Ohm's Law is a rule regarding electrical processes, and if you are using RDA's, RBA's, TC, or mech MODs, it's really important to understand how it works and how it relates to vaping safety. It is especially useful in dealing with advanced DIY vape building, particularly coil building because it covers the basics on how the electronic principles work, so you will be able to build the most effective, most precise, and safest coils. If you purchase coils, this info is great to know as well, because buying the right coils is obviously important, however the more info you are armed with, the better.
Ohm's Law, in Simple Terms
In the simplest terms, Ohm's law is the relation between Volts, Amps, and Resistance, and how to calculate power which, is equivalent to the amount of heat produced, which will in turn vaporize the e-liquid.
Why You Need to Learn it
Batteries are potent little bearers of tremendous energy, and if not used properly, they can explode. If you are taking it into your own hands to learn the ins and outs of coil building and working with ultra powerful batteries, you need to understand Ohm's law. The flip side to understanding all the safety info is that you'll understand how your device and all of its inner workings do their thing even deeper; you'll be able to fine tune to create the most perfect experience.
Custom coils are basically resistors, and resistors work by resistance. Resistance is used to control electricity, and in the case of vaping, to slow down the current passing through the lines. Coils in vaping are akin to curves on a road; they help keep the traffic slower where needed.
Volts (V):This is the voltage difference, as in, the difference in electrical potential between two sources.
Current (I):Current is measured in Amps (A). This is the level of charge flowing through a surface, such as a wire, per second. Think of the standard concept of electricity, with electrons rushing down wires enabling power.
Resistance:Resistance is measured in Ohms (Ω). This is the term for what gets in the way of the electrons, what slows them down as they flow through the circuit. In the scope of vaping, everything has some resistance, except for very cold superconductors, hence why copper wires are the standard used as power cables because of their relatively low resistance. The resistance of most atomizers will be labeled, it's important to know that every other part of the circuit holds some inherent resistance as well.
In its simplest explanation, Ohm's law can be worded as “current = voltage divided by resistance,” or in mathematical terms as:
I = V / R
Voltage is the raw power capability, which gets reduced/ divided the resistance which will then produce the final current.
If you place values into these given spaces, the electrical current could be configured when vaping at 3.4 V with a 1.8 Ω resistance. Simply, 3.4 is divided by 1.8, which will come out as a rounded 1.9 A.
In the same frame of thought, the equation can be rewritten for other purposes if something else needs configuring, for example: voltage is equal to the current multiplied by resistance (V = IR), or resistance is equivalent to voltage divided by current (R = V/I).
In Vaping Terms
The atomizer basically serves as a heating coil, and it works because of the principle of electrical resistance; the energy from the “friction” within the circuit, creates heat. While heat is an important factor, power is even more important because it is what produces the actual vapor. Atomizer resistance converts some of the energy into heat, however there still needs to be a high level of energy flowing throughout the whole system. As the electrons flow through the wire, they will encounter resistance and produce heat, while the wattage, (the power) will tap into this and produce vapor as a result.
Because of this, we cannot stress the importance of experimentation to get the best vapor production, and if you're aiming for better performance, low resistance atomizers are the way to go.