'Kinda wonder why the battery manufacturer doesn't make the batteries 1.5 volts'
Cell voltage is determined by the chemistry of the cell...the only control the manufacturer has is to stack multiple cells if higher voltages are needed. None of the commonly available rechargeable chemistries exactly match the voltage of the old 1.5 volt carbon-zinc/alkaline primary cells.
Lead-acid cells are approximately 2 volts, nickle-cadmium and nickle-metal-hydride cells are approximately 1.2 volts, and lithium-ion cells are approximately 3 volts.
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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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