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Lightning is an impulse. If you wish to break it down mathematically, it is many AC signals summed together (Think Taylor series, or something similar). You can define DC in a similar light; perfect DC will be the summation of infinitely high to low frequencies.

This is really a non-question. The very reasons to distinguish between DC and AC exist for other cases as well - such as impulses and switching.

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13y ago

What else can I help you with?