Vape School - Voltage, Resistance, Ohms

February 16, 2018

Vape School - Voltage, Resistance, Ohms

This is going to be a quick guide on what the differences of Voltage, Wattage, and Amps are. This can be very useful to know when using an E-Cigarette. It’s not as necessary when using a regulated device but when you’re using a mechanical mod with no regulatory board in it it is imperative you know and understand what each is and how it affects the battery and atomiser.


What is an Ohm? An Ohm is a unit used to measure resistance. Resistance will dictate how much electricity is let through. Higher the Ohms, the less electricity is let through. Lower the Ohms the more electricity is let through.

You’ll find with a lower resistance coil that more heat is generated and in turn more vapour and a more intense flavour is produced as well as an overall warmer vape. The downside to a lower resistance is that you’ll find the atomiser don’t last as long, batteries will drain quicker, you will use more E-liquid, and you’re more likely to get a dry hit.

On the other hand with a high resistance coil you will get the opposite. Less electricity will flow, less intense flavour, lower vapour production and a cooler vape. But you will find that your battery lasts longer, less E-liquid will be used, and you’ll be less likely to get a dry hit.


Voltage is the measurement of electrical potential difference. It is used to change how much power you want to let into the atomiser. The higher the voltage the hotter the atomiser will get, this will give the same characteristics as a low resistance coil. And a low voltage power input has the same characteristics as a high resistance coil.


Wattage is very similar to voltage, however instead of adjusting the input (voltage) you’re adjusting the output. This means you just tell the device how much power you want to output and it adjust everything else automatically. For example if you have a 1.8 Ohm coil running at 3.7 volts you’ll get an output of around 7.3 watts. However, if you change the coil to a higher resistance of 2.8 Ohm you will notice a considerable decrease in flavour, vapour production and heat, as the wattage will be lower around 4.4 watts. As a result you will have to raise the voltage to bring the wattage back up. Whereas when using wattage mode it will automatically raise the voltage to keep the wattage at the same power.

Back to the top