This is not the right thread but i must ask...
I always have in mind that lower resistance means higher temperature. This is not correct? These days i try higher coils (2.4-2.6) than my usual (1.5-1.8Ohmc) at the dripper and as i am not a very advanced user cannot see much difference. Just play a little with the watts.
The answer is -- it depends! Resistance is simply a descriptive property of a given coil, but a given resistance can be achieved in different ways, which will behave differently. In general, resistance wire takes more current to reach a given temperature the larger it gets:
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So, if you achieve a lower resistance by shortening the coil, you will raise current but keep the wire size the same, therefore you will get higher temperature. If you achieve lower resistance by increasing the wire size, you will raise current and raise the amount of current it takes the wire to heat.
Looking at the chart, let's say you have a 32ga coil at 3 ohms, set at 3.7v. That gets you 1.2a, 4.6w, theoretically capable of 1600 degrees in open air (our juices are coolants so in the atomizer this is a far lower number, unless you run out of juice, which is where the burnt tastes comes from). Shortening that coil to 2 ohms, 3.7v is 1.85a, 6.84w, over 2000 degrees in open air.
However if you raise the wire size to get the reduction in resistance ... let's say you go to a 28ga coil at 2 ohm. The 1.85a is only good for ~1300 deg. in open air. So you have actually have to go to 1 ohm to achieve the same 2000 degrees capability with 28ga.
Now, the other half of the equation is that larger wire size means larger surface area, which means more area of contact with the wick. In order to do subohm builds, you generally need to raise the wire size significantly. So you are vaporizing more liquid at once with a larger wire coil, hence the larger clouds.
This is also why a dual coil tends to take more power and produce more vapor than a single coil of the same resistance.
So lets say a coil at 1.2 ohms at 12 watts (3.8 volts) does not produce higher temperature than a coil at 2.4 ohms at 12 watts (5.36 volts) ?
I actually have this exact setup going on right now with two separate EVOD clone heads. One is a stock head at 2.4 ohms (32-34 ga) and one is a rebuilt head at 1.2 ohms, 30 ga. If I run both at the same wattage, the 2.4 ohm coil gets hotter in all cases. I get full vapor performance from the 2.4 head at about 11w, whereas at that wattage the 1.2 ohm head makes a weak vape. I can crank the 1.2 ohm head to 18-20w at which time it makes much bigger, thicker clouds than the 2.4 head at 11w. If I run the 2.4 head at 18w+, it burns the juice.