Negative. The dashed line below indicates the ground reference, and the solid line over it represents the voltage potential as being steady-state(direct current).
__________________________ +N volts
------------------------------ Grd
This is also as it would appear on a Oscilloscope where the dashed line is the reticule embossed on the face of the scope, and the solid line is the trace when a DC voltage is applied to the tip of the probe.
As for the reason this is done, it's an intl mime thing, where the iconic representation does not rely on the acronymic letters found in English.
Example: Alternating Current - AC in English is Courant Alternatif in French, which would abbreviate to: CA. and 'Voltage' would translate to 'Tension', so 'AC Voltage' in English is 'Tension CA', and so on and so forth for other languages. The "~" symbology is more international in understanding.
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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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