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Ohm's Law - a Quick Guide


Ohm’s Law is a part of vaping that tends to be over looked quite frequently when starting your vaping journey, however it is information that is integral to implementing safe vaping practice. We understand that Ohm’s law as a mathematical calculation can be quite confusing to understand and how it can be applied to vaping. By the end of this blog we hope you will be able to go on and vape happily and safely as well as learning something new!

What is Ohm’s Law

So Ohm’s Law is very simple to remember if you can remember the below image:

Remember this image and you’re set to go, put a copy in your wallet/purse, stick on your fridge or simply save it in the memory bank.

The Calculation

From here, you can find out any of the values as long as you have the remaining two, demonstrated by the image below:

So in short, as an example, if you want to find out the amps (represented by the “I”) then simply cover it with you finger and carry out the calculation required on the remaining values, in this case that would be Voltage (V) multiplied by Resistance (R).

How is This Applicable to Vaping?

Knowing the above is all well and good, but how does it apply to vaping? Well, in short each battery and power output has a resistance range that it is safely capable of powering. You wouldn’t want your battery to struggle to heat your coil, nor would you want too much power running through a coil that can’t handle it.

So, arguably, the big one you have to remember is whether your battery has enough power to safely heat your coils. To work this out we need to know the current (amps), which is represented by “I”, all we need to do is cover the “I” with our finger, leaving V / R or Voltage divided by Resistance. You can find these out by using a dedicated meter or by screwing the Atomiser onto your Regulated device, but be careful, you don’t want to fire the device yet.

Once you have picked your desired Voltage (variable wattage will adjust your voltage based on the resistance of your coil) then divide the Voltage by the resistance of your coil and you will have the current (amps) running through the coil. You want your battery to have a high enough amp limit to accommodate this, we suggest that your battery has a capacity that is at least 5 amps higher than what is required for your coil build.

Below is a the calculation used if you know the wattage but do not know the voltage.

For a more in depth look into Ohm’s law and how it is calculated, here is a free calculator and explanation.

Got a series box? The man known as Twisted Messes has done a brilliant video with an in depth explanation of building for series boxes.

We realise that all this information is a lot to take in, so why not contact us on our Facebook page and we will be more than happy to answer any questions you may have.


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