Lets talk Ohms...

[JohnWillyson]

Okay. Heres what I understand.

Standard resistance is ~3.0 ohm. LR (low resistance) is 2.5ohm or lower. Lowest is 1.5ohm.

Higher Voltage = more vapor, warmer vapor.
Lower ohm = more vapor, warmer vapor.

Now I have an eGo-C, with SR attys. So I am doing 3.4volts on 3ohm. I hear 1.5 ohms can kill an ego battery.

Higher voltages, want higher ohms to cancel out some of the effects? I just dont understand how this works...

Can someone help me out in-depth, or point me to a thread that goes over this all?

 

[sweetz]

think of it like a see-saw. On one end are your ohms, on the other end, your voltage. Go too high on one end, and two high on the other, and nobody's having fun cause you're sitting level. Too low on both ends, and the see-saw breaks. Extremely high on one end and too low on the other, and you fall off. LOL

You've got to play at balancing higher one end, lower the other, to find the tilt you like

Yep. That's my metaphor, and I'm sticking with it. Cause today I got a High voltage device, plugged in a low ohm atty, and popped my see-saw

But please trust that I'm no expert, I'm still finding that balance myself! This is just what made sense to me.

 

[funrotor]

http://img694.imageshack.us/img694/469/wattage.png

It's all about finding your sweet spot for your ejuice. I prefer ~ 7 watts on ~4.8 v

 

[Shadow102]

Well when you break it all down, what we're really looking at is the heat or power output of the atty in terms of watts. Everyone has a sweet spot, personally I like around 8-8.5 watts for most of my vapes, stepping down to 6.8-7 watts for some of the sweeter ones (chocolates don't taste right to me at 8 watts.)

That being said, the internet gives us wonderful tools to estimate the watts we're getting from our PV's. Like this one: Ohm's Law Calculator

When people mention how LR can kill some of the smaller batteries (like the proprietary ones in Ego's, slim 510's or 808's) it is the amperage draw exceeding the discharge rate of the batteries that can damage them. This is also evident when using LR equipment with protected LiIon batteries that lack the C rate to handle the current draw.

 

[hairball]

Lowest ohm is 1.25.

Rules can be broken. You generally aren't suppose to be able to run LR at higher voltages but dcc's break that rule. Yes, LR can and will kill an ego faster than SR. High voltages will weaken the coils faster and cause, even SR, to pop faster than normal.

 

[throatkick]

Took a break while typing.... already answered above.

Most are happy betwen 7-9 watts

 

[tj99959]

Once you know your sweet spot you can use an Ohm's Law Calculator to figure out how to get there.

The deal is that we deal with small voltages and small resistances, so a little makes more of a change than one would think.

 

[jonny2hottie]

found this somewhere...hope it helps

 

[Off Topic]

As if things were not complicated enough, consider the dual coil effect.

Right now I'm running 1.5ohm dual coil carto on a 3.2v ego. From the battery's perspective, I'm running 1.5ohms. From the individual coil's perspective I'm running 3ohms. So in this configuration, I'm getting double the vapor volume at a lower temperature.

If I run a 1.7ohm single coil, I get a much hotter vape, but less vapor density.

 

[Currynoah]

Check out my signature, courtesy of Biffrocko. Make understanding the process much easier!!

 

[JohnWillyson]

Oh boy. So this is why people want variable voltage...

 

[dormouse]

Slim ecigs us standard resistance.

You can use 2 ohms on Ego. Even 1.7 is probably OK. 1.5 has a chance of damaging battery. The voltage of Ego could work with lower but the quality of the electronics in mass produced encased batteries sometimes cannot handle the high amps pulled by very low LR stuff. A couple of people have had the switch button melt and the battery get stuck on which is hot, dangerous and scary. Many will only go as low as 1.5 on mods. Mods can better handle putting out more power at once and if you do damage a mod battery they are only $5 or so and you have spares.

The labeling of cartos/attys as LR is relative to 3.4 to 4.7 ohm devices. Something labeled as LR (would be under 2.5 ohms) will be hot on those batteries. So a 2 ohm atty would be LR. But on a 6v mod, a 2ohm atty is TOO low and may just pop. For other voltages, what is LR and what is SR moves up in ohms depending on the volts of the battery. A 3 ohm atty is SR on 3.7v and not very warm, but is LR for 5v and is hot on 5v.

 

[TheTrulyInsane]

Awesome info, thanks guys!

 

[george7009]

I vaping in 3.7 volts and 7.4 volts kai i use the ohms calculator and make resistance at 10 watts .
I using GGTS with Odysseus tank from IMEO .
Is OK ?

 

[Hoosier]

Oh boy. So this is why people want variable voltage...

Exactly!

Now that this thread has been very helpful and full of great info, can we get into conductance or Mhos?

(Ugh, yeah, anyone who has suffered through bad jokes from the professor in electronics will groan too.)