Re: Re: Re: Difference between volts and amps ???

Posted by Bob on January 22, 2004 at 06:46:25 from (24.145.166.158):

In Reply to: Re: Re: Difference between volts and amps ??? posted by Drill on January 22, 2004 at 06:08:52:

Drill, I've always heard it the other way around, and think you may have gotten your analogy crossed up. Current (amps) is similar to water volume (gallons per minute), and voltage (volts) is similar to pressure (psi). Just like a large volume of water requires a large diameter pipe, a lot of current or amperage requires a large diameter conductor. You can have high voltage and high pressure in a very small diameter pipe or conductor, but that small diameter won't carry much current or GPM.

The two are related, in that a doubling of the voltage will cause double the current to flow, provided that the resistance doesn't change. That's why it's so important to have good heavy conductors, good grounds and clean connections in the starting circuits of those old 6 volt tractors. You can't control the voltage available, and you can't change the resistance of the starter, so the only thing you do have control over is the resistance in other parts of the circuit. With large conductors (battery cables) and clean connections, the maximum amount of current will be available at the starter.

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