You do not double the resistance because you doubled the voltage. The resistance has no need to change if you go from 12 to 24 volts and if you think that just upping the voltage will magically up the resistance you know even less about how electrical circuits work.
They say there are no such thing as a stupid question. They say there is always the exception that proves the rule. Don't be the exception.
