An engineer would describe lightning as an impulse. An impulse theoretically has infinite magnitude but zero duration. You can only have a true impulse in mathematical terms, but a lightning bolt is close enough. One of the characteristics of an impulse is that it contains all frequencies from zero to infinity. That's why lightning interferes with radios (particularly AM radios that operate at low frequencies): the impulse generates rf energy across all broadcast bands.
Now, technically, lightning does not alternate: it travels in one direction only. But the rapid change of current is effectively high frequency because it has a very high rate of change.
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Today's Featured Article - 12-Volt Conversions for 4-Cylinder Ford 2000 & 4000 Tractors - by Tommy Duvall. After two summers of having to park my old 1964 model 4000 gas 4 cyl. on a hill just in case the 6 volt system, for whatever reason, would not crank her, I decided to try the 12 volt conversion. After some research of convert or not, I decided to go ahead, the main reason being that this tractor was a working tractor, not a show tractor (yet). I did keep everything I replaced for the day I do want to restore her to showroom condition.
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