Ohms and Voltage - if the watts are the same why does it matter?

[WillyCornbread]

HI all,

I just purchased my first variable voltage battery (ego twist 650mah), I'm using vision vivi nova's on it. I have a bunch of 1.8ohm heads, and I'm confused by the chart regarding ohms.

If I get just about the same wattage output using 3.75v on a 1.8ohm head as I would using 4.3v on a 2.2ohm head why would I choose the higher voltage and ohms? Is there some other difference in the vapor production or flavor that I'm missing?

Thanks for the assistance,

b

 

[DanKnowsJack]

Well if you know ohms law, then why ask a redundant question regarding it... That being said, if you are implying that the 1.8 ohm heads that you have are actually 1.8 ohms, then your wrong. Go ahead, bust out your ohmmeter and check. I doubt they are all 1.8... In fact I would guess they range between 1.5, and 2.2. This is why variable voltage is useful. Now if your building your own coils... no need to have VV. I guess at the end of the day, I'm wondering where you are going with this question?

ETA: Sorry if I came off a bit obtuse... I may have had a cocktail or two.

 

[Renzuli]

Welcome , and some juices tend to taste better at higher voltage/wattage . I start with the rule of two . If my atty , or carto , is 2 ohm , my starting voltage will be 4 volts . But then you can adjust up or down from there , to suit your taste . Lower voltage = cooler vape , while just the opposite for higher voltage . A lot of people now ( me included ) use a VV/VW device , such as a Evic , Vamo , or Zmax . You set the wattage to what you like to vape , and then , whatever device you put on your PV , vapes at , say 10 watts , or whatever you set it to . It will automatically adjust the voltge for you . So kinda , set it once , and forget it . But again , you will find yourself , adjusting it up or down , to suit your taste , for a particular juice . But what you have now is fine , for the time being . If you want a bit more vapor , or throat hit , turn up the voltage . Or , you can buy juices , that are heavier in the VG , as that gives more vapor , but less flavor , and throat hit . Good Luck

 

[Christopher Horsley]

theoretically watts are watts and high volts/high ohms is the same as low volts/low ohms. In practice, more factors come into play than just volts/ohms (so they say).. there's a thread going on right now in this section that should pretty well answer your question. look for the thread titled "noob's low ohms concerns"

 

[Bejeebus]

Well if you know ohms law, then why ask a redundant question regarding it... That being said, if you are implying that the 1.8 ohm heads that you have are actually 1.8 ohms, then your wrong. Go ahead, bust out your ohmmeter and check. I doubt they are all 1.8... In fact I would guess they range between 1.5, and 2.2. This is why variable voltage is useful. Now if your building your own coils... no need to have VV. I guess at the end of the day, I'm wondering where you are going with this question?

Geez, it's the NEW MEMBERS forum. No need to seem so ... I dunno, cold comes to mind. Just sayin

 

[sawalke4]

I am curious about this also. I think, If you have a 1.8ohm coil with a fixed voltage 3.7 Volt battery and the out out is 7.6Watts. If you have a 2.4ohm coil and crank it to 4.3 Volts the output is 7.7 Watts. Both very close Wattage output. But the 2.4 Ohm coil will have more surface area touching juice, so more juice will be vaporized. In the case of the 1.8 coil, the same energy is being expended, but some is being wasted either by dissipating heat into the tank or heating up the top of the battery. Just a theory.

 

[PaulP]

The only variable voltage battery I have is a Ego C-Twist and I always just set the voltage to taste...My friend has a vamo and he always says for the single coil cartomizers we vape that 8 watts is the best to set it at. But honestly I think depending on the carto that you get, you might be able to get a better hit going a little higher then that. Back to why I always set it to taste.

 

[fourthrok]

I always set it to taste.

That's it. Exactly!!!

 

[WillyCornbread]

Thanks for the replies - I will just experiment. I still can't get my head around why I would want to use more volts to generate the same watts which would produce the same vapor. One poster mention more surface area of the coils and more liquid burned - maybe thats the part I wasn't considering.

The only place I was 'going with the question' was to the online shop to order some more nova heads and wanted to know why I would want higher ohms.

I'll get a variety and see what tickles me - thanks again.

b

 

[ClippinWings]

HI all,

I just purchased my first variable voltage battery (ego twist 650mah), I'm using vision vivi nova's on it. I have a bunch of 1.8ohm heads, and I'm confused by the chart regarding ohms.

If I get just about the same wattage output using 3.75v on a 1.8ohm head as I would using 4.3v on a 2.2ohm head why would I choose the higher voltage and ohms? Is there some other difference in the vapor production or flavor that I'm missing?

Thanks for the assistance,

b

Simple answer

Because watts don't vaporize juice.. heat does...

And the way a coil produces heat is greatly effected by many factors, including it's resistance

------------------
Sent using psychic mind control powers... and Tapatalk

 

[mkbilbo]

HI all,

I just purchased my first variable voltage battery (ego twist 650mah), I'm using vision vivi nova's on it. I have a bunch of 1.8ohm heads, and I'm confused by the chart regarding ohms.

If I get just about the same wattage output using 3.75v on a 1.8ohm head as I would using 4.3v on a 2.2ohm head why would I choose the higher voltage and ohms? Is there some other difference in the vapor production or flavor that I'm missing?

Well, yeah, if you run things at the same wattage, you'll get more or less the same production. I think the bigger issue with a variable voltage is you can run a low ohm right up to, heh, "initiate self-destruct sequence".

Like my Twist here runs from 3.2 to 4.8 volts so if we're looking at the same chart ("Vaping Power Chart 2.0" is the one I have but don't remember where I nabbed it from), a 1.8 ohm widget would lose me about half my range since about half way (4v) I'd start frying juices. Higher, I could kill the widget. So going too low on the resistance would be (I'm going to type "futile" aren't I?) kind of self-defeating (narrow escape there!).

So I try to say in the 2.5 to 3.0 (more or less) area to get a wide range of settings I can use. Also, can just adjust to taste and not worry about burning something out 'cause I wasn't checking the exact voltage or something.

Not to mention, not everything labeled X ohms or Y volts is exactly that. And I'm too broke to burn out cartos and tanks with abandon.


(You know, me, I'd have to question the bit about "surface area" as the coils in question are pretty tiny and how much more surface is there to area anyway?)

 

[Christopher Horsley]

Simple answer

Because watts don't vaporize juice.. heat does...

And the way a coil produces heat is greatly effected by many factors, including it's resistance

------------------
Sent using psychic mind control powers... and Tapatalk

in the case of atomizers, heat is the direct result of watts. 20 watts WILL put out more vapor than 10 watts (in similar setups at least..), so TECHNICALLY watts DO vaporize juice

 

[mkbilbo]

in the case of atomizers, heat is the direct result of watts. 20 watts WILL put out more vapor than 10 watts (in similar setups at least..), so TECHNICALLY watts DO vaporize juice

You mean it's not the lil electrons using tiny Bic lighters????

 

[boshans]

Also take into account the battery life will change based on what ohm carto/clearo/whatever you have, and how high you set the watts/volts. i forget the equation right now, but i will look it up.

right now i am using a 1.9ohm clearo, at 7.2 watts, producing 3.69 volts...if i use a 2.5 ohm clearo, at 7.2 watts, it will use more than 3.69 volts, thereby decreasing my battery life. at least that's the way i think it should work, but i just put a higher ohm clearo on my eVic and for some reason it is saying i will get more puffs with the higher ohm clearo at higher volts than with the lower ohm clearo at lower volts...so i dunno ....

 

[ClippinWings]

in the case of atomizers, heat is the direct result of watts. 20 watts WILL put out more vapor than 10 watts (in similar setups at least..), so TECHNICALLY watts DO vaporize juice

That's not really correct... Because you won't get a 10 watt differential in similar setups.... And that goes to prove what I was saying.

A large gauge wire will have lower resistance and not get as hot at the same wattage as a thinner wire...

See your 20 watts will pop the 1/4" of 40 gauge wire you're pumping 6 volts through...

My 10 watts will heat my 2" of 30 gauge nicely.


But since the question was same watts..

17 watts

0.8 ohms
2" of 28 gauge kanthal
3.7 volts
Cool vape, big flavor, huge plumes of vapor

Or

2.1 ohms
3/4" of 36 gauge kanthal
6 volts
HOT vape, burnt flavor, low vapor

------------------
Sent using psychic mind control powers... and Tapatalk

 

[mkbilbo]

Just remember, you have to be going 88 miles per hour... no, wait, that sounds wrong...

 

[Christopher Horsley]

I think we should bring in the factor of how fast you draw the air across the atty as well. just to make SURE we've confused everyone to the best of our abilities.
But, yes ClippinWings, I get what you're saying. Wire gauge would certainly play a part in the whole equation. In certain situations it'd be like running 16g wire to a starter on a car when you should use 0g.. probably not quite that extreme, but same concept..
If you were just buying coils or atty off the shelf, however, watts is going to be the bottom line in a BASIC setup before you start going custom or high voltage.. starter kit type setups..

 

[quatro]

To answer the OP's question. One way to look at it is while keeping the heating element material constant, here a low-R low-V combo will taste very similar to a high-R high-V combo generating same power (Watts).

Vapor production/temperature will differ when you change the physical properties of the heating element. For example Kanthal and Nichrome have different values for electrical resistivity, temperature coefficient of resistance (TCR), thermo‐emf and Hall effect. When you compare 2 different setups made with different material properties then you will get different results at the same power levels (Watts). Hope that was clear as mud

 

[dzylzzrd]

I just use a variable wattage mod. I adjust it starting low going up until it's how I like it.

 

[WalkinRuin]

Yea, but can I throw a kick in my blu to burn a z atty u?

-Ray (sheesh...is this even English anymore?)