Ohm’s and Watt’s Laws

E-Cig Vaping Basics: Ohm's and Watt's Laws Explained

Ohms…? Are We Going To Meditate?

If this is all new to you it may seem like a lot to learn. What is Ohm’s law? What is an Ohm? You are probably familiar with Watts based on common household devices like light-bulbs, but what is Watt’s law and how does it apply to vaping? Why are these things important?

These are the questions I want to cover in this section and I recommend that every vaper familiarize themselves with these basic electrical principals as it will not only make your vaping experience safer but much more satisfying as well.

So, let’s jump right in, shall we?

Ohm’s law, which is commonly known as the Ohm’s law equation deals with the relationship between voltage (Volts), current (Amps) and resistance (Ohms). Watt’s law adds a fourth component and deals with the relationships between power (Watts) to current (Amps), voltage (Volts) and resistance (Ohms).

Again this seems complicated at first but it’s pretty simple if you are mathematically minded at all because they are both essentially algebraic equations. When you combine them, as long as you know any two of the four aspects (Volts, Amps, Ohms, Watts), you can easily solve for the other two. I personally use a free Ohm/Watt calculator online but for those interested in the base math itself, they do also show all the possible equations there as well.

To use the online calculator, all you need to do is enter two of the values (W/V/A/O) into the appropriate fields and it will calculate the other two for you. It doesn’t get much easier than that especially if math isn’t your thing!

-So why is this important?

Good question! There are a few reasons really, not the least of which ties right into battery safety.

Before we get into battery safety though, let’s take a trip back in time to the days old ego twist variable voltage e-cigs. More for my own curiosity than anything else, I wanted to find out what wattage I was vaping at when I was at my preferred voltage at the time which was about 4.2 when I switched to my first variable wattage device. At the time I was using an Aspire Nautilus tank with a coil resistance of 1.6 Ohms.

Using the online calculator, if you plug in the numbers, 4.2 Volts and 1.6 Ohms, press Calculate and you will see, I was vaping at just a shade over 11 Watts at 2.625 Amps of current.

-That’s great but other that curiosity what benefit does it serve knowing what wattage or amps I am using?

Although I do find it helpful knowing the wattage I am using just to get the best flavor out of my e-liquid, it is of the utmost importance to know the current you’ll need available in the batteries you buy if you are buying separate batteries for you mod.

Not all electronics batteries were created equal and not all batteries were designed to be “high drain” which is required for vaping and particularly for any sub-ohm vaping.

To make certain your batteries don’t blow up on you, you’ll need to find out what current your set-up in going to require, or the Amps needed in your battery.

Now that we have the basics covered on Ohm’s and Watt’s laws and we now know how to get values for volts watts amps and ohms, let’s delve further into how this translates directly in terms of battery safety, shall we?