Dual Coil Ohm Confusion
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Its electronics, there are different formulas for everything
It can make you real crazy
The formula for total resistance is different for series and parallel resistances
The formula for resistances in series is R1+R2+R3+...
The formula for two resistances in parallel is (R1xR2)/(R1+R2)
Or if the two resistances are equal then its simply R divided by 2
As my old electronics professor would say:
You just take the numbers and the right formula and "Plug and Chug"
It can make you real crazy
The formula for total resistance is different for series and parallel resistances
The formula for resistances in series is R1+R2+R3+...
The formula for two resistances in parallel is (R1xR2)/(R1+R2)
Or if the two resistances are equal then its simply R divided by 2
As my old electronics professor would say:
You just take the numbers and the right formula and "Plug and Chug"
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It can be explained even without any formulas (except Ohm's law, of course). Assume you have 3v battery and 3Ohm coil. On Ohm's law the amperage will be 3V/3Ohm=1Ampere. If two coils are in parallel 3V is applied to each and consequently each will conduct equally 1A. So 2A in total. If you would like to replace them with one coil conducting the same amperage, what resistance should it have? 3V/XOhm=2A. X=1.5 Ohm.
well look at it this way you have a subwoofer and it has a duel 4 ohm coil if you run it in parallel that makes it a 2 ohm woofer but you amp can only run a 4 ohm so you run it in series to make it 8 ohm to work will your amp
Or if there are more than 2 resistances in parallel...
1/(1/R1+1/R2+1/R3+1/R4+1/R5...)
1/(1/R1+1/R2+1/R3+1/R4+1/R5...)
I use the straw analogy for parallel resistance. Drink a milkshake through 1 straw, difficult....high resistance. Now add another straw. 2 straws means you have doubled the path for current, the milkshake, to flow. 2 straws is easier than one straw, effectively half the resistance.
Milkshake, a river and dam, even ping pong.
I used to teach basic electricity to kids fresh out of high school, most of them with no prior knowledge of electricity. So I had to get creative.
The only downside is that I was always so hungry when the class was over.
I used to teach basic electricity to kids fresh out of high school, most of them with no prior knowledge of electricity. So I had to get creative.
The only downside is that I was always so hungry when the class was over.
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So if I wanted to build dual coils for my RA and run it mostly on my eGo then I would need both of the coils to be 3ohms which would together give me 1.5ohms? 
Ron -
Ron -
Yes
But I don't think an eGo would be a good choice to power a 1.5 ohm dual coil atomizer
Its going to draw well over 2 amps
But I don't think an eGo would be a good choice to power a 1.5 ohm dual coil atomizer
Its going to draw well over 2 amps
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Milkshake, a river and dam, even ping pong.
I used to teach basic electricity to kids fresh out of high school, most of them with no prior knowledge of electricity. So I had to get creative.
The only downside is that I was always so hungry when the class was over.
That's how they teach it in college too. I still thing of voltage as pressure and amps as GPM (Gallons Per Minute). Try using that analogy on here and you get laughed at though.
Works perfectly to describe a battery, though; the capacity of the water tank equals the ma of a battery, the pressure at the base of the water tank equals the voltage of the battery, and the capacity of the pipe coming out of the water tank equals the mah of the battery.
The analogies are right. But…
It gets more complicated when you talk about power. If you're using the effective resistance (1.5Ω in this example) then the power you calculate ( P = IV = (V*V)/R ) is for the device. That power (like the current) is split between the two coils.
This has an interesting effect of being much more similar to vaping at half the power you think you're vaping at. It should produce vapor faster because there's more surface area contact between the juice and the heat source (because there are 2 coils) but the vapor will be much cooler and depending on exactly where it ends up the coil might take longer to reach sufficient temperature to vaporize the liquid.
I haven't done the experiment because I don't own a kick (let alone 2 with a pair of identical mods to put them in) and the math told me to avoid dual coils from the beginning.
I'd honestly like to see if someone can tell the difference blind between a single coil carto at 5W and a dual coil carto at 10W. I think at that point the difference should be noticeable……but it won't be at all as big as the difference between a single coil at 5 vs. 10 W.
I honestly think that's the reason people say things like "dual coils don't work on the Twist" or "the kick doesn't love dual coils".
Just for the Twist example, the most you're ever going to get out of a dual coil is 9.4W (2.5A @ 3.8V), split between the coils……which should be pretty close to 4.7W with a single coil. If I'm thinking about this the right way, that'd be like running a low-resistance Boge at ~3.1 Volts……which is weaker than disposable batteries…you would have changed to a fresh battery long before that.
So, in essence, you were "right" in your thinking for the wrong reasons. The important thing isn't how much power goes to the device (atomizer/cartomizer/etc.) but how hot the coils get. And that's related to the power in each coil, not in the device.
They just don't work (for what I and a lot of people seem to want) until you're up around 5 to 5.5V and are using a mod that can deliver about 4 Amps……which means either that a marketing team created them instead of a vaper or that they were intended to be used with stacked battery mods without regulators.
Unless I'm remembering it wrong, the Provari cuts off at 3.5 A, so even it won't run them to their potential.
It gets more complicated when you talk about power. If you're using the effective resistance (1.5Ω in this example) then the power you calculate ( P = IV = (V*V)/R ) is for the device. That power (like the current) is split between the two coils.
This has an interesting effect of being much more similar to vaping at half the power you think you're vaping at. It should produce vapor faster because there's more surface area contact between the juice and the heat source (because there are 2 coils) but the vapor will be much cooler and depending on exactly where it ends up the coil might take longer to reach sufficient temperature to vaporize the liquid.
I haven't done the experiment because I don't own a kick (let alone 2 with a pair of identical mods to put them in) and the math told me to avoid dual coils from the beginning.
I'd honestly like to see if someone can tell the difference blind between a single coil carto at 5W and a dual coil carto at 10W. I think at that point the difference should be noticeable……but it won't be at all as big as the difference between a single coil at 5 vs. 10 W.
I honestly think that's the reason people say things like "dual coils don't work on the Twist" or "the kick doesn't love dual coils".
Just for the Twist example, the most you're ever going to get out of a dual coil is 9.4W (2.5A @ 3.8V), split between the coils……which should be pretty close to 4.7W with a single coil. If I'm thinking about this the right way, that'd be like running a low-resistance Boge at ~3.1 Volts……which is weaker than disposable batteries…you would have changed to a fresh battery long before that.
So, in essence, you were "right" in your thinking for the wrong reasons. The important thing isn't how much power goes to the device (atomizer/cartomizer/etc.) but how hot the coils get. And that's related to the power in each coil, not in the device.
They just don't work (for what I and a lot of people seem to want) until you're up around 5 to 5.5V and are using a mod that can deliver about 4 Amps……which means either that a marketing team created them instead of a vaper or that they were intended to be used with stacked battery mods without regulators.
Unless I'm remembering it wrong, the Provari cuts off at 3.5 A, so even it won't run them to their potential.
There is more to it than just halving the power. While the electrical side is in parallel, the thermodynamics are in series.
I have found that I like about 50% more power with a dual coil cartomizer to be very similar to a single. 100% more power is a big difference between the them; being too hot, tasteless, and easily burnt if not topped off early.
I have found that I like about 50% more power with a dual coil cartomizer to be very similar to a single. 100% more power is a big difference between the them; being too hot, tasteless, and easily burnt if not topped off early.
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