why do dual coils have half the resistance?
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You're adding in another route for the electricity to take, so instead of one wire it has the two, and they'll split the load. At least the best of my understanding.
Yep, Ohm's law.
One thing to note is that since its half the resistance while essentially doubling energy output, it will drain your battery faster.
One thing to note is that since its half the resistance while essentially doubling energy output, it will drain your battery faster.
I've personally never found any great benefit to dual coil. If anybody has mind putting down your thoughts? I only tried one thus far in my vaping career (EMDCC, which I don't see anybody mention these days) and I never seemed to get decent performance from it.
The one that you looked at is most likely a dual coil run in parallel if it's (2) 3.0 coils that end up being ~1.5 ohms. I've only seen one of these so far, link below.
eSmokeClub - Cartomizers - Joye 510 - DUAL COIL - MEGA Refillable - Multipack
Most of the one's I've see have (2) 1.5 ohm coils run in series. When it's series you add the two together to get 3.0 ohms. Below is a good explanation of parallel vs series.
Series and Parallel Circuits
eSmokeClub - Cartomizers - Joye 510 - DUAL COIL - MEGA Refillable - Multipack
Most of the one's I've see have (2) 1.5 ohm coils run in series. When it's series you add the two together to get 3.0 ohms. Below is a good explanation of parallel vs series.
Series and Parallel Circuits
Think of it this way, you are opening up another pathway for current to flow and therefore there is less resistance. Of course with less resistance comes more current, and that means more power used.
To make it simple, think of it as adding another lane on a highway.
To make it simple, think of it as adding another lane on a highway.
I have never even tried them thanks to all the bad reviews on here.
Its like the headlights on your car, they also run in parallel, and very similar electrically to how an atomizer functions. Lets make up an ohm amount of 2.0 per headlight for this example.
If you run one headlight at 2.0 ohms you use a certain amount of power.
2 headlights in parallel (2 circuits) which would be like above at 2.0 ohms per circuit, and you use twice as much power from the battery because each circuit is independent of each other.
2 headlights in series (only 1 circuit total), and you use the same power as 1 headlight with each headlight half as bright. This one circuit runs at 2.0ohm + 2.0ohm = 4.0ohm.
Hope this helps.
If you run one headlight at 2.0 ohms you use a certain amount of power.
2 headlights in parallel (2 circuits) which would be like above at 2.0 ohms per circuit, and you use twice as much power from the battery because each circuit is independent of each other.
2 headlights in series (only 1 circuit total), and you use the same power as 1 headlight with each headlight half as bright. This one circuit runs at 2.0ohm + 2.0ohm = 4.0ohm.
Hope this helps.
Resistance is analogous to water flow. If you use one 1/2" garden hose you experience the resistance to water flow of that one hose. If you install a Y adapter the water now has twice the diameter (4 times the cross sectional area since A=Pi * R^2) to flow through and you can put twice as much water through the two hoses as one. Resistance to flow is halved at the same pressure (voltage).
The main advantage of dual coils is contact area with the juice. Two coils atomize twice as much juice per draw (theoretically).
The main advantage of dual coils is contact area with the juice. Two coils atomize twice as much juice per draw (theoretically).
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Dual coil cartos are two coils run in a parallel DC circuit. The effective resistance of any parallel DC circuit is simple, it will always be the reciprocal of the number of resistors(or coils for vapers) in the circuit (2 coils will be half the resistance, 3 coils will 1/3 the resistance, 4 coils will be 1/4 the resistance, ect., you get the idea.) A 1.5 ohm dual coil is two 3 ohm coils in parallel, a 2 ohm dual coil is two 4 ohm coils in parallel, ect., you get the idea.
If you had two 3 ohm coils in series, then you add the resistance of each which would give you 6 ohms total.
Originally Posted by Thompson
I've personally never found any great benefit to dual coil. If anybody has mind putting down your thoughts? I only tried one thus far in my vaping career (EMDCC, which I don't see anybody mention these days) and I never seemed to get decent performance from it.
There is a reason why many do not like dual coil cartos, I am one of those people. Each one of the coils gets half of the current (amps) and produces half of the power (watts) in a parallel DC circuit. So with a 1.5 ohm dual coil set at 4 volts, you will have 2.67 amps of current, 1.33 amps to each coil. The power for this circuit will be 10.67 watts, but only 5.33 watts per coil. And herein lies the problem with dual coils for VV or VW devices, amp limitations. Most of these devices have 2.5 to 3.5 amp limits. If you have a mechanical mod that doesn't have amp limitations and a fresh battery with 4.2 volts, a dual coil will give you a lot of power, but not in a VV/VW device.
I have never seen dual coil cartos in series, not saying there aren't any, I've just never seen them. I can't think of a good reason to have dual coils in series as this will increase the voltage needed to produce the power needed for a satisfying vape. Also if one coil pops, then the carto is dead, in parallel, if one coil pops, no problem, you now have a single coil carto.
Parallel DC circuits are only one circuit, not two, it is just a different type of circuit than series. You have a beginning (positive terminal) and an ending (negative terminal) in both parallel and series circuits.
Thompson said:
SoberSnyper said:
Both of you bring up very good points. I began using dual coil cartomizers because that was what came in my first DCT tanks. Ignorant me, I assumed that was what was supposed to go in them so I always bought more as replacements. (Way to go Smoktech. Clever way to create a use for a new product line that wasn't needed in the first place.
)Anyway, I often got a burnt taste after using any dual coil in my tanks for a period of time. I didn't believe I was having a wicking issue in the carts, as I was using two holes in the cartomizer and my juices were a common 50/50 pg/vg mix. Then I saw some people were using single coil carts in their DCT's. Hmmm, what a novel idea! Let me try that.
Long story short, I switched out several of my dual coil carts to single coil carts. Same brand carto, same ohm rating, same number of holes in the cart, same juices. Result? Same flavor, same amount of vapor, smoother vape, longer battery time, and best of all no more burnt taste after short term use.
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Theory: Click on the below image to enlarge the detail. We all know that even when we fill any cartomizer correctly, within a few minutes the top of the polyfill will appear dry. This is normal and unavoidable. This is because the act of vaping and suction in the airhole causes e-juice in the polyfill to be pulled from the top of the polyfill down to the heating coil in the bottom of the cart.
The second coil in a dual coil is located approximately in the mid-third of the cartomizer. After a few minutes of vaping, unless you frequently "top off" your dual coil carts, that upper coil is not going to be getting as much juice as the bottom coil, and may actually burn the pollyfill or wick around it, resulting in the burnt taste I was experiencing.
Even in a perfectly wicking dual coil cartomizer in a cartotank, that upper part of the polyfill is going to go dry. Adding a punched hole higher in the cartomizer defeats the purpose of negative pressure in the tank, because as the juice level drops in the tank it is replaced by air (the air bubble that you see each time you vape) and the top hole will eventually be sucking more air into the upper polyfill instead of more juice.
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Because DCC's gather up all the little electrons, and send half of them down one fork in the road, and the other half down the other fork in the road.
I can understand why many like DCC's, but now there are other alternatives that make the technology dated. They are probably a device that will go the way of the old cartridge.
I can understand why many like DCC's, but now there are other alternatives that make the technology dated. They are probably a device that will go the way of the old cartridge.
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Exactly what I deduced last year after trying the dual coils in a couple of configurations (including the carto tanks) and being less than pleased with them. It stands to reason, really. Oddly, someone told me about punching two holes (for carto tank use) vertically..one above the other. There is a logic that says that that wouldn't be good because of "sucking air" when the tank is low. Another logic says "yes..it'll suck some air when the tank gets low, but it keeps the juice feeding the coil". Or something like that. Not sure, but I do know that I've had surprisingly good results using the two-hole-in-vertical system. My cartos last a shockingly long time. I am able to drain the juice out of the tank vaping if I want to (rarely do though...usually top off before it's empty) The top hole is still well below halfway down the carto...only a couple of mm above the bottom hole. Don't know why it works really. But it does, so I'm sticking to it!
I remember that you punch your carto's in this way. In fact, someone PM'ed me about carto punching techniques and I referred them your way, as I only use laser-drilled carts in my tanks. My reason for this is in my blog articles. People can find those in the link below my avatar.
I think it works for you because the upper hole is still low enough that you wouldn't be sucking any air into the carto with low juices levels in the tank.
I was thinking more along the line of the people who punch a hole up high on the carto to keep the upper part of the polyfill wet. I would think that might work well if you have a tank that uses a juice fill hole and could frequently top off the tank to keep it relatively full. I've never used those type of tanks so I've never been able to test that out. But theoretically that's about the only way to keep the entire polyfill saturated with juice.
I'm looking forward to the future when perhaps we might see some type of "juice injection", not unlike fuel injection in cars, to feed the heating coil in our juice delivery devices for our APV's.
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