Ohms Volts and Watts....Variable Volt beginners view.

[Lost Boy]

Hi all,

I am finding that my 3.7volt devices work best for me with low resistance (1.5 - 2ohm) cartos.

My Lava Tube does not like dual coil cartos as the upper coil dries an burns. A single coil works a lot better. (Kanger)

To work out the watts (heat at the coil) volts x volts / ohms (3.7v x 3.7v / 1.5ohm = 9.13w)
(4.2v x 4.2v / 2.2ohm = 8.02w)
The Lavatube will not operate above 2.5amps.....so to work out amps divide volts by ohms (3.7v/1.5ohms=2.46amps)
(4.2v/2.2ohms=1.91amps)

The highest wattage I could theoretically obtain would be with a 2.5ohm single coil cart at 6volts
6v x 6v / 2.5ohms = 14.4 watts!!! at 2.4amps (6v/2.5ohms)
however the Lavatube in reality will not go much above 5.2 volts under load so.....

5x5/2.5= 10.82 watts in real terms.

A friend of mine has a Pro Vari which has a fantastic feature allowing you to test the resistance of any carto/atty attached to it.....the Kanger SR i have on the go right now is 2.2ohms and runs beautifully from 3.7 to 4.2 volts but gets a bit too hot for the thick VG cherry i am vaping right now.....

I hope these findings and my very basic understanding of the maths help someone.....

 

[DCB305]

One can also look up an ohm's law calculator.

 

[Horseman9]

Nice Job, good info - Hope lots of people read this - thanks!

 

[Horseman9]

One can also look up an ohm's law calculator.

Too many lazy or non-mathematical people to hope for that, might get 10% who would

 

[Bawn]

Your amp calculations work however with a 3.0ohm at 5.5 is pushing 1.85 amps however 5.5 is the highest you can go on a 3 ohm carto. With a 2ohm carto you can hit 4.8-4.9v which equals 2.5 amps. Weird

 

[Lost Boy]

Nice Job, good info - Hope lots of people read this - thanks!

Thank you

 

[tj99959]

Being the slothfull type that I am I just let this do the math for me Ohm's Law Calculator

Once you know the wattage that you like best it is easy to match ohms with the proper voltage. (or voltage with the proper ohms)

 

[Lost Boy]

Your amp calculations work however with a 3.0ohm at 5.5 is pushing 1.85 amps however 5.5 is the highest you can go on a 3 ohm carto. With a 2ohm carto you can hit 4.8-4.9v which equals 2.5 amps. Weird

Ah...yes...erm, the weird bits I cannot explane...but if it tastes BAD......turn it down a bit! lol

 

[Rule62]

There are several Ohm's law calculators you can find online. One of my favorite features of the Provari is the ability to read carto resistance. I like to vape usually at around 6.5 watts. I check my carto resistance whenever I change them, and set my voltage accordingly.

 

[Lost Boy]

Being the slothfull type that I am I just let this do the math for me Ohm's Law Calculator

Once you know the wattage that you like best it is easy to match ohms with the proper voltage. (or voltage with the proper ohms)

Fantastic!!! Just found one on android market......Thanks, I have always just frantically tapped on my calc or done it in my head when losing sleep! lol

 

[Keekers]

*Please ignore any title you may see under my name*

What?! Oh wow. I want to look into a VV REO and I don't really understand the concept. I know you turn the knob until you get a flavor you like but I'm confused as to how this works without killing the atty/carto/battery.

 

[lassep]

Just cant wait to get my VMAX and play with the volts!

 

[elfstone]

I can push my 3.0 Ohm carto to 6 V on the ProVari. It tastes like sucking on coal, but it works. Now I just hope I didn't burn the carto for good

 

[Rule62]

I can push my 3.0 Ohm carto to 6 V on the ProVari. It tastes like sucking on coal, but it works. Now I just hope I didn't burn the carto for good

Yep, I didn't get a Provari so I could see how hot I could vape. Usually a 3.0 ohm Fluxo is about right for me at 4.3 or 4.4V