Around 15,000 to 20,000 in the secondary windings of the ignition coil on most modern lawn mower engines. Alternator voltage varies with size of stator, from 2 to 40 VAC.
the magneto
just follow the spark pulg wire you cant miss it.
with a kohler regulator tester
does it have spark to the plug if not the part you might check would be the coil or the electronic start module probably the latter if it is a newer mower or of ots older then the coil magneto usually dont go bad could be a bad gap between the coil and the magneto if its an older mower could be a bad set of points if its an older mower point gap could be bad spark plug could be bad as I don't know exactly what the lawn mower is doing hard to tell what is wrong
12 volt
There is a "Flywheel" inside the motor that has a large magnet on it. This magnet passes a "Magneto" and that passing (EMF, Electro-motive force) causes a high voltage charge to provide power to the plug.
Goats.
This depends on the mower. With out knowing the make and model of the mower so I can look up the type of battery this question can not be answered
A gas lawn mower is a lawn mower which is powered by gasoline.
A lawn mower battery is charged by the magneto which creates spark using magnets while the engine is turned over. See the related link for a more in depth desrciption...
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