Dual-Coil dripper - finding total resistance?

[Tanks]

Hey guys, after yet another analog relapse, I'm back in full effect.

First off, I checked the first 3 pages of this sub-forum and didn't see anything covering what I'm asking; if this has already been covered, I apologize for re-posting.

Question: When building a dual coil setup do you add the resistance of both coils together to find the total resistance of your atty (i.e., if you have two 0.5ohm coils would your atty be 1.0ohms or would it only be 0.5ohm??

If you DO add the resistance of both coils together how do mechanical perform with something like a 2.0ohm setup (will it perform better than a single 2.0ohm coil?)?

I have a Multimeter but I cannot measure at the coil (I mean I can only measure 1 coil at a time) unless I measure impedance at the 510 connection (should I just measure at the 510 connection? Would measuring at the 510 connection be better, i.e., would it giuve a more accurate reading of what resistance the PV is seeing?)

Thank you all in advance for any help!

tanks

 

[DDN79]

I usually can get a reading through one on the positive and just ground it out ont he atomizer somewhere

 

[Jazzi Mike]

With a dual coil setup, the resistance is halved. So a 1.5 ohm DC coil is two 3 ohm coils. You have to ensure that both coils are the same resistance with a DC build. Otherwise, one coil will get hotter than the other one.

 

[shroom]

If you want to build 1ohm double coil each coil has to be 2ohm. Think about electricity as water rushing through pipes, smaller the pipe more resistance more parallel pipes reduce resistance.

 

[JacobO]

Test at the 510 connection or you can test one coil at a time on the positive and negative posts to make sure they are the same

 

[armoworrior]

With a dual coil setup, the resistance is halved. So a 1.5 ohm DC coil is two 3 ohm coils. You have to ensure that both coils are the same resistance with a DC build. Otherwise, one coil will get hotter than the other one.

Thats only true for coils in parallel not coils in a series. Which keeps the resistance. We dont buld in a series very often so we don't worry about that too much.

 

[Tanks]

Thanks everyone!

Thats only true for coils in parallel not coils in a series. Which keeps the resistance. We dont buld in a series very often so we don't worry about that too much.

This is what I thought and you're right I'm doing them in series; it will be 2 separate coils (the IGO-W has 1 positive post and 2 negative posts so I can do 2 separate coils).

Thanks again everyone!


Sent from my SAMSUNG-SGH-I337 using Tapatalk 2

 

[grindle]

Nope, using both posts would be building in parallel. The circuit of both coils ends on the positive post - resistance is halved.

 

[Yellow Hawk]

The formula for total resistance in parallel, is 1/Rt= r/R1+1/R2+1/Retc.
Just follow the formula, EASY, Retc, just means 1/all the rest of the resistances in parallel. so For a dual coil, it would be 1/Rcoil-1 +1/Rcoil-2=1/Rtotal It's a simple formula, follow it.

Yellow Hawk

 

[UncleChuck]

Nope, using both posts would be building in parallel. The circuit of both coils ends on the positive post - resistance is halved.

This ^

Every dual coil atty is setup to run coils in parallel, which halves resistance.

If you have two coils, each 1 ohm, your total resistance will be .5 ohm.

 

[Yellow Hawk]

Yup, do the formula, it will bear that out

 

[gpang788]

Or use this parallel resistance calculator if lazy:

Parallel Resistor Calculator R1 + R2 = equivalent resistor R resistance equiv total resistor finder made easy piggyback = parallel - sengpielaudio Sengpiel Berlin

 

[Yellow Hawk]

I'm a Dr. for GODS sake, WHO wants EASY! and I LOVE math/calc./Trig./abstract Math/Hyperbolic Geo. etc. One HAS to love those formulae.