looking for ohm explanation

[Makidigital]

I went to buy some Ce5 clearos the other night and they were offered in 3 ohm variations. 1.8, 2.4, and 2.8 ohms. I wasn't sure which I needed. I use a 650 mah ego and I also use a lavatube (vari-volt). Can someone explain the differences in each of the ohms and why one is better than the other? Thanks in advance.

 

[The Ocelot]

Hi - this will save me a lot of typing Undestanding resistances, LR and HV

 

[Makidigital]

Hi - this will save me a lot of typing Undestanding resistances, LR and HV

Thank you for the link. It was a bit tough for me to understand though. When it comes to volts, watts, ohms, etc. I am clueless. But what I gathered is that the 1.8 ohm clearos are for standard egos while the 2.4 and 2.8 ohms clearos are for vari-volt models. Is this correct? Also, between the 2.4 and 2.8 ohm clearos, the 2.4 would last longer while the 2.8 would be stronger and give more vapor but would "burn out" quicker. Is this correct? Or am I totally off?

 

[obsidianchao]

You've basically got the gist of it. I'd say go with 2.4. I find it works best with VV. 2.8 is more for mechanical mods that can handle massive wattage.

@Ocelot - DO YOU EVER SLEEP, GIRL?

 

[Baditude]

You're totally off!

Lower ohm number means less electrical resistance to the electrons supplying the energy so more heat is produced for the given voltage. So, more energy = more heat = warmer vapor.

Higher ohm number means more electrical resistance to the electrons supplying the enery so less heat is produced for the given voltage. So, less energy = less heat = cooler vapor.

Not completely true, but in layman's terms that is the end result. Since LR coils have more heat they tend to be less durable and burn out quicker. LR coils have a limitation to the voltage they can receive, so they are not recommended for use with variable voltage. The below Safe vaping Power Chart may be more helpful to understand why a particular ohm is better suited to a particular voltage range:

http://www.ecigadvanced.com/community/wp-content/uploads/2012/07/power.jpg

 

[Sicarius]

3.7v at 1.8Ohm = 7.6W (good vapour production, warm)
3.7v at 2.4Ohm = 5.7W (less vapour production, cool)
3.7V at 2.8Ohm = 4.9W (not really worth bothering, too cool)

The higher the resistance the less wattage output.

Watts = heat = vapor = happy me

 

[Makidigital]

3.7v at 1.8Ohm = 7.6W (good vapour production, warm)
3.7v at 2.4Ohm = 5.7W (less vapour production, cool)
3.7V at 2.8Ohm = 4.9W (not really worth bothering, too cool)

The higher the resistance the less wattage output.

Watts = heat = vapor = happy me

OK Perfect! Now I understand. What about higher voltages though? Can you use a 1.8 ohm in a vari-volt? For example, at 5.0v do the same rules apply? Thank you all for the explanations btw, I'm finally understanding.

 

[Antoly]

You can use LR on VV if you never set too high voltage. For instance, for 5V wattage it will be 5*5/1.8=14 Watt, too high, I guess. But with 3.7v it is completely OK. In general, with VV you can find proper voltage for any resistance, that's exactly what VV is for.

 

[volume control]

Go with the 1.8ohm and you can use them on both your devices. Id set the voltage on your VV about 3.7 for a 1.8ohm head

 

[generic mutant]

Watts - volts - amps - ohms conversion calculator

This might help too - there are others dotted around, I like this one because it has an easy reference for the formulae.

 

[SissySpike]

Lets look at it like a garden hose. Think about one of those brass nozzles the kind you twist. Ok lets say we have 40lbs of water presser. If we just let it run straight from the hose we get a steady stream of water that drops off very quickly. With the nozzle on we get get built up pressure so if we open the nozzle just a little we get a stream of water that goes allot further.
With OHMs you are restricting the DC current. So low OHMs are kind of like putting the nozzle on just a little bit the water or DC current comes out in a more powerful stream.
The more you open the nozzle or decrease the resistance the more water you have or DC current you have flowing.
If you put to much water presser on the hose you start having trouble blowing out your hose or nozzle ect.... Same with Low Resistance. If you try to restrict the flow of electricity to much you get to many amps and you start frying switches boards and so on.
This is how I get a grasp on things there's more to it but with a working knowledge you can figure things out a little better.

 

[zoiDman]

OK Perfect! Now I understand. What about higher voltages though? Can you use a 1.8 ohm in a vari-volt? For example, at 5.0v do the same rules apply? Thank you all for the explanations btw, I'm finally understanding.

I hope they do. Because if they don't, Maxwell is going to have a Fit.

Check out this animation....

http://phet.colorado.edu/sims/ohms-law/ohms-law_en.html

Since Volts(V) in this case are Defined as Amps(I) multiplied by Ohms(R), than when the Resistance changes the Amps have to change Also. They are Locked in a Dance together.

Here in lies the Problem.

As the Ohms get Smaller, the Amps have to get Bigger to Maintain Equilibrium for a given Voltage. But there can come a point where the Amps get Big Enough to Exceed the Safe Limit of what the Battery or the PV can Output. Or Both.

So as you run Lower and Lower Ohms, you run Higher and Higher Amps. And if you do this far enough, Something Has to Give.

And for Vaper's, that might be the Battery Melting Down or in a Worse Case, Exploding. Or the PV shutting to Protect itself. Or in a Worse Case, the PV Melting Down.

 

[wv2win]

The eGo doesn't play well with low ohm cartos/attys due to it weak 2.5 amp switch. You are limited as to what you can use on all eGo type PV's. I would stick with higher ohm attachments.

 

[The Ocelot]

@Ocelot - DO YOU EVER SLEEP, GIRL?

Between about 4am to noon. Ocelots are nocturnal.

 

[The Ocelot]

I must stress that taste is the most important thing. You can use charts and calculations to get a starting point, but then you adjust up or down to find your "sweet spot." If you go strictly by math, you may not be happy. Example:

I am current vaping a carto tank. The carto is 2.1Ω, the voltage is set at 4.2v = 8.4w. That's a bit high for me, but with this juice is yummy. I have another device with a 2.6Ω head, that when filled with the same juice, started frying over 4.0v ≈ 6.2w. Why such a big difference? Why is it Tuesday?

If I was new and just using math, I might post on ECF that the juice was frying over 6w, which isn't supposed to happen. I would get all sorts of responses: clean the head; take the wick apart; lower/raise the nic/vg/pg levels; get a Vamo; get a ProVari; spin around 3x at midnight while praying to Thor - whatever. The ultimate answer? Turn the voltage down.

You don't have that option with a fixed voltage battery device, but the concept is the same.