ohms and voltage

[kirkhams10]

it seems a lot of people are suggesting low resistance/low volts is the way to go. i get that the ratio is what matters but wouldnt high v and ohm be more efficient? or do e cigs differ from regular electrical devices? example: at 120v 10 amps is similar to 480v 2.5 amps. wouldnt high voltage run on less amps and, essentially, less watts?

 

[Nataani]

Amps translate to heat, you need heat. The higher the amperage the more heat you get, so your trying to find the balance between voltage and resistance to get the right amount of amperage and thus heat for the air flow you have.

 

[Nataani]

ps. A lot of people run low resistance at quite high voltage. They do this with very large air holes to avoid a sickeningly hot vape.

 

[generic mutant]

Interesting question.

This is the theory I subscribe to:

http://www.e-cigarette-forum.com/fo...-not-matter-its-all-about-wire-temp-read.html

[very short version: for a given temperature, low resistance (high current) vaping increases surface area of coil, reduces coil pitch, creating a more even heating]

P.S. and yes, you are right, it is less efficient for a given wattage.

 

[Dakota Jim]

If you are using a regular fixed voltage ego style battery at 3.7 volts then the lower the resistance (ohms) of your coil will mean the higher the watts (heat - don't worry about amps until you are really experienced and are getting into mechanical devices)

Most people find that 7.5 watts is ideal for most eliquids for optimum flavor and vapor selection

3.7 volts and 1.5 ohm coil = 9.1 watts - too hot, burnt taste
3.7 colts and 2.2 ohm coil = 6.2 watts - too cold, muted flavor, poor vaper production
3.7 volts and 1.8 ohm coil = 7.6 watts - just right

(should I change my name to Goldi Dakota Jim?)

this is why VV (variable voltage) is so popular and why VW (variable wattage) is getting even more popular

VV - you can set the voltage to get the optimum flavor for the coil and eliquid you have
VW - you can just set the optimum wattage and the device will set itself to the correct voltage depending on the resistance (ohms) of the coil you have - much easier than memorizing an ohms-volt-wattage chart

hope this helps