Each of these ratings are the same appliance/circuit. Over the years as more loads are placed on the same conductors, more electricity is used to account for the growing amount of loss across the conductors etc. The increase in the rating numbers is because the power system sends the electricity in slightly higher voltages to account for loss. I could give you numbers, but, you need to know that the power isn't sent to your home as 110, 115 or 120. It is sent as either 480 or 240, depending on the aberage loads of your community etc. It is transformed to 240 in many cases at the pole or ground transformer. It is the large round canister on the pole. The power is broken down at the panel to 120. The various numbers used to discribe the same circuit represent the higher rating that it is conducted across the wires, however, before I start on some type of essay.
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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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