The effect of resistance?

[bobrob]

The question: All other things being equal, does the resistance of a coil make a difference? Assuming I use the same watts setting on a variable wattage device? How? Does one have better flavor or more vapor than the other? Does one use the battery up faster?

The background: I've started to rebuild the coils for my Protanks. Sometimes I get a 2.4, sometimes a 1.7, sometimes a 2.0 reading on my ohm meter (and on my MVP 2) with the different rebuilds. Since I use variable wattage on the MVP, and I keep it set the same value (7.5 watts for me), the MVP automatically adjusts the voltage to get the right watts. So, if the voltage is adjusted automatically, the resistance shouldn't matter? (That is the question)

Related question: And if that is the case, why do people sub-ohm?

 

[Nathan Nowik]

yes on a vw it adjusts the voltage for you so it doesnt matter what resistance it is but a lower resistance coil will heat up alot faster than a higher resistance one

 

[bobrob]

yes on a vw it adjusts the voltage for you so it doesnt matter what resistance it is but a lower resistance coil will heat up alot faster than a higher resistance one

So what's the advantage of heating up faster? (sorry if that is a dumb question) Will a higher-resistance coil last longer ("the candle that burns twice as bright lasts half as long" kind of thing)?

Just trying to get a handle on all this stuff

 

[KenD]

In theory, a higher-ohm coil should mean more battery life. However, that really depends on the efficiency of the buck and boost circuitries of the mod. Some are more efficient at boosting the volts and some are more efficient at lowering them. The quality of the vape should be fairly equal whatever coil you use. If you don't notice any difference then all's fine. Sub ohm coils are usually used on unregulated mods. You can't change voltage, so you'll have to change the wattage by using a lower-resistance coil. I don't have a high wattage regulated mod so I can only speculate on those. How much you can boost the voltage is limited, so perhaps you need to build lower-resistance coils to reach high wattage (if the mod can only go as high as 6v then your coil can't have a resistance higher than 1.2 to reach 30w. 0.83 if the mod can only go as high as 5v).

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[dice57]

the lower the resistance the more amps are drawn, and the faster one uses up stored charge. Faster heat up comes at a price. I'm willing to swap out batts daily, to vape high watts, but it's all a balancing act for optimal Vape.

 

[Bunnykiller]

sub ohming allows a user to achieve a higher watt level than what is allowed for most VV/VW units... for example: a .5 ohm coil at 4V will give 32 W ( 4X4=16 16/.5= 32 Vsqrd/R) as to where a 2 ohm coil would need 8V to be the same in power (W) ( 8X8 =64 64/2 =32)

as far as higher ohms and lower ohms resulting in better battery life... that all depends on what watt rating you need.
Higher resistance reduces current flow thus making a battery last longer but it also reduces the amount of watts thru the coil ( thats why the battery lasts longer)
lower ohm wire/coils allow more current to flow which allows for a faster coil temp increase ( and as wire becomes hot, its resistance increases even more) in effect you can start off with a .700 subohm coil and heat it up and it would climb in resistance to possibly .720 and wire gauge ( thickness) also plays a part in temp changes over time ( milliseconds)

 

[V4peEscape]

lower ohms = More vapor.

Are you using pre-built coils or custom coils on a RBA/RDA?

 

[bigdancehawk]

Resistance is futile.

 

[bobrob]

lower ohms = More vapor.

Are you using pre-built coils or custom coils on a RBA/RDA?

Rebuilt Kanger coils on my Protank2. (The Kayfun Lite+ is in the mail though!)

 

[KenD]

lower ohms = More vapor.

Are you using pre-built coils or custom coils on a RBA/RDA?

Not on a regulated mod in wattage mode (or in voltage mode if you increase the voltage to compensate for higher resistance).

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[Dampmaskin]

The question: All other things being equal, does the resistance of a coil make a difference? Assuming I use the same watts setting on a variable wattage device?

No. All other things being equal (except voltage and current), resistance does not make a difference.

However, all other things are rarely equal. For instance, you mod might be more power efficient increasing the voltage to match a higher resistance, than decreasing it to match a lower resistance. Or it might be the opposite.

Coil heat-up time depends on the heat capacity of the coil, which is closely related to its mass. So if the heat capacity is equal, the heat-up time will be equal, regardless of resistance.

In reality, a low-res coil often has a shorter wire than a high-res coil, leading to lower heat capacity. OTOH, a low-res coil often has a thicker wire than a high-res coil, leading to higher heat capacity.

The surface area of the coil also plays a role in the vape quality. As the surface area is also a product of the length and thickness of the wire, those variables will show up at least twice in this "equation". But because none of them are directly related to resistance, the answer is still "no".

 

[p7willm]

Your best bet is to see if YOU can tell the difference. If not it does not matter. If yes then use what you like most. You might also find that you like different resistance, or wattaghe, for different juices in different attys. Part of the fun, for me, of vaping is figuring it all out.

I have gone through a bunch of different stuff and have found I like some more than other and that I like some juices in some more than other and I am still trying new things.

Not to mention, please don't mention it, looking for the perfect juices. God help me when I start making my own juice.

 

[m1911]

Im lost.....

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[kon666]

I saw some one was rebuilding coils.I've been doing this since I bought my first disposable cartos.but I was wondering if anyone had experience with no resistance wire because I've been running into the problem of the insulator burning and that is with out dry burning. How or what do the manufacturers use to brake these. I basically want to replicate these but with kanthal if possible

 

[tlag77]

Im lost.....

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I was lost right at the beginning.

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[m1911]

I was lost right at the beginning.

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For a minute there I thought I was in a physics class

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[tlag77]

For a minute there I thought I was in a physics class

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There is definitely alot to learn to all this vaping thing, lots of numbers and jargon I just don't understand yet. Oh well, that's is what this forum is for I suppose.

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[m1911]

There is definitely alot to learn to all this vaping thing, lots of numbers and jargon I just don't understand yet. Oh well, that's is what this forum is for I suppose.

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I actually made 2 calls today to 2 friends of mine who are 'geniuses' in electronics to ask about the corellation between resistance, volt and watt.....now I have to go look for friends who are chemists to ask them about PG VG.

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[tlag77]

I actually made 2 calls today to 2 friends of mine who are 'geniuses' in electronics to ask about the corellation between resistance, volt and watt.....now I have to go look for friends who are chemists to ask them about PG VG.

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My stepdad is a chemist. Might have to call him.

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