A good question actually. You are correct, the 10amp 240V heater uses 2400watts per hour while making 8184 btu. No money savings as a watt is a watt but......Given the same sized supply wire the and same wattage. There is less loss/heating/wasted power in the supply cbales. Engineers do consider power cable losses as a serious heat calculation. Regarding power conductors heating making extra air conditioning load in large buildings. My well meaning maternal GrandFather always claimed he was using only half the power to run the electric water heater. By conencting it 120V rathe rthan 240V. He couldn't understand that total KW hrs were exactly the same .And that it would take four times longer for the tank of water to reach full temp.
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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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