Posted by teddy52food on April 26, 2011 at 17:37:36 from (68.169.216.43):
In Reply to: Re: OT electrical ?? posted by John T on April 26, 2011 at 13:48:40:
This is where you have been falsely taught. Compare electricity with water, where flow is amps or gallons per minute and voltage is pressure psi. Take a garden hose & punch a small hole in it. This would represent the magnetic field coming out of the wire. Turn the water on and you will have a good flow (amps) out of the end of the hose with low pressure with very little coming out of the punched hole. Then as you close up the end of the hose , pressure will get higher and the stream ( magnetic field) will get greater also. But the flow is reduced. At least that is how I see it. When you use a 12 volt battery to boost a 6 volt system the starter spins the tractor engine faster than it does on 6 volts and the amps will be less with the 12 volt imput. Watch your meters when a battery gets low. When the voltage drops, the starter turns slower yet the amps will rise on each compression stroke. The amps create heat . The voltage creates the magnetic field.
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Today's Featured Article - Third Brush Generators - by Chris Pratt. While I love straightening sheet metal, cleaning, and painting old tractors, I use every excuse to avoid working on the on the electrics. I find the whole process sheer mystery. I have picked up and attempted to read every auto and farm electrics book with no improvement in the situation. They all seem to start with a chapter entitled "Theory of Electricity". After a few paragraphs I usually close the book and go back to banging out dents. A good friend and I were recently discussing our tractor electrical systems when he stated "I figure it all comes back to applying Ohms Law". At this point
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