I am sure this is somewhere within this forum but the search engine is very lacking but I have become a little confused on the following....I am pretty sure the lower ohms like 1.5 drains the battery faster and normally is used at about 3.4v or so. My question is..the lower the ohms, the warmer the vape? The higher resistance the cooler the vape? Does the single coil, dual coil affect the warmer or cooler vape? P,ease give me the guidelines as I have 1.5, 2.0, 2.5 and 3.0 ohm cartos and juice may play a factor as to what resistance is better or worse? Please give me your general rules of thumb that you use when selecting resistance!! Thanks
Hello
The battery life is determined by the amps you're pulling. I changed the order of quadrants around on the wheel, but the formulae are all still correct.
P = power (watts)
V = volts
R = resistance
I = current (amps) I forgot why it's "I"
V²/R = P
4.5v²/2.2Ω = 9.2w
V/R = I
4.5v/2.2Ω = 2.05 amps
3.7v²/1.5Ω = 9.1w
3.7v/1.5Ω = 2.47 amps
Even though a 2.2Ω atty at 4.5v and a 1.5Ω atty at 3.7v are producing the same amount of watts (+/-), when vaping low-res the amps increase, which draws more from the battery.
I'm not sure with store bought devices the settings would make much of a difference in temperature (warmer or cooler vape), since 9 watts is 9 watts, but someone will probably correct me on this. Personally, I don't notice a difference. The lower resistance atty came into existence when most people only had cig-a-like and it gave them the ability to vary the power.
I never got into dual coils since a number of people (including Bad) had said they didn't seem to notice much of a benefit to the vape, and it seemed to burn the cartos out faster. The only thing I do know are some of the mechanics.
A dual coil carto consists of two coils of the same resistance. They are wired in parallel so the total resistance is half the resistance of either coil.
For example:
The total resistance of the 1.5ohm dual coil is 1.5ohms, but the resistance of either coil it contains is 3ohms. Both coils are actually 3.0ohms individually, together they are not 6.0, they are 1.5ohms
A 1.5ohm carto at 3.7V would be drawing 3.7/1.5=2.47 amps. But the single coil is burning at 3.7^2 / 1.5 = 9.13 watts, while each coil of a dual coil 1.5ohm carto is burning at (3.7^2/1.5) / 2 = 4.57 watts. You are spliting the power between the two coils.
Now this is where I get lost, since I don't know how to calculate the amps for dual coils.
As far as guidelines, I usually buy 3.0Ω cartos, 1.5Ω attys for the bottom-feeders and 2.8Ω heads (when I can find them) for the Protank, since I've found them to burn at lower resistances. I basically vape to taste and I know I like these through trial and error.
ETA: It occurred to me about the low/high-warm/cool question. My box mods are all 3.7v, so the only way to change wattage is to change resistance. When using one of those, a low-res atty has a warmer vape, since it puts out more watts. Maybe that's what was meant.
