So the way I see it, just wire diameter and length decide OHM. Does coil size diameter also affect this? Also, spacing?
Factors affecting oms.
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Coil diameter will larger diameter means more wire will be needed to make a wrap around it.
Wire length is the important part of the equation. It doesn't matter what you wrap it around or how many wraps, each piece of wire you use has a fixed resistance per inch. Only way to vary the resistance is to vary the length.
Of course you vary the length by adding wraps or using a larger diameter mandrill (or changing the gauge) but the basic principle is the length of the wire controls the resistance.
Of course you vary the length by adding wraps or using a larger diameter mandrill (or changing the gauge) but the basic principle is the length of the wire controls the resistance.
factors that effect the ohms are...
material composition, cross sectional area, length, and heat..... shape not too much unless you start talking about enuf to induce inductive effects but that is way beyond the realm of our use....
material composition, cross sectional area, length, and heat..... shape not too much unless you start talking about enuf to induce inductive effects but that is way beyond the realm of our use....
Yep, for a single coil, it's just wire gauge (the diameter of the wire itself, not the wound coil) and the total length of wire used. If you take the same 1.5 inches of 28ga and use a 2mm diameter, or a 10mm diameter, the resistance will be the same. Of course, these two coils will not have the same number of wraps, yet have the same resistance.
For a fixed inner diameter (ID) and wire gauge, the number of wraps is a good proxy for the resistance.
For a fixed inner diameter (ID) and wire gauge, the number of wraps is a good proxy for the resistance.
they do get affected but thats when one starts making 100's to 1000's of wraps....
I read the scientific reference somewhere about length is all that's important
( lol thats what she said) in a given gauge ( same thickness -- ( ok one more time thats what she said hahah) ok
but I have also hit some references and professionals that insist that coiling additionally affects resistance.
Thusly :: Two same length pieces of kanthal wrapped completely differently will assuredly have different ohm ratings / resistance
granted I'm a noob but c'mon here -- really that makes sense
( lol thats what she said) in a given gauge ( same thickness -- ( ok one more time thats what she said hahah) ok
but I have also hit some references and professionals that insist that coiling additionally affects resistance.
Thusly :: Two same length pieces of kanthal wrapped completely differently will assuredly have different ohm ratings / resistance
granted I'm a noob but c'mon here -- really that makes sense
Thusly :: NO
Same length, same gauge wrapped differently will have the same resistance.
Will different geometry coils of the same resistance vape the same? Generally not. But if they start and end at the same length (and same gauge, of course) the resistance will be the same. Coil design can affect performance, but not resistance.
resistance change due to coil design is real but as previously mentioned.... when one uses 1000's of feet of it and 1000's of wraps.... but in our use of coils... the change is sooo small its undetectable.... kinda like trying to determine if there is a taste difference in 36.0 and 36.000001 nic
I respect that.. I'm a noob with lil 2 no electrical exp... The literal quote I was given was ...two wires at .85 inches long each coiled
differently (different diameter coils or number of coils) will create different resistance,
however your saying ( I'm just re iterating your statement ) that the resistance will be the same
but they will perform differently ... I.E. Vape differently..
Shall we explore why that is...... # coils & Coil diameter / vapor production differences with voltage & wattage constant ??
Not arguing .....please understand... just striving for a better understanding for myself and the OP.
all corrections and insight are greatly appreciated !!!!
I think the Professionals I questioned at church were referring to Bunnykiller's answer above with megga spans and giant coiling designs...
I.E. almost negligible in our macro universe of tiny little coils ( I think..... remember I personally know NOTHING)
I however was considering a more macro vape concern like the crazy "twisted messes" coils from you tube.
But my first REAL answer as I searched this very question a few weeks ago agrees ---- length determines resistance PERIOD
.. thats what actually got me wondering about the various coil designs versus resulting Ohm readings..
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in a nutshell... yes length is the basic parameter of resistance given that all other parameters remain the same... the longer the wire the more the resistance... looped or not... in our application 
Different coil geometries, or coils with the same resistance but more or less wire (due to different gauge), will have different amounts of surface area. The more surface area, the more wick and juice can be in contact with the heat. So some performance differences may be apparent when vaping.
Thicker gauge for the same resistance will, of course, require more turns to the coil, so have more surface area. But bigger wire will also take longer to heat - and cool. (While you can go "big" on a rebuildable, if you're rebuilding, say, Kanger heads, you can quickly get to the point where it won't fit for the desired resistance.)
So for practical purposes, it might be best to build several different types and gauges to see what you prefer
Thicker gauge for the same resistance will, of course, require more turns to the coil, so have more surface area. But bigger wire will also take longer to heat - and cool. (While you can go "big" on a rebuildable, if you're rebuilding, say, Kanger heads, you can quickly get to the point where it won't fit for the desired resistance.)
So for practical purposes, it might be best to build several different types and gauges to see what you prefer
in a DC circuit one does not have to account for inductive reactance.
however if your variable voltage or wattage device is using pulsed DC
than depending on pulse width and frequency it could induce an
inductive resistance.
i haven't heard of that happening but it could explain some of the
stranger problems i have heard here.
regards
mike
however if your variable voltage or wattage device is using pulsed DC
than depending on pulse width and frequency it could induce an
inductive resistance.
i haven't heard of that happening but it could explain some of the
stranger problems i have heard here.
regards
mike
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