Quote:
Originally Posted by bbrocksr
12 volts needs less amperage to do the same job that's why the cables are smaller.
12 volts 250 amps is equal to 6 volt 500 amps.
When you double the voltage you only need half the amperage.
Bill
|
You are correct up to a point. To do the same job, requires the same
power so with double the voltage, you only need half the amps. Trouble is, a 12 v starter doesn't do the same job as a 6 v one. It spins the motor faster because it has more power, hence more than half the amps.
Everybody knows what happens to a 6v globe if you put 12v through it. so we use a different globe (higher resistance) to give the same power. With double the voltage and the same power, the current is halved. THAT is why we are able top use thinner cables with 12v.