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I know this is a very novice question, but I can't find anything in lay person's terms.
You can think of VV like a Dimmer Switch on a Lamp. When you turn the Dimmer Switch up, you give the Lamp more Voltage. So the Light gets Brighter (Hotter).
The same this happens when you turn up the Voltage on your SVD. You give the Tank/Clearo/Atty more Voltage so the Tank/Clearo/Atty runs Hotter. Hence more Vapor and More Flavor.
Volts, Ohm and Amps are tied together in a Dance given by Ohm's Law: Amps = Volts / Ohms.
Watts is a Measure of Power. And with a little Algebra, the formula can be derived from Ohm's Law
Watts = (Volts x Volts) / Ohms.
So for a given Voltage that you have your SVD set at, say 4.4 Volts, and for a given Ohms (Resistance) your Atty/Tank/Clearo is, say 2.5 Ohms, you can calculate the Power in Watts that is being produced.
Watts = (4.4 x 4.4) / 2.5 => Watts = 7.75
What a VW device does is adjust the Voltage to keep the Watts the Same no matter what Resistance (Ohms) Tank/Clearo/Atty you put on your SVD.
So in theory, you should get the same hit Basically with what ever you put on you SVD when you are in VW mode Without having to adjust anything.