Resistance question

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Sdonal

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Mar 22, 2016
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Okay I have been vamping for a while now but I have recently started trying my hand with rdas. My question is what changes what your resistance is when building the coil? More or less wraps thinner or thicker wire? Second question is what difference does it make with the different types of wire, I see a lot of like twisted or Clapton or staple and whatnot and I just wondered what difference those make vs just regular kanthal? Thanks for the help!
 

The Cloud Minder

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Resistence is futile!
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Baditude

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Coils, Wicks, and Vapor Production:
Vapor production comes from a combination of net coil surface area, wicking and juice type, air flow... and the wattage necessary to heat that net coil surface area. If you're lacking in any of those areas, you'll come up short.

Just a few basic points, for your consideration... some IMO, some incontrovertible fact.

  • The gauge of wire and overall length of that wire is what determines resistance. Coil count is irrelevant.

  • Thicker gauge wire, for a given net resistance, where the finished coil(s) physically fits in the atomizer, provides the greatest surface area.

  • Thicker wire, for a given net resistance, runs cooler than thinner wire, for a fixed wattage value.

  • For a given net resistance, thicker wire requires more wattage to obtain the same heat flux (coil radiant heat) as thinner wire. Thinner wire, although it reduces surface area, can be used to raise heat flux where adjustable wattage (mech mod) is not an option.

  • Higher wattage, for a given net resistance, produces more heat, and requires both better air flow and optimized wicking.

  • "In-coil" wicking that is "loose" vs. "tight" is almost always a better choice, as overly tight fits can choke off the capillary action of the wicking medium.

  • Plain old cotton balls can be "unrolled" perpendicular to the grain, to produce a flat strip of cotton.

  • Always roll cotton wick in parallel with the cotton "grain".

  • In an RDA, high VG juice will produce thicker "cloud" density.
(--Thanks to State o" Flux)
 

alcarl

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Coils, Wicks, and Vapor Production:
  • The gauge of wire and overall length of that wire is what determines resistance. Coil count is irrelevant.
Please correct me if I'm wrong. By "coil count" you mean the actual number of wraps on a single coil, correct? Meaning 2" of wire is 2" of wire? I just don't want the OP to be confused (I know you're aware more coils [not wraps] lowers the total resistance, Baditude).
 
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