A (bipolar) transistor is a variable current source. There is nothing more complex about building a variable current source than building a variable voltage source. It is variable power that requires you to measure the load and control one of the others to produce the right power.
There is a VA device out there right now, the Talifun Eye.
The answer to the OP's question was given on the third page. It is possible, although unusual to create a high resistance build that vapes the same as a low resistance build when fed the same power. But in order to truly understand it, you need more than ohms law. You need
Kirchhoff's circuit laws - Wikipedia, the free encyclopedia as well.
Let's build three identical one ohm coils. Let's also say we have an accommodating dripper where we can wire these coils into either series or parallel configurations without changing the wicking or airflow. That's not impossible, but it might be a challenge.
When we wire them in parallel and feed them with 3V, all the coils have 3 volts across them. We can do ohms law for each in turn and find that they each take 3 amps. By Kirchhoff''s current law, we can see that the mod is having to produce 9 amps, and 9 x 3 = 27W. However each of the coils is seeing 3 x 3 = 9W. There are three coils, so 9W+9W+9W = 27W.
Now let's wire the coils in series. In this case the same current is going through all the coils. There's nowhere else for it to go. Let's say that that current is 3 amps. By ohms law, we know that the voltage across one coil will be 3 volts. Kirfchhoff's voltage law tells us that if all the three coils have 3V across them, then the mod must be putting out 3V+3V+3V = 9V. So the total power is 9V x 3A = 27W. However each coil is still seeing 3V and 3A and is still producing 9W.
So whether they are in series or parallel, each coil always sees the same voltage and the same current. If the individual coils are all seeing exactly the same voltage and current in both situations and if, as we stated earlier, the wicking and airflow is the same, then the vape will be
identical between the two situations.
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Variable Current control has one major advantage. If you are building coils with the same type and gauge of wire, then the same current setting will give you the same power per millimetre, the same power per mm2 (of surface area) and the same power per mm3 (of wire).
If your wicking and airflow are efficient, then you can use the same current setting no matter how big or small you build your coil.
Most people, I think, use only a small handful of different sizes of wire, mostly of the same type. It would be simple to remember that for 28AWG Kanthal I like, say, three amps, but for 30AWG I prefer two amps.
