You need have a basic understanding of voltage, current, and resistance before looking into variable anything devices. All theories of nature include the flow of electricity along a copper wire. Imagine it like water flowing through a pipe how quickly the current is moving is (measured in amps). Even yet, all cables have some resistance to them, which is measured in ohms across a large pipe (low resistance) and less so through a tiny pipe (high resistance). Regardless of how large the pipe is, consider this. Note: Sub-Ohm vapors. The skill you’re putting to this is the way water flows when voltage is applied. Consider the pressure inside the pipes.

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