On an automotive ECU, the ECU turns the "grounding" of any given circut on and off. Which turn the electron flow on and off. Which would pulse, say, a fuel injector. The voltage is always at the fuel injector; it just need a path to complete the circut, and fire the injector. So the ECU "grounds" it.
As was stated, less arcing, because you are switching less energy, post-load.
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Today's Featured Article - The Cletrac General GG and the BF Avery A - A Bit of History - by Mike Ballash. This article is a summary of what I have gathered up from various sources on the Gletrac General GG and the B. F. Avery model A tractors. I am quite sure that most of it is accurate. The General GG was made by the Cleveland Tractor Company (Cletrac) of Cleveland, Ohio. Originally the company was called the Cleveland Motor Plow Company which began in 1912, then the Cleveland Tractor Company (1917) and finally Cletrac.
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