Beginners Ohm's law & coil build DIY: Qs

[rice721]

I'm posting this b/c I have a couple of intermediate questions regarding coil building...I'm only into regulated mods.

Ok, so google is my best friend...but I still have a couple questions (see below).

ohms law, no matter how you swap the variables around the basics are

V = I X R

where...
V = voltage of battery
I = amperes
R = resistance

First part Q:

So R is self explanatory, resistance of the coils you're building. More details and specific questions on this later, as there are 3 variables(?) to the target resistance you want to achieve, namely, wire gauge, inner diameter (diameter of your wrap), and finally how many wraps (aka total length of wire, including how many coils you're building).

So I, i am assuming this is the A when you're looking at batteries? So for example if you're using a single 18650 LG HG2, the A is 20?

V, voltage of battery, from what I've found, 4.2V is the norm for a fully charged 18650 battery(?)

Assuming the above is correct, with a LG HG2, if you're building a 1ohm resistance coil, the ampere required for this is: I = V/R, I = 4.2 / 1, I = 4.2A?

Assuming the above calculation is correct, what does this 4.2A translate to mah? How many hours of continuous vape time can I achieve with a 3000mah LG HG2 say if you're vaping at 15W, 20W?


Second part Q:

This part pertains to building the resistance you want. Please correct me where I am wrong.

So when it comes to building you're own coils, my assumption is that there are a total of 3 variables (assuming a normal kanthal A1 build).

1. total wire length, whether it be single, dual, triple, quad, etc
2. wire diameter, higher the gauge smaller the diameter and vice versa
3. inner diameter of your wrap, the larger the diameter of your wrap, the more coil material, the larger the resistance.

So for example, if you're target resistance is 1ohm, you will need more wraps OR a larger wrap diameter with a 28 gauge than you will with a 26 gauage?

AND

You will need lesser wrap in a dual coil than you would with a single coil?

AND

the more wraps, the larger the wrap diameter, the more surface area, the better the taste of your vape?


Anyway, I just ordered a whole bunch of stuff for DIY, several RTAs, 5 different gauge kanthal A1 wires, coil master DIY kit, Koh gen doh cotton.

Wanted a thorough understanding of coil builds before I start (vape mail yet to arrive, tuesday ETA).

TIA for any comments, answers, and suggestions.

 

[EBates]

Coil wrapping
This is what I use for coil building. It will give you your coil design based on what you are going for.
The Coil Wrapping and Battery Drain tabs should help you with your build.

 

[IMFire3605]

... I'm only into regulated mods....

Regulated Mod you need to learn "Watts Law"
Amps=Watts/Lowest Charge Per Battery

60watt single battery mod using 3.0v lowest charge state
60watts/3.0volts=20amps
The resistance factor is there, but it is very much relegated to the mod chipset to do its calculations, you only have to worry about the lowest resistance the mod will fire with, examples in the mod spec sheets, lowest 0.2ohm highest 3.0ohms, as long as the coil is in the example ranges, Mod XXXX will read and fire that coil up to its max current draw of its batteries or max voltage it is capable of in the case of a 3.0ohm coil a 60watt mod will never reach full 60watts. Its just a matter of learning what the lowest battery state is per model of mod to get your formula right, range is between 3.0 to 3.55v per battery cell depending on the mod. Some will say learn the mod efficiency and divide final amps by the efficiency, example 90% efficiency, 20amps/0.9=final amps, but I look at safety and simplicity, just figure straight Watts Law, then you have that extra 10% or so lost at the circuits as a safety margin because I am not cloud comping or cloud tricking to geek every ounce of efficiency out of a vape, just KISS it (keep it simple stupid)

 

[Paul lamb]

Would be a great thread to keep updated due to that bloody noisey cricket out break

 

[Ronald3638]

FYI
The "I" stands for electrical Intensity measured in amps and instead of "V" it's usually represented by the letter "E" which stands for Electromotive Force measured in volts.