Ohm, voltage and stickies

[Trips1103]

Hi. I checked the library but couldn't find any stickies or references to the following things:

-Explaining Ohms

-3.7 vs. 5 volt and what does it mean (basic voltage questions)

-Dual coil, single coil, bottom coil -- what is the difference?

-Other useful information that helps a person understand how ecigs work.


...

Basically stuff that I wanted to brush up on so I can try to explain it to my husband more easily. It's not really a beginner discussion (unless you're already familiar with electronics) .. more so an intermediate, "things I need to know before buying a mod" discussion.


I know there are probably a ton of threads containing this info .. but is there any set reference tool, or guide that ECF has regarding these topics?


Thanks.

 

[tj99959]

Ya I know, someone needs to stop having a life and update the darn things.

 

[fray]

Hi. I checked the library but couldn't find any stickies or references to the following things:

-Explaining Ohms

-3.7 vs. 5 volt and what does it mean (basic voltage questions)

-Dual coil, single coil, bottom coil -- what is the difference?

-Other useful information that helps a person understand how ecigs work.


...

Basically stuff that I wanted to brush up on so I can try to explain it to my husband more easily. It's not really a beginner discussion (unless you're already familiar with electronics) .. more so an intermediate, "things I need to know before buying a mod" discussion.


I know there are probably a ton of threads containing this info .. but is there any set reference tool, or guide that ECF has regarding these topics?


Thanks.

An ohm is a measurement of electric resistance in the circuit. The higher the ohms the slower the cool heats up it also pulls less current (amps) from the battery. The lower the ohms the faster the coil heats up. It pulls more amps. A dead short will be little to no resistance and pulls high current. This can all be calculated using ohms law.

Changing the resistance of atomizers allows you to get to a wattage that you like. (see ohms law)

The same thing can be done by changing the voltage. The higher the voltage, the more current you get. (heats up coil faster). So a 2 ohm carto on 3.7 is a nice vape while that same carto at 5v is very hot and burns juice.

Single coil cartos contain 1 atomizer coil. These include the vertical placed coils like boge cartos and horizontal coil cartos have the coil placed at the bottom placed horizontally.

Dual coil cartos have 2 coils wired in parallel. A 1.5 ohm dual coil carto has 2 3 ohm atomizer coils.

I would post sources if I wasn't on my phone.

 

[Jeremy-WI]

If you want to figure watts, its (voltage x voltage) / ohms So if you are using 6 volts into a 3 ohm load, you are using 12 watts, and since volts x amps = watts, you are using 2 amps. The wires are pretty small on the cartos so you cannot keep upping the amps to them before they pop and lower maH batteries can be damaged if you draw too many amps from them. Higher watts means more heat, but you can only use so much heat before you get a burnt taste with cartos and atty/cartridge/tank combos

 

[AttyPops]

FYI - if you haven't seen it already - there's some stuff in the "info pages" link in the upper-left of the menu on the top of the screen that may help.

ECF Forum

 

[Trips1103]

Ok so it would be fair to say that the higher the voltage the battery is, the higher resistance you need on your atomizer/cartomizer to offset it?

How can you tell what a good mid point is? Right now I'm using a 3.7 eGo, and it's old, so I'm guessing it barely gets 3.4. I'm also using a 2.0 dual coil cartomizer with a tank. This seems to work pretty well. What would happen if I purchased a unit that actually does get 3.7? ... OR if I went with a bit lower resistance carto? Would I see a tremendous difference, or would it be something that's more akin to personal taste?

I should really get a vv mod. I'd probably "get" all of this a lot better.

 

[Trips1103]

FYI - if you haven't seen it already - there's some stuff in the "info pages" link in the upper-left of the menu on the top of the screen that may help.

ECF Forum

Noted! I have the forum linked, so I bypass that page most of the time. Looks like there is good information there. I'll check it out.

 

[erich]

Here's a handy little tool:
Ohm's law calculator

plug in any 2 values, and it'll fill in the other 2. In general, the same wattage (power) rating will be an equivalent amount of vapor.

 

[KeithB]

+1 on the Ohm's law calculator.

Wattage is a major factor in a good vape. It's been said most people's sweet spot is between 6 and 8 watts. I vape around 10 to 12 watts. You can increase your wattage by increasing the voltage you vape at, decreasing the resistance (ohms) of your carto/atty or both. 5V with a 2 ohm Boge carto will give you 12.5 watts and is very nice in my opinion.

For example, my first PV, the nJoy nPro was a 3.2V battery with a 3 ohm carto giving about 3.4 watts; not very satisfying for me. An eGo at 3.4V with a 2 ohm carto will give you `5.78 watts; fairly decent and just fine for some. Some people will go even lower resistance to get more wattage, but I personally wouldn't go below 2 ohms on an eGo for fear of overheating the electronics within. If you go up to 5V then 3 ohms will give you 8.3 watts, 2.5 ohms will give you 10 watts and 2 ohms will give you 12.5 watts.

More watts gives you more vapor, warmer vapor and probably more TH. Just by looking at the above paragraph may indicate why the VV (variable voltage) devices are popular with some. They let you dial in just the right vape with whatever atty or carto you're using at the time.

 

[Iffy]

Wattage is a major factor in a good vape.

Actually, I say it's THE major factor. Once folk figure out their wattage/flav sweet spot, they can $ave $oooooo much money!

 

[mynameisrob]

The eGo is actually 3.2-3.4V regulated, not 3.7V. If you went with a 3.7V it will give a slightly warmer vape and more TH. They also can handle LR attys/cartos better.
For an eGo, like keithB said, I would NOT go below 2.0ohm. Anything lower puts alot of stress on the eGo mosfet and you risk frying the mosfet and turning your eGo into a paperweight. If you like LRs like the 1.5ohm or 1.7ohm cartos, then I would get a different PV that can handle them better. For something comparable in price to the eGo, the E-Power, kGo, and Riva are all 3.7V and work great. I have an E-Power and use 1.7ohm Ressurectors and they work really well. They def give alittle more oomph than an eGo. Also the E-Power uses non-proprietary batteries and everything is replacable on it so its alot cheaper to maintain.
The kGo is also a really solid 3.7V that works great with LRs. They actually come off the charger at around 4.2 and then drop to around 3.7V. The 3.7V PVs also handle dual coils better than an eGo, E-Power ever has a 1.5ohm DC that is designed specifically for it and holds alittle over 5ml of juice. Both have batteries that last long and most users get at least a full day per battery depending on how much they vape and what they use on it.(DCs will drain batteries much faster) So something like that would be a good way to get something that will handle the LRs better without spending a ton of money. And if you can afford it, like you said before, a VV PV is really nice bc you can dial it in to whatever your using.

 

[Trips1103]

Excellent! This is perfect. Not to mention that the thread reads easier posts to more complex ... so understanding (and being able to relate it to someone else now) is much easier.

I'm putting this thread in my favorites for reference. I really like that calculator!

Thanks!