I don't totally agree. In order to get higher voltages at the carto, more current must be drawn from the battery. Knowing ohms law, and setting the different cartos for the same power will (aside from the voltage boost circuits efficiency) draw the same average amount of power from the battery. The difference , I believe is the heat is spread out across more turns of wire, or in the case of DCC's across two separate coils. For example, say we have 3 cartos. a 1.5, a 3.0, and a DCC 2.0. and all are made with the same size wire. And we drive all of them to 8 watts. And for this example lets assume the 1.5 has 3 coils, the 3 ohm has 6 coils, and the 2 4's in the 2 ohm dcc have 4 each. Now the 1.5 heating element is the shortest of course, and has all of the power (heat) in a very small area. And the opposite end of this example, the DCC 2 ohm not only has longer coils, but 2 of them. A total of 8 turns, laid out in different areas of the carto, thus heating more e-juice, but not as hot in a small area as the 1.5. I believe this would have an effect on the vapor, as well as the taste. What I have also found, is the LR cartos having higher heat in a smaller area tend to get that burnt taste sooner. And in the case of the DCC, the hear is spread out across more coils and can be cranked to more wattage total before getting that burnt taste. Looking at the limits of the ProVari, 2.5 amps, and 6.0 volts, we can calculate the best carto resistance for the highest power, and it comes out to 2.4 ohms. which does make the 2.5's the best you can get for the most output. And dual coils allows you to spread the heat across more area. IMHO....
First, you don't need more turns of wire, just a different gauge of wire. 28AWG rather than 32AWG, for example, to increase the resistance. Lower gauge wire also means hardier wire that can stand up to more punishment at higher voltages.
More importantly, there seems to be some confusion here about how current and resistance works.
First, you have to understand that electricity wants to get from point A to point B by the most efficient means possible -- the path of least resistance, as you're taught in first year Electronics. (Or at least, we were in high school.) Second, you also have to understand that, for electricity flowing through a conduit, heat is actually a waste product. It's energy lost to the current's attempt to make it from A to B.
The key word in the above paragraph is
resistance. The lower the resistance of the conduit, the smoother the ride for the electrons travelling through it. No resistance wire (which is used in making some coils) has, as the name suggests, no resistance. (Well, it does, just very little; to get absolutely no resistance you need a superconductor.) Electrons just shoot through that stuff like greased lightning. (Bad pun. Terribly sorry.) But when you raise the resistance, the electrons have a harder time getting from A to B -- the conduit is
resisting the electrons' attempts to get from one end to the other. In doing so, the electrons lose energy. Where does the energy go? It's lost as heat.
So
low resistance atties and cartos provide
low resistance. (said Captain Obvious.) Meaning electrons shoot through those things pretty easily, which means not a lot of energy is lost as heat. But for our purposes, we
want heat, and the only place we can get that is by pulling more power from the battery. (Technically that's not correct; they don't exactly pull power, they complete a circuit that lets the battery
push power to the carto. But that's not really important here.) More electrons being shoved through that low resistance wire at once creates more heat.
Problem is, that's not a very efficient way of making heat. If you raise the resistance, you need to draw less current to produce the same heat because the higher resistance wire makes it much harder for the current to make it from A to B, which means a lot of energy from the electrons making that more difficult journey is lost as heat. However, it takes less current from the battery to produce the same heat through higher resistance wire than it does through low resistance wire -- you don't need as many electrons being shoved through the wire at once because making the trip more difficult for them is more efficient at making them waste energy (and therefore create heat) than trying to pack more of them through a path of low resistance at once through increased current.
I hope that made sense.
