Math to calculate ohms, amps when setting up my build

[Captain Murphy]

Basics

I am using:
Nemisis Clone
Kraken Clone
I have a 18650 battery at 3.7 volts
Suicide Bunny - Mothers Milk 0% nic, mixed with a Tangerine 18%nic
it has a double 6 coil (sire size unknown) with cotton.

So now we can get to the question.

What is the math that is used to calculate ohms, amps when setting up my build?
Does the wire size get calculated as well?
Do the amount of coils have a place in this equation of crazy?
When Braided coils are used how does this effect the equation?

Thanks for any help.

 

[Fisheeboy]

Yes, yes she is!
That's all I can say.

 

[Susan~S]

Yes, yes she is!
That's all I can say.

No she's not! She's your best friend, but she's a strict task master! So, Captain Murphy, have you done any reading, any homework?

 

[State O' Flux]

What is the math that is used to calculate ohms, amps when setting up my build?
Does the wire size get calculated as well?
Do the amount of coils have a place in this equation of crazy?
When Braided coils are used how does this effect the equation?

Thanks for any help.

Welcome to ECF Murphy...

Click on my second sig line hyperlink - read the article, and all articles linked within. Repeat until you understand.

 

[novamatt]

Basics

I am using:
Nemisis Clone
Kraken Clone
I have a 18650 battery at 3.7 volts
Suicide Bunny - Mothers Milk 0% nic, mixed with a Tangerine 18%nic
it has a double 6 coil (sire size unknown) with cotton.

So now we can get to the question.

What is the math that is used to calculate ohms, amps when setting up my build?
Does the wire size get calculated as well?
Do the amount of coils have a place in this equation of crazy?
When Braided coils are used how does this effect the equation?

Thanks for any help.

You need to get a multimeter or an ohm reader. Running a coil you haven't tested on a mech mod like a Nemesis is dangerous. Do you know what brand and model your 18650 battery is? You need that information as well.

For your other questions, the formulas are all based around Ohm's law:

1) Wattage is calculated by squaring your voltage (which is actually 4.2v when fully charged - this is the number you want to use) and dividing the result by your resistance in ohms.

2) Amperage is calculated by dividing your voltage (again, 4.2v) by your resistance in ohms.

For example, with a 1.8 ohm coil, you're running at 9.8 watts (4.2 x 4.2 = 17.64, 17.64/1.8 = 9.8), and drawing 2.333 amps of current (4.2/1.8 = 2.333).

To run this equipment safely, you should be very familiar with these equations and be able to do them in your sleep. You also need to know what's safe to do with your battery (which would be no more than 75% of the battery's maximum continuous discharge rating, IF you have the right TYPE of 18650 battery. Running a mech mod on the wrong type of battery is not safe PERIOD).

Wire size - the higher number the wire's guage is, the thinner your wire is, and the higher your resistance. So 28 gauge is thicker than 30 gauge, and the resistance for the same coil will be lower on the 28 than on the 30.

Coils - the more wraps (i.e. the longer your wire is), the higher your coil's resistance is.

Braided coils will reduce your resistance significantly. Dual coils will reduce the total resistance of the circuit to half of what each individual coils is, triples a third, and so on.

To be honest with you, I'm a little hesitant to be answering these questions, because you are most certainly not being safe. Playing with this stuff without knowing these equations and testing your coils can wind up getting you seriously hurt. If you don't understand this stuff inside and out, you should not be using a mechanical mod. Any mod with variable power (VV/VW) will be safe whether you understand the circuit or not. But the ONLY safety feature in a mech mod is the knowledge of the person using it. If you don't have that knowledge, you don't have any protection.

 

[mujuru]

In a nutshell, just google, ohms law calculator, and have that do the math for you...

And yes... all of your questions matter. Wire size, number of wraps as well as braided (twisted) coils.

Wire size: Thicker gauge = lower ohms.. all other things being equal
number of wraps: less wraps = lower ohms... all other things being equal.
Braided coils: whether twisted, braided or run parallel... you're essentially running more coils based on the number of "strands" of kantahl actually running from negative to positive post. More strands = less ohms.... all other things being equal.

Sounds like someone else built your set up and you aren't sure of any of the parameters, etc... First off, based on your pretty vague description, you're probably at least creeping up on sub-ohm territory... and most likely well within it. Personally, I wouldn't trust someone else to build there for me... and I wouldn't build it for someone else, unless they have a full understanding of what the build is doing, etc... No offense, but what happens when a person that doesn't understand or know what kind of amps the set up is pulling and runs out of power, stops by the nearest shop and picks up a battery with amp limits below what is needed? I know when i first started, I had no idea about amps... didn't need it... i just plugged things together and vaped... of course, i was using a provari back then. an 18650 was a 18650.. The point being: its good you're asking questions... but i think whoever built your rig and didn't bother to go over the details with you, is doing you a strong disservice. But i digress...

If you're going to build... or vape for that matter... its a good idea to get a multimeter so you can figure out your Ohms... from there you can calculate amp requirements... but all of the variable you asked about effect the overall Ohms as noted above.

Vape safe man!

 

[classwife]

Thread title edited...Not appropriate for ECF.

 

[mujuru]

Wire size - the lower number the wire's guage is, the thinner your wire is, and the higher your resistance.

Hey Novamatt... i think you flipped this on accident... the lower number gauge is actually THICKER and therefore less resistant...

 

[JDCJDC]

Maybe a regulated VV/VW device with a built in ohm meter might work for you as well. Just thinking out loud is all !!!

 

[novamatt]

Hey Novamatt... i think you flipped this on accident... the lower number gauge is actually THICKER and therefore less resistant...

You're right, I did. I was too worried about the safety stuff and just typed it backwards. Fixed it. Thanks!

 

[finagle69]

Bookmark this site. Lots of good calculators there.

Ohm's law | Steam Engine | free vaping calculators

 

[Fisheeboy]

No she's not! She's your best friend, but she's a strict task master! So, Captain Murphy, have you done any reading, any homework?

Okay, you're right, she's not. But she still makes my head hurt. I have serious dyslexia and math really screws with my head. I've been going over ohm's law for months now and for some reason it's just barely starting to make sense. My severe dyslexia is not an excuse just a pain in the ..... Safety above all else.
Good job fellow ECF member's. I'm proud to be a member of this fine forum

 

[Susan~S]

Okay, you're right, she's not. But she still makes my head hurt. I have serious dyslexia and math really screws with my head. I've been going over ohm's law for months now and for some reason it's just barely starting to make sense. My severe dyslexia is not an excuse just a pain in the ..... Safety above all else.
Good job fellow ECF member's. I'm proud to be a member of this fine forum

Just ribbing you! Dyslexia is a tough one. My niece (also with dyslexia) was lucky in that my sister got her some great help early on and was willing to work with her daily (all through K12). It was a tough road they followed. But because of all this my niece will be graduating from college in a year as a Special Ed teacher. Perseverance pays off in the end!

 

[tayone415]

Easiest and safest way to vape and sub ohm:

Get a voltage reader and an ohm reader and know both readings, or a combination reader, I have one that does both. (always carry it with you when using your mod on the go and check your battery more often than not)

Get an ohms law calculator (free download with android devices, can google it and find and use for free)
Enter in your ohms or resistance for your RDA or RBA in the correct box and do the same for your current battery voltage. You will see your current amps that will be used for your build.

Get a good charger that won't overcharge or undercharge your battery (Voltage reader again comes into play)

DON'T go cheap with batteries and KNOW your batteries limit and KNOW your batteries CONTINUOUS power NOT pulsing power.

Sony's VTC5 18650 battery with 4.2V and a continuous 30 amp draw is a good safety battery. (Just DON'T run the battery too low) Also gives better vape quality I have 4 of them.

Then as long as you don't draw beyond 30 amps you're on the safer side, also you want a cushion for safety so don't run 30 amps or 29 amps. You can run .15 ohms and draw in 28 amps on a Sony, but it will be hot, and the lower your ohms and the more coils the more battery used and will deplete much quicker. (Very IMPORTANTLY the voltage reader comes in to play again)

 

[novamatt]

Easiest and safest way to vape and sub ohm:

Get a voltage reader and an ohm reader and know both readings, or a combination reader, I have one that does both. (always carry it with you when using your mod on the go and check your battery more often than not)

Get an ohms law calculator (free download with android devices, can google it and find and use for free)
Enter in your ohms or resistance for your RDA or RBA in the correct box and do the same for your current battery voltage. You will see your current amps that will be used for your build.

Get a good charger that won't overcharge or undercharge your battery (Voltage reader again comes into play)

DON'T go cheap with batteries and KNOW your batteries limit and KNOW your batteries CONTINUOUS power NOT pulsing power.

Sony's VTC5 18650 battery with 4.2V and a continuous 30 amp draw is a good safety battery. (Just DON'T run the battery too low) Also gives better vape quality I have 4 of them.

Then as long as you don't draw beyond 30 amps you're on the safer side, also you want a cushion for safety so don't run 30 amps or 29 amps. You can run .15 ohms and draw in 28 amps on a Sony, but it will be hot, and the lower your ohms and the more coils the more battery used and will deplete much quicker. (Very IMPORTANTLY the voltage reader comes in to play again)

Most of this is dead on. The one quibble I have is that it's pretty much universally recommended by the experts that you don't want to go over 75-80% of your battery's max continuous draw - for a beginner, I'd DEFINITELY say the lower end of that. 75% of the VTC5's 30 amp max would be 22.5 amps. You don't want to go over that (which would be under .2 ohms. You don't want to go that low anyway, because pretty much any testing equipment you have is going to have a margin for error. .2 ohms is practically a short.).

 

[GeorgeWachsmuth]

Lots of good advice. Also...if you have a smartphone there is a free, very user friendly app that will be very helpful. You can input wire type, gauge, resistance desired, diameter of coil...etc and it calculates everything for you...amount of wire..wraps needed etc. . You can also put in resistance and voltage and get the watts and amps...or resistance and wattage and get the voltage and amperage. Its called Vapers Toolbox.

 

[realsis]

Thanks for above post! Great app I love it!!

 

[perryplatypus]

Lots of good advice. Also...if you have a smartphone there is a free, very user friendly app that will be very helpful. You can input wire type, gauge, resistance desired, diameter of coil...etc and it calculates everything for you...amount of wire..wraps needed etc. . You can also put in resistane an voltage and get thecwatts and amps...or resistance and wattage and get the voltage and amperage. Its called Vapers Toolbox.

I started building my own coils about 3-4 weeks ago. The Vapers Toolbox is invaluable.

 

[tayone415]

Most of this is dead one. The one quibble I have is that it's pretty much universally recommended by the experts that you don't want to go over 75-80% of your battery's max continuous draw - for a beginner, I'd DEFINITELY say the lower end of that. 75% of the VTC5's 30 amp max would be 22.5 amps. You don't want to go over that (which would be under .2 ohms. You don't want to go that low anyway, because pretty much any testing equipment you have is going to have a margin for error. .2 ohms is practically a short.).

I probably should of mentioned the chance of error, I actually check my ohms after a build a few times and my battery to get a better idea of accuracy or inaccuracy of what it is reading, but novamatt has a good point, the reading maybe off. When you start off you don't want to build too low, I was NOT recommending to build a 0.2 ohm coil or lower.

Besides the point and I'm NOT recommending and NOT suggesting this build to anyone, 0.2 ohms at 4.2V is drawing 21 amps which is 70% of the continuous 30 amps and .18 ohms at 4.2V is 23.333333333333V which is 77.7777777% of the continuous 30 amps for a Sony VTC5 or VTC4 and I don't go lower than .18 ohms, plus at those ohms 4.2V doesn't last long.

Also, something to account for is with a freshly charged battery even while using a smart charger that will stop your battery when "fully" charged is only accurate to +/_ 0.05 v which will temporarily draw more amps until it depletes when charged over 4.2 V.

Just realized you were using an RBA and an RDA on an RBA you don't want to build too low since and RBA still has needs time to wick depending on your tank and juice you probably wouldn't want to go any lower than a 0.3 ohms (depending on the tank) since even that low might not wick fast enough. You should do a search and see what the best ohm build is for your RBA.

 

[Captain Murphy]

So, its been awhile since i was able to get to actually build my coils, and i thank everyone for their warnings and cautions, i really do. I had done some research prior to throwing myself to the wolves and there where still some questions that were answered here so thanks. i did my own build finally, its a little loose but it still works great. I did however go to one of the local vape shops in the area and get a tech to look at it to make sure i did not go KABOOM, and it looks like i am sub-ohming, good flavor good clouds. now with everyones help and advice its time to start pushing for amazing clouds and amazing flavor. thanks again for all the help.