I have a couple questions. To figure out wattage do I take my voltage and multiply it together and divide that by my atty ohms? Also i have a variable voltage mod, so can i always just buy the same atty ohm wise and use my voltage spinner to get the right watts? I just ask because i see a lot of people on here that use more than one kind atty (ohm wise).
Ohms, Volts, Watts
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Yes, formula is correct. Wattage = voltage^2 / resistance
Ramp up of voltage from low to high is actually a better way to use the mod. This will allow more gradual break-in of new atomizer head. Also, when you are new to this, it will help you to notice the difference.
Selection of resistance level is highly personal and heavily depended on the juice type. Darker/thicker juice burn better at high ohms. You get more flavor from thiner juice on lower resistance. I would highly recommend to try out different resistance level and find your sweet spot. It is shame most tank vendors are sending with 2.5ohms heads.
Also, never trust the "stamped" resistance level of atomizer head. Quality control on these are horrible and the actual resistances are mostly different from stamped.
Ramp up of voltage from low to high is actually a better way to use the mod. This will allow more gradual break-in of new atomizer head. Also, when you are new to this, it will help you to notice the difference.
Selection of resistance level is highly personal and heavily depended on the juice type. Darker/thicker juice burn better at high ohms. You get more flavor from thiner juice on lower resistance. I would highly recommend to try out different resistance level and find your sweet spot. It is shame most tank vendors are sending with 2.5ohms heads.
Also, never trust the "stamped" resistance level of atomizer head. Quality control on these are horrible and the actual resistances are mostly different from stamped.
Basically, yes.
Voltage X Voltage / Ohm = watts
Yes, with variable voltage you can adjust the voltage to the atty and you can try different ohm attys at different voltages to see what works best for you. Different liquids taste better with different attys and temperatures.
*Tip - If you use a lower ohm atty you can reduce your voltage and your battery will last longer between charges.
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Disclaimer: This is the most simplistic explanation and is addressed to new vapers mostly or vapers who are happy within the recommended "just right" power zone (4.5-8 watts). If you are using dual coil atomizers or are interested in high wattage vaping, it's a different conversation altogether. 
You will also have to understand the concept of amp limits and how it applies to high power vaping. In short, dual coil atties consist of two coils configured in parallel, which means that a 2.1Ω atty is really two 4.2Ω coils--so calculate your wattage based on the 4.2Ω number--not 2.1Ω--roughly. To make it simpler--dual coil atties require more wattage than singles, but not quite twice as much. They produce more vapor due to increased surface. When in doubt--start low and adjust up as needed.
Ohm's Law as it pertains to vaping is really not that complicated--and it's very useful when you want to know what you're doing.
Voltage and wattage are often misunderstood by new vapers. Wattage is the power (heat, sweet spot) that your PV (battery and atomizer) generates. Wattage = Voltage (of your battery) squared divided by Resistance (Ω) of your atomizer [P=V[SUP]2[/SUP]/R]. If you're not good at math, don't worry, use this easy calculator:
Online Conversion - Ohm's Law Calculator
Of course, if you own a VW (variable wattage) device, you don't really need this calculator because your device will do the math for you.
The wattage you want, especially at the beginning of your vaping career, should be somewhere between 4.5 and 8.5 Watts. Anything lower than 4.5 watts may not vaporize your juice properly and will not produce enough warmth and vapor. Anything above 8.5 watts increases the risk of burning the filler in your cartomizers (if you're using them) and even some juices, especially the delicate ones.
There are, of course, other variables, like eliquid and JDD (juice delivery devices) that you're using on your batteries. Seven watts on a filler type cartomizer may feel different than the same 7 watts on a fillerless clearomizer or a dripping atomizer. The same is true for different eliquids; tobaccos, chocolate and coffees generally require more wattage (heat), while fruit and other delicate flavors do better with less heat. Everyone's sweet spot is different--those are just very general guidelines.
Experiment and you'll find your own bliss in no time!
The chart below is a good guide to safe vaping, even though some think it's a bit conservative.
You will also have to understand the concept of amp limits and how it applies to high power vaping. In short, dual coil atties consist of two coils configured in parallel, which means that a 2.1Ω atty is really two 4.2Ω coils--so calculate your wattage based on the 4.2Ω number--not 2.1Ω--roughly. To make it simpler--dual coil atties require more wattage than singles, but not quite twice as much. They produce more vapor due to increased surface. When in doubt--start low and adjust up as needed. Ohm's Law as it pertains to vaping is really not that complicated--and it's very useful when you want to know what you're doing.
Voltage and wattage are often misunderstood by new vapers. Wattage is the power (heat, sweet spot) that your PV (battery and atomizer) generates. Wattage = Voltage (of your battery) squared divided by Resistance (Ω) of your atomizer [P=V[SUP]2[/SUP]/R]. If you're not good at math, don't worry, use this easy calculator:
Online Conversion - Ohm's Law Calculator
Of course, if you own a VW (variable wattage) device, you don't really need this calculator because your device will do the math for you.
The wattage you want, especially at the beginning of your vaping career, should be somewhere between 4.5 and 8.5 Watts. Anything lower than 4.5 watts may not vaporize your juice properly and will not produce enough warmth and vapor. Anything above 8.5 watts increases the risk of burning the filler in your cartomizers (if you're using them) and even some juices, especially the delicate ones.
There are, of course, other variables, like eliquid and JDD (juice delivery devices) that you're using on your batteries. Seven watts on a filler type cartomizer may feel different than the same 7 watts on a fillerless clearomizer or a dripping atomizer. The same is true for different eliquids; tobaccos, chocolate and coffees generally require more wattage (heat), while fruit and other delicate flavors do better with less heat. Everyone's sweet spot is different--those are just very general guidelines.
Experiment and you'll find your own bliss in no time!
The chart below is a good guide to safe vaping, even though some think it's a bit conservative.
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