They don't exist. There's no known electrical machine principle to achieve this.Or for that matter a generator that can output both DC as well as AC with a variable frequency as needed. Where in the AC case the output frequency and waveform is not related to the shaft RPM but can be controlled separately like in an amplifier.
Modern electric cars use exclusively AC machines driven by inverters.But if you can push a Tesla Car in reverse , you might get DC
just a liquid metal contact to take off the current from the rotating shaft.
How does the oil prevent an arc being formed? The arc is the result of excessive high voltage that causes the local insulation to break down. I agree that the arcing can be reduced but it appears difficult to eliminate.This allowed them to pull the wire out of the mercury without producing and arc.
I was joking about pushing a Tesla in Reverse to get ACIt seems the most efficient hydro or turbine generators are AC, for some reason. But if you can push a Tesla Car in reverse , you might get DC
FWIW, If one has Windows, I have always used Irfanview which can display and convert any image format and any size.Hi,,
a word about pictures and their file size.
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