If you're comfortable with your understanding of vape battery security , the next consideration is using some kind of calculator to be certain that your coil builds are inside that safe limits of your battery, and further, to enable you to tweak your amps to find the vaping experience you would like. There are loads of Ohm's Law calculators, and websites like Steam Engine that is going to do the heavy lifting for you.
If you're delighted with those, and want to remain blissfully ignorant about what's behind the calculations, good for you. Provided that you learn how to apply the outcome, you'll live a long, happy, and secure vaping life. But if you want see the internal workings of these calculators, read on.
There is nothing mysterious or magical about Ohm's Law. It's a couple of formulas, usually depicted inside of a triangle, and anybody can easily learn and use the formulas together with any normal calculator.
The purpose here is to show you the formulas behind Ohm's Law and hopefully provide you with an understanding of the connections between different elements in a standard digital circuit as related to vaping.
Within the triangle you can see the three chief components in any electrical circuit, represented by the letters V, I, and R. I'd vocalize the triangle as"V over I occasions R" with"times" being multiplication. The toughest part of this is recalling what the letters represent, and that is easy:
V = Voltage (your battery voltage)
I = Present (the amperage drawn by your coil)
R = Resistance (the resistance, in ohms, of your coil)
So, how can we use the Ohm's Law triangle? Again, easy -- the triangle visually depicts the relationship between voltage, current, and resistance. In the following examples we will explore how to use the triangle and formulas that will assist you build coils targeting the current and wattage you would like.
If You Wish to determine the current draw through a resistance (your coil) the formula is:
I = V ÷ R (or I = V/R)
How did we arrive at that? Take a look at the triangle and you'll see that to solve for current (I)you have to divide voltage (V) by immunity (R).
Let's set the formula to work in a real life example. If you're using a mechanical mod, with a freshly charged battery you theoretically have 4.2 V readily available to power your coil. If your coil is 0.5Ω, you finally have everything you need to determine current, in amps:
I = 4.2 V ÷ 0.5Ω (or 4.2/0.5)
I = 8.4 A
As you can see, with your 0.5-ohm coil and a newly charged battery in 4.2 volts, the resulting maximum current draw will be 8.4 amps. If your battery has a 10-amp limit, you're well under the cap. Do not forget that using a double mechanical mod in string configuration will double your amp draw battery, and you'll need to create coils with twice as substantial resistance to be secure. Also notice that as the battery depletes, the present will even tail off. For example, when the battery reaches 3.7 volts with the same load, current will fall to 7.4 amps (3.7 liter / 0.5 ohms)
The next thing you will most likely need to know is the energy generated in the coil, or wattage. It is not revealed in the triangle, but the formula is straightforward. Just multiply the present on your circuit from the voltage applied:
P = V x I
In our first example, the formula would look like this:
P = 4.2 V x 8.4 A
P = 35.3 W
So that 0.5-ohm coil using a fully charged battery at 4.2 volts will pull a maximum of 8.4 amps and deliver 35.3 watts. You can see that as the resistance of your coil increases, current will fall and wattage will fall.
The next Ohm's Law formula which could be of use to us is calculating immunity. Let's say you have a battery with a 10-amp present limit and you would like to ascertain the lowest coil resistance which you can safely operate without surpassing the CDR of the battery.
To calculate, you'd use the following formula:
R = V ÷ I
As you know that the battery CDR is 10 amps, then you may want to target 9 amps on your calculation, to give yourself 1 amp headroom. You also know that your maximum voltage will be 4.2 volts on a single battery mod. Hence the calculation goes like this:
R = 4.2 V ÷ 9 A
R = 0.47Ω
The result tells you that your secure lower limit with the 10-amp battery is 0.47 ohms -- anything lower and you risk exceeding the current limit of the battery. Naturally, if you have a 25-amp battery, your low resistance drops to 0.17 ohms:
R = 4.2 V ÷ 25 A
R = 0.17Ω
Calculating voltage
Finally, and probably much less useful to us, using the triangle it is possible to solve for voltage in a circuit, so long as you understand the worth of the other two factors.
To fix voltage when current and resistance is known, the formula looks like this:
V = I x R
What can it all mean?
Truly, the most useful formulas for vapers, are the three which calculate present (I = V ÷ R) power (P = V x I) and resistance (R = V ÷ I). These will let you work out the present your coil will draw and the wattage that will result. As you increase resistance, power and current will fall off. If you reduce resistance, current and power increases. The resistance formula permits you to calculate a secure low resistance depending on the CDR of your battery.
It's all great information that will help you keep within the safe limits of your batteries, and also to tweak the quantity of power at your coil that will assist you realize your personal vaping nirvana. There are other factors like coil ramp time and the warmth of your coil which are determined by cable gauge and mass. Ohm's Law will not figure any of that, and also a website like Steam Engine can be useful.
1 final, and crucial piece of advice: ALWAYS assume that your battery voltage would be the equivalent of a fully charged battery: 4.2 volts for one battery mod or parallel battery mod, or 8.4 volts for a double series mod. People might argue that the coil won't ever see that true battery voltage because of voltage drop within the mod, but to be safe ALWAYS use the complete theoretical battery voltage (at full charge) on your calculations.