Calculating amp draw on Hexohm 3.0?

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I know it's basically a regulated mod with a POT for VV rather than buttons for VW, but I'm still not quite sure how one would go about calculating amp draw. If it does work like any old regulated mod, would that mean that I'd need to use the set voltage and resistance to calculate wattage and use the wattage to determine how much current is coming from the batteries?

Calculating amp draw on Hexohm 3.0?