Parallel coil question

[Amnesiac]

Hi guys... quick question regarding parallel coils, I just started using the Athena squonk mod, got paranoid and asked the other day about what I needed i.e coil resistance for my battery etc... anyway that's all good, built safe and squonked away for the day... now I'm finding the vape is just really poor and not as satisfying as my regulated rda setup, I know it's because I only have a 20a battery and am limited with what I can do... anyway, sorry for waffling on, basically I decided to try a single parallel coil instead and it's so much better but I'm now paranoid I'm drawing too much ampage... so essentially my question is... do you half resistance/double amp draw before or after taking an ohm meter reading... single parallel coil is reading 0.24 ohms and I'm using a Samsung 18650 25r single battery mech... thanks in advance, hopefully that makes sense

 

[Deleted member 58360]

By parallel coil do you mean two pieces of wire wound together into one coil?


On the majority of rdas, a pair of coils is half the resistance of one coil - so if one is giving you 0.24 ohms then a pair would be 0.12 ohms - 35A draw, well over the accepted limit of a single 25r.


You do nothing with halving or doubling anything after taking a resistance reading - it is what it is. Well, that's if the reading is taken from your build, which it should be (not from a label or a bare coil).

 

[Amnesiac]

yeah it's two strands wound into one coil which measured 0.24... so this should be fine at 17.5 amps but if I ran it dual it would be 35... is that right? Thank you : )

 

[Deleted member 58360]

View attachment 203833 yeah it's two strands wound into one coil which measured 0.24... so this should be fine at 17.5 amps but if I ran it dual it would be 35... is that right? Thank you : )

Yes, pretty much.

 

[Tootlevape]

The total resistance of 2 parallel resistors is half the resistance of one of them ONLY if both resistors are equal.
Otherwise (2 different resistors) the formula is 1/Rt = 1/R1 + 1/R2

 

[Deleted member 58360]

The total resistance of 2 parallel resistors is half the resistance of one of them ONLY if both resistors are equal.
Otherwise (2 different resistors) the formula is 1/Rt = 1/R1 + 1/R2

Don't confuse this with a parallel wound coil as in the photo.

It may be parallel wound, but it's one resistive element.

 

[Amnesiac]

Thank you for the help

 

[Tootlevape]

Don't confuse this with a parallel wound coil as in the photo.

It may be parallel wound, but it's one resistive element.

I know that. The op then asked would the current draw be 35amps if he doubled the parallel wound coil. I was merely pointing out that both coils need to be exactly the same before you can start making the half resistance and double current assumptions.

 

[Deleted member 58360]

I know that. The op then asked would the current draw be 35amps if he doubled the parallel wound coil. I was merely pointing out that both coils need to be exactly the same before you can start making the half resistance and double current assumptions.

Yeah, meant to tag op - wasn't directed at you