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Vape pen ohms

Ohm’s Law: A Brief Guide for Vapers

Vapers who use mods have a lot of new terminology to learn. With people throwing out words like watts, ohms, amps and volts as if they’re common knowledge and talking about things like Ohm’s law that you’re lucky if you remember from high school physics, feeling overwhelmed by it all is pretty common. But the good news is that it doesn’t take long to get up to speed with the basics you’ll need to safely and effectively work your mod. So here’s a brief guide to everything you need to know to get started with your VW or mechanical mod.


Watts, Volts, Amps and Ohms: What Do They Mean?


The first thing you need to know is what all of the key terms used in Ohm’s law actually mean. You might have an idea about volts and watts already, but these simple definitions should tell you what you need to know.


  • Volts: Volts are a measure of the electrical potential between two points. In a battery, for example, there is one end with positive charge and one end with negative charge. The difference between charge at these two ends means that if you connect them using a wire, current will flow down the wire. The voltage tells you how big the charge difference is and therefore how big the current will be. More volts give your vaping device a bigger “push” to get the current going.
  • Amps: Amps are a measure of electrical current. In the same way that you call running water a current, an electrical current is a flow of electrons through a wire or conductive material. The current flowing through your coil is what makes it get hot and turns your liquid into vapor. You’ll need to know the number of amps your setup is drawing from your battery to ensure you stay safe when you’re vaping.
  • Ohms: Ohms are a measure of the resistance to the flow of current. If you imagine water flowing through a pipe as being the electrical current, resistance is like the friction between the water and the insides of the pipe. Volts kick-start the current and ohms slow it down. Your coil has resistance, and this is really why it gets hot when current flows through it. For the same voltage, a higher resistance means less current.
  • Watts: This is a measure of electrical power. This is basically the amount of energy passing a point in the circuit per second. Most regulated mods these days are variable wattage, so you set the number of watts you want to send to your coil. The wattage calculation takes the resistance and voltage in account for you, so it’s really easy to get the right setting with VW mods. Generally speaking, a higher wattage means more vapor.


Why Ohm’s Law Matters


Vapers often give the advice that “you should learn Ohm’s law before you start vaping with a mod,” but in some cases they don’t really explain why. Ohm’s law tells you the relationships between voltage, current, resistance and power, and so it is central to how vaping works.


The main reason that Ohm’s law is important is working out how much current your coil will draw from the battery. This is important because batteries can only safely provide so much current. This amount of current is called the “maximum continuous current” for the battery, and you need to make sure you stay under this number when you’re vaping. It’s best to avoid drawing the maximum current you’re allowed to, but realistically as long as you stay within the limit you’ll keep vaping safely.


The only extra piece of information you need (which won’t be shown on your mod) is the maximum continuous current of your battery, which you can find through a Google search, on the site you bought it from or other places like Steam Engine (check the drop-down menu beside “battery presets”).


You can also use Ohm’s law to work out the wattage you’re vaping at if you don’t have a regulated mod or a VV/VW device, too.


Using Ohm’s Law for Mechanical Mods


Mechanical mods don’t have the same in-built protections you’ll find on regulated devices, so using Ohm’s law before vaping using them is particularly important. Mech mods don’t read the resistance of your coil, though, so you have to test your coil on a regulated mod or dedicated ohm reader before you attach it and try to vape.


Once you know the resistance of your coil, you can use the following form of Ohm’s law:


I = V / R


Or, in words


Current = voltage / resistance


If you have a single-battery mechanical mod, the fully-charged voltage is 4.2 V, and it decreases as the charge drains. You should always use the full voltage when you do calculations, though. Here’s an example calculation using a 0.5 ohm coil:


I = V / R = 4.2 V / 0.5 ohms = 8.4 amps


This is well within the capabilities of most 18650 vaping batteries, and many offer up to 30 amps of continuous current. The same calculation with a 0.2 ohm coil works out at 21 A, so as long as you have a very capable battery this can be done safely too.


If you want to work out wattage (i.e. power = P), use this version of Ohm’s law:


P  = V2 / R


So in the example above:


P = 4.2 V × 4.2 V / 0.5 ohms = 35 W


Using Ohm’s Law for VV/VW Mods


Although the previous section is what most vapers know, calculating Ohm’s law for VV/VW mods is a bit different. Instead of the version above, you need to use:


I = P / V


So current = power / voltage.


When you’re using this version of the equation, the minimum voltage is the most important thing to use, rather than the maximum. A regulated mod sometimes needs to “boost” the voltage to put out a certain amount of watts, but batteries top out at 4.2 V per cell. To account for this maximum, they increase the current drawn. The less voltage remaining in the battery, the more they have to do this to make up for the difference.


You can calculate the current for anything but really low voltages by using 3.7 V, but if you want to be extra-careful you can go down to 3 V or even 2.5 V. Using one battery vaping at 75 W, this shows:


I = P / V = 75 W / 3.7 V = 20.3 A


Or with a bigger safety margin for a “worst case scenario” calculation:


I = P / V = 75 W / 2.5 V = 30 A


This gives you an idea of why many single-battery mods top out at 70 or 75 W, or 150 W for dual-battery mods. It’s the safest way to go based on some worst-case assumptions.


Ohm’s Law Calculators


This post should have shown you that it really isn’t hard to work out what you need to know to vape safely. However, there are plenty of Ohm’s law calculators you can use to take the work out of the process.


Steam Engine’s battery drain calculator is a really good tool, with presets for the most widely-used vaping batteries and modes for both mech mods and VV/VW devices. There’s another simple option at Li-Ion Wholesale too for regulated mods. As well as this, there are many vaping apps that can perform these same functions and more.


Ohm’s Law Matters, But It’s Easy to Use


The good news is that while Ohm’s law is important, it’s easy to work out what you need to know, and most regulated mods have plenty of safety features built in to protect you anyway. If you don’t want to do the math yourself, there are plenty of tools to take some of the work away, and as long as you get a capable battery (with a high maximum continuous current), you’ll find you rarely (if ever) have anything to worry about anyway. But it’s better to understand why you don’t have anything to worry about most of the time to walk blindly into a potential problem.

Lee Johnson

Lee Johnson

Writer at Black Note
Lee is a writer and vaper from the UK. He quit smoking (without intending to) when he started vaping in 2012, and now writes for EcigaretteReviewed and E-Cigarette Direct's Ashtray Blog. He's always searching for a new all-day vape, loves rebuilding and is passionate about providing smokers with accurate information about the harm reduction potential of vaping. He drinks too much tea.
Lee Johnson



What is E-Juice?

E-juice, also known as e-liquid or vaping liquid, is the liquid that’s placed in the vaping device and subsequently atomized into vapor. When you go to buy e-juice, you’ll notice it contains a mix of several ingredients. These typically include vegetable glycerin (VG), propylene glycol (PG), some type of flavoring, and nicotine.

VG and PG form the base of the e-liquid. VG is a component used in food and personal care products; its role in e-liquid is to create a thick, dense vapor. PG is another popular solvent used in a variety of everyday items. It carries the e-liquid flavor, provides the “throat hit,” and enhances the vaping liquid’s ability to soak into wicks or cartomizer materials.

Nicotine is an optional ingredient, often available in different levels. E-juice also contains some type of flavoring.

Black Note leads the pack of tobacco vaping liquid by using only natural flavoring – extract from real tobacco leaves to produce real tobacco taste. When you go to buy e-juice from other companies, you may find any number of chemicals used to create synthetic flavors that include fake strawberry, manufactured vanilla, and even man-made tobacco flavors.

If your aim when you buy e-liquid is to experience the subtle nuances, genuine flair and authentic taste of real tobacco, then you’ll be on the mark if you buy e-juice from the Black Note lineup.

Best E-Juice

When you’re going to buy e-liquid, it’s only natural you’ll want the best e-liquid. But what, exactly, does it “best e-juice” mean? We’ll tell you.

For starters, you’ll want an e-juice that doesn’t contain all kinds of strange chemicals and concoctions that you can’t even pronounce. True, even the best e-liquid will contain vegetable glycerin (VG) and proplene glycol (PG), which serve as the base of e-juice, but you don’t necessarily need a host of other chemical compounds.

The best e-juice will stick to natural ingredients, like real tobacco extract, rather than rely on synthetic flavorings, colorings and other additives. Diacetyl is one of those synthetic ingredients that has gotten a pretty bad rap, although its use is not all that uncommon for producing sweet e juice flavors.

Definitely read the ingredient list before you buy e-juice to ensure you recognize what’s on it. Better yet, see if the e-juice company offers a lab report to confirm what’s actually inside the e-liquid.

In addition to having as few chemical ingredients as possible, the best e-juice will have an amazing taste. For those who enjoy authenticity over imitation, the most amazing taste is the most natural taste, especially when it comes to tobacco. Since Black Note uses real extract from tobacco leaves, we not only avoid all those weird chemical flavorings, but we also produce the most authentic experience: tobacco vaping liquid that actually tastes like tobacco.

Best E-Liquid on the Market

Anyone looking for the best e-liquid on the market need look no further than Black Note. Black Note tobacco vaping liquid ranks as the best e-juice across the board in every category, starting with the taste.

Black Note’s main claim to fame is producing a tobacco vaping liquid that actually tastes like real tobacco. That because we use real tobacco extract, not chemicals, to create the best e-juice tobacco flavor. Using extract from real tobacco leaves retains tobacco’s nuances and flavor notes, giving you the most authentic and multi-faceted tobacco experience.

In addition to being the best e-juice for tobacco taste, Black Note also has the best e-liquid manufacturing process. We spent years researching and testing various production methods, and finally landed on one that we believe is absolutely perfect.

It starts with growing carefully selected tobacco seeds, followed by an equally precise of steps that include an extensive natural extraction process. Even our bottling and packaging is done with the utmost care, using recycled and recyclable packaging materials to ensure our products are as earth-friendly as they are vapor-friendly.

One more category where Black Note ranks as the best e-liquid is with the value. Every order comes with free domestic shipping, one-to-three day domestic shipping guarantee, and a 90-day, money-back satisfaction guarantee. If you’re not happy for any reason, or don’t agree we’re the best e-juice on the market, send it back on us and we’ll refund your money.

Vape Juice Ingredients

Vape juice ingredients can be pretty straightforward – or not. At the very least, most vape juice contains propylene glycol (PG), vegetable glycerin (VG), and some type of flavoring. Nicotine has largely become an optional ingredient that can be included at varying levels or left out altogether.

Vegetable glycerin (VG) and propylene glycol (PG) are usually the two main ingredients that make up the base of most vape juice.

VG is a plant-based substance with the ability to produce a dense, thick vapor. PG is an additive found in many food items and certain medicines. It carries the flavoring, provides the “throat hit” and enhances the vape juice’s ability to soak into the wicking materials.

Nicotine levels can vary, as can ingredients that make up the flavorings. The components that make up vape juice flavoring are where ingredients can get rather complicated.

Vape juice that relies on artificial flavorings can contain any number of extraneous chemicals and other additives, whatever it takes to recreate the flavor the ecig juice is going for.

Black Note uses only natural flavorings: extract from real tobacco leaves. That keeps our ingredient list incredibly simple, backed by a lab report to prove it. You won’t find any strange chemical concoctions used to produce our tobacco flavor, just real tobacco extract that delivers a real tobacco experience.

What is the Best Flavor for Ecig Juice?

From strawberry shortcake to banana rum, ecig juice comes in tons of flavors. While folks can debate and discuss all the fruity, sweet or food-like flavors all day long, the best flavor for e-cig liquid is straight-up tobacco.

Why? Vaping was originally created as an alternative for traditional cigarettes, mainly for those who enjoy the taste of tobacco. And when you can find an e-cig liquid that is able to recreate tobacco’s full-bodied yet delicate flavor notes and nuances, but without the harmful chemicals found in cigarettes, then you’ve found the best ecig juice.

Recreating tobacco’s complex flavor isn’t easy, especially when it’s attempted with artificial ingredients. That’s why Black Note sticks to the real thing, extracting the essence of real tobacco leaves to flavor our vaping liquid. Not only does this avoid the harmful chemicals in cigarettes, but it also eliminates the flavoring chemicals found in many ecig juices. The end result is real tobacco taste, an authentic tobacco experience and the best flavor for ecig juice you can find.

Notice also we said the best e-cig flavor was straight-up tobacco, not plain old tobacco. Black Note’s real tobacco vaping liquid happens to come in a variety of different blends, from the light and airy to the peppery and robust. Not all tobacco is created equal, and different blends capture the specialized subtleties that make each tobacco unique.

Best Sweet Tobacco E-Juice

When it comes to sweet tobacco e-juice, your options can be broken down into two categories.

The first category contains tobacco e-juice that overlays the tobacco flavor with artificial chocolate, caramel, vanilla, fruity or other dessert-like flavorings. We wouldn’t classify any such flavors as the best tobacco e liquid, simply because they typically use chemicals and other artificial ingredients to create the tobacco taste, the sweet taste, or both.

The second category of sweet tobacco e-juice is where you’ll find the best tobacco e-liquid, sweet or otherwise. This category contains vaping liquid created using only natural flavorings, which is exactly where Black Note fits in. Instead of concocting flavors using synthetic ingredients, Black Note uses an extensive extraction process that slowly and deliberately extracts the tobacco essence from real tobacco leaves.

The result is the best tobacco e-juice: tobacco vaping liquid that actually tastes like real tobacco. And if you’re going for the best sweet tobacco e liquid, we have a few tobacco blends that offer varying levels of sweetness.

Prelude is our sweetest tobacco e-liquid, containing golden Virginia tobacco. Made from fire-cured dark Virginia tobacco, Sonata is our Cavendish blend with a mildly sweet and nutty flavor. Solo is our menthol blend, giving you a semi-sweet minty taste created from natural menthol crystals extract from dried mint leaves.

For the best tobacco e-liquid that’s naturally sweet and remarkably delicious, Black Note is at your service.

WARNING: Black Note products are not smoking cessation products and have not been tested as such. Black Note products are intended for use by adults of legal smoking age (21 or older in California), and not by children or women who are pregnant or breastfeeding. Black Note products contain nicotine, a chemical known to the State of California to cause birth defects or other reproductive harm. Ingestion of the non-vaporized concentrated ingredients can be poisonous. Keep out of reach of children and pets. For immediate advice, contact poison control center: (800) 222-1222