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The Vape Mall Blog

The Vape Mall Refresher: Ohm’s Law

Posted by David on

Ohm's Law is one of the biggest things that vapers need to know, whether your sub-ohming or just doing some normal vape sessions. Not only will you be able to have a better vaping experience, but you will also know how to make sure your devices are exactly how you want them to be without damaging them. You will also be able to stay safe since you will know exactly what your device can handle. Once we talk about Ohm's Law, hopefully you will have a better understanding. 


Ohm's Law refers to the basic relationships that are found in electrical currents. For a given resistance, current is fixed to voltage. What that means is when you increase the voltage in a device where the resistance is fixed or constant, then the current goes up and if you decrease the voltage then the current goes down.

With this law, there’s a certain way to calculate it.

The formula for that is: V=IxR or I=V/R

“V” stands for voltage in volts.

“I” stands for current in amperes

“R” stands for resistance in ohms.

With vaping, you can use this formula to make sure your coil builds are within the safe limits that your battery can handle. The way you would calculate would be like this. Say your charged battery has 3.7V and your coil is 0.5Ω. Since you have these, you can now calculate the amps. Your calculation would look like this: I=3.7V/0.5Ω. This would mean that I=7.4A. This means that, if your fully charged battery is 3.7V and your coil is 0.5Ω, if your battery limit is above 7.4A then you’re good. One thing to point out is that when your battery starts losing charge, your numbers will go down. Remember, if you have 2 of the 3 variables, you will be able to use the calculation and get your answer.

Since we know how to calculate it, we need to discuss why it is important to know what it is and how to use it. The biggest reason is so you can add on the right equipment. You don't want to just go adding on equipment without knowing what your battery can handle. This can lead to all kinds of other issues.

One of the biggest reasons for this is, if you get equipment that your battery can't handle, there’s a chance that your unit can be seriously damaged.

Another thing that could happen is that your device can do something called “venting”. When this happens, harmful chemicals can be released from the unit. If the device happens to not get damaged up or vent, it could mess up your battery which could end up messing up your entire device in the end.

As you can see, knowing Ohm's Law isn't something that should be taken lightly. In fact, it's really something that needs to be known. Calculation and execution will not only help you build better builds and better your vape sessions, but it will also help you stay safe.

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