Yes and no. It depends on the design of your topper. You're not going to be happy if the 0.3 ohm coil is going into an Evod for example. Power is more closely aligned with temperature than voltage.
Why do VW devices even exist?
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I imagine the next concept will be an adjustable Amperage device. It will allow you to put in lower resistance coil (smaller surface area I'm assuming) and will automatically lower the voltage and therefore wattage linearly maintaining a similar surface area to juice temp.
Circumference being =2*pi*R the geometry would lead me to think a constant current device might excel at maintaining a surface temp from similarly guaged wires, or changes in # of wraps with similar wire.
However
Resistivity = rho/A (A is cross sectional are and in a circle is squared) might lead me to believe that the variable wattage device maintains surface area temperature more constant when going from one gauge to another when keeping the wire length the same.
And
VV will not maintain any constant temp between coils in fact it may emphasis the changes and will require you to adjust.
Of course who knows how the wick and juice will behave relative to surface area contact... argh their's really no difference in the end, the point is you can adjust to your liking... That's why VV and VW devices exist.
disclaimer: I left out a few variables ex; Length because it's linear with resistance.
Circumference being =2*pi*R the geometry would lead me to think a constant current device might excel at maintaining a surface temp from similarly guaged wires, or changes in # of wraps with similar wire.
However
Resistivity = rho/A (A is cross sectional are and in a circle is squared) might lead me to believe that the variable wattage device maintains surface area temperature more constant when going from one gauge to another when keeping the wire length the same.
And
VV will not maintain any constant temp between coils in fact it may emphasis the changes and will require you to adjust.
Of course who knows how the wick and juice will behave relative to surface area contact... argh their's really no difference in the end, the point is you can adjust to your liking... That's why VV and VW devices exist.
disclaimer: I left out a few variables ex; Length because it's linear with resistance.
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This The point of VW is to simplify vaping. Wattage, as noted, is more directly related to the observed performance so while one may find themselves making a similar number of adjustments from atomizer to atomizer as with VV, the magnitude of the adjustments is lower and the predictability of results is greater with VW.
This is also correct, however it is worth noting that kanthal has a relatively low thermal resistance variance.
You are correct that both types exist. Clones and Yihi chips are the first type, the DNA is the 2nd type. Not sure about other chips.
I can't believe this post went by and people are still blathering on about volts versus watts when there is a much bigger mystery out there. You had a 66 VW Van and sold a 66 VW Van? What the hell happened? Were you in some sort of life or death situation and were forced to sell it? Was your daughter TAKEN and you needed the money to fly to France? Were you on a plane with snakes and the only way not to release them was to sell the van? Was it accidentally driven into a volcano in Mordor by Gollum trying to steal it from Frodo?
Some people just like to figure things out, like the person who designed Volkswagen Beetle... Hitler... then start a war. haha
In 1980 my parents gave me their 1962 23 window when I got my license. If I'd known some day it would have sent both my kids to college, I would have hung on to it.
VA is an interesting idea.
I have a spreadsheet showing that, given the same wire gauge, power per square millimetre of surface area is proportional to power and to the square of the voltage.
https://dl.dropboxusercontent.com/u/96640124/Coil Efficiency.xls
That is just one of the several variables that we have to juggle. The cubic millimetres of wire will affect how quickly it heats up. The wicking efficiency and shape of the coil will affect how much heat it can deliver to the liquid for a given coil temperature.
- Given the same gauge of wire, a VA device will deliver the same power per millimetre of wire, no matter what the coil resistance. But a different wire will require a different setting for the same effect.
- A VW device will produce the same amount of total heat, no matter what the resistance and size of the coil. But a larger coil in reality requires more heat than a small coil.
- A VV device will produce the same power per coil, no matter how many are connected in parallel. But different sized coils require different settings.
I have a spreadsheet showing that, given the same wire gauge, power per square millimetre of surface area is proportional to power and to the square of the voltage.
https://dl.dropboxusercontent.com/u/96640124/Coil Efficiency.xls
That is just one of the several variables that we have to juggle. The cubic millimetres of wire will affect how quickly it heats up. The wicking efficiency and shape of the coil will affect how much heat it can deliver to the liquid for a given coil temperature.
I just adjust the settings to whatever works for me. One device is set on VV and the other only does VW. Have the same tanks on each and they both vape the same. So to me, it doesnt matter, as long as it can be adjusted some how.
A 0.5 ohm coil will generally be made with thicker wire than a 1.8 ohm coil. That changes the wire mass, wire thickness of course and surface area of the coil and all of that will make the two coils vape different.
A manual transmission works just fine too... So why are all the cars automatic?
Because with the 1.8ohm you'd have to run at a higher voltage to get that 30watts.. One that your mod might not be able to deliver. Higher voltages also tend to burn the juice faster. Also, consider, that most 0.5ohm coils are actually dual coils made with bigger, lower resistance wire, giving you more surface area. There are many factors involved. Its not just ohms and volts.
You'll get used to the trigger topics here. VV / VW is one.
Next time you should make a thread about how Provaris are long in the tooth or how you feel about public vaping and cloud chasers.
Just kidding, it's an interesting discussion so far...
this would be on a 30 watt vw device I can buy the surface area maybe but I'm not sure if my juice would burn faster if I used a higher ohm coil on my 30 watt mod. maybe but I'm not sure because again I'm back to 30 watts is 30 watts. I tend to think the higher ohm coil would pull less amps and be easier on your battery but because of the VW board I guess that thinking go out the window.
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For 35 years I drove manual transmission cars. They have advantages over automatics that I appreciate. Why do you say all cars have automatic transmissions in them?
They aren't. Very few cars are automatic; the great majority are manual.
Oh... you live in the USA... that explains it ;-)
Probably because you allow kids as young as 15 a driving license. Whereas in the UK, we make them wait until they're 18 to take the test.
Which is the whole point and the analogy of course. In the USA more people have to have cars so driving has to be easier. Frankly, VV is not in practise noticeably harder to use than VW. You might have to be aware that the difference between 5.0 and 5.1V is bigger than the difference between 3.0 and 3.1V, but maybe not even that.
(At 5V a 0.1V difference is 1W per ohm, at 3V it's only 0.6W. But that 1W is 1/25th of the power at 5V, and that 0.6W is 1/15th of the power at 3V. So although the power is increasing faster, the perceived increase is actually slower.)
And when you are adjusting a vape, the voltage or the power is just a number you are changing. Nobody converts one to the other, or even takes much note of the absolute value, until they want to
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