if you compensate for resistance with voltage, what difference does it make?

[yinsen]

hey again chaps, ,

I built my first coil last night, and a noob question struck me.

if you use different voltage/wattage (in a kicked/vv mod) to compensate for a high or low ohm coil, what difference does the resistance even make, assuming a single coil with similar dimensions?
like, if you have a high resistance coil, you apply more power to get around that - so why is it actually relevant what ohms the coil ends up at if you kind of circumvent it anyway?

thanks!

 

[bacc.vap]

Probaby little difference assuming the ohms are'nt to low/high to be effectively used by the device.

 

[The Ocelot]

Amps, baby, amps.

 

[edyle]

hey again chaps, ,

I built my first coil last night, and a noob question struck me.

if you use different voltage/wattage (in a kicked/vv mod) to compensate for a high or low ohm coil, what difference does the resistance even make, assuming a single coil with similar dimensions?
like, if you have a high resistance coil, you apply more power to get around that - so why is it actually relevant what ohms the coil ends up at if you kind of circumvent it anyway?

thanks!

That's why VV mods were invented.
If you change resistance, you adjust voltage.

Then VW mods were made.
If you change your replacement coil, and it happens to be a different resistance, it compensates the voltage for you so as to get the same wattage.

 

[yinsen]

that makes sense.

to clarify:

is there no difference in performance from a very low resistance coil and very low power to a very high resistance coil and very high power?

 

[itskohler]

Nope. That's the point of a high power device.

 

[Bunnykiller]

that makes sense.

to clarify:

is there no difference in performance from a very low resistance coil and very low power to a very high resistance coil and very high power?

replace the word power with volts and you are correct ( power = watts)

 

[edyle]

that makes sense.

to clarify:

is there no difference in performance from a very low resistance coil and very low power to a very high resistance coil and very high power?

You can use a low resistance coil on low voltage or a higher resistance coil on higher voltage and get the same temperature coil, and therefore the same vape.

Is there a difference:
Well, usually the higher resistance coil would tend to take a longer time to heat up.

The low resistance coil and the high resistance coil might be different gauge wire, or different length wire or both; these factors do make a difference, moreso to the experienced vaper than somebody new.

 

[dice57]

Response time to heat up is less with lower ohm builds. Also if you want to get up past 30 watts, then ohms, amps, coil size and geometry makes a major impact.

True, with high amp regulated mods, ohms is not as critical, but I like most my rba's to vape great when on a regulated or mechanical mod, so usually aim for 0.5-0.7.

It's a balancing act actually. Need to balance ohms to amps available to max volts output, to produce the watts one desires to vape at.

If your a one mod guy, then you are right, it doesn't really matter, but taste can vary, and, and, and..... But when I build its with a specific rba being built and which mod or mods I'll be firing it with. Some of my builds are mech only, some play nice on everything. All depends what I am building.

 

[JeremyR]

One main difference is the high ohm at higher voltage to reach your desired watts is a lower amp drain causing your battery to last much longer like twice as long for the same wattage! On a vv *to the contrary* I find 32g to heat instantly on a zmax. Much faster heat up than heavier gauge lower ohm coils.

A 2.7-3.0 ohm 32 even heats instantly, there is less mass to heat. With heavy gauge say 1.7 of 28 on vv/vw is heatsgAuge slower due to the mass of wire and power available unless you hit it with maximum voltage. Most chips would need stacked batteries to hit 4-5amps to really pump the voltage to the heavy Gauge coil to get it to heat faster. There is a dead zone on heavy gauge. You need to be subohm for it to heat super fast. It takes a a lot of power to heat all that mass. Most vv are capped for power. Heavier gauge can give a richer vape but usually slower heat up on a vv. in the end a watt is a watt. It's all about how you get there.

If you care about battery run time, you will coil as high ohm as possible to get your wattage, this will give you maximum battery time. A 3 ohm coil at 12 watts will last twice as long as a 1.5 ohm at 12 watts(if you mod can achieve that much power to amp ratio)

Please review my power blog,

 

[edyle]

One main difference is the high ohm at higher voltage to reach your desired watts is a lower amp drain causing your battery to last much longer like twice as long for the same wattage! On a vv *to the contrary* I find 32g to heat instantly on a zmax. Much faster heat up than heavier gauge lower ohm coils.

A 2.7-3.0 ohm 32 even heats instantly, there is less mass to heat. With heavy gauge say 28 on vv/vw is heats slower due to the mass of wire and power available unless you hit it with maximum voltage. Most chips would need stacked batteries to hit 4-5amps to really pump the voltage to the heavy Gauge coil to get it to heat faster. There is a dead zone on heavy gauge. You need to be subohm for it to heat super fast. It takes a a lot of power to heat all that mass. Most vv are capped for power. Heavier gauge can give a richer vape but usually slower heat up on a vv. in the end a watt is a watt. It's all about how you get there.

Actually, once you run the same wattage on different resistance coils on a vw mod, you're basically going to get the same usage out of the battery.

You looked at the amps to the coil; the amps from the battery go to the electronics which draws high amps if you want high power.

 

[tj99959]

There is a lot more going on than just ohms law. You might want to look into the laws of thermaldynamics as well. Things like how much fluid is on the coil, and how much air is passing over the coil can actually make more of a difference than a change of volts or resistance.

 

[Bob Chill]

I wrap micro coils in the 2.2ohm range for my dripper and push 10-12 watts through it and get a nice big vape with no burning. Same ohm in a tank like a protank and I can't go above 7 watts or it starts to burn. Could be from wicking speed in the tank but there is a difference at the same ohm and vape quality depending on what delivery device you are using. At least in my experience.

 

[wi11n]

Response time to heat up is less with lower ohm builds. Also if you want to get up past 30 watts, then ohms, amps, coil size and geometry makes a major impact.

True, with high amp regulated mods, ohms is not as critical, but I like most my rba's to vape great when on a regulated or mechanical mod, so usually aim for 0.5-0.7.

It's a balancing act actually. Need to balance ohms to amps available to max volts output, to produce the watts one desires to vape at.

If your a one mod guy, then you are right, it doesn't really matter, but taste can vary, and, and, and..... But when I build its with a specific rba being built and which mod or mods I'll be firing it with. Some of my builds are mech only, some play nice on everything. All depends what I am building.

^^^Best Answer lower ohms gives a faster draw.
Higher ohms on regulated vv/vw has to build up the required voltage to produce your desired wattage(heat).
But as far as higher ohms/lower amps saveing battery life...only true to an extent, the longer button press will drain the battery aswell.

 

[Tinkiegrrl]

Some prefer the taste of higher ohms due to more surface area on the coils. More surface area = more juice vaporized at once. Other's want the the faster heating of lower ohms. I seem to like my cartos at 2 to 3 ohms and my Kayfun coils lower, at around 1.5.

 

[Dampmaskin]

It is not the voltage that has to build up; any half decent mod will reach the correct voltage in milliseconds.

"Coil lag" is caused by the resistance wire itself needing to build up temperature. The technical term for this is heat capacity.

Using the same wire thickness, more ohms means that you are using more wire (lengthwise), which means that the coil will take longer to heat up. This can be compensated for by using thinner wire, which incidentally also increases the resistance.

 

[dice57]

well yes and no. your 3 ohm coil will never see 30 watts, and if it did would have to boost to 9.49 volts. Then you are talking about the cost of power conversion to supply the volts, but if you take a 0.5 ohm build, and running 30 amp batts, there's no boost involved till bat drops below 4.1 volts, then it's minimal boost to keep it at a consistent 30 watts, and a 30 amp bat will power the dna at max till bat drop to 3.5 volts. 30 amps gives you more useable power for longer running time with less wear and tear on the battery. Like said tis a balancing act for watts one want to vape at.

 

[JeremyR]

Actually, once you run the same wattage on different resistance coils on a vw mod, you're basically going to get the same usage out of the battery.

Not trying to start anything, but... I would respectively, highly disagree edyle. Have you tried it? I have real world tested it over a year. On one 18650 2000 mah in a zmax v3, at 10 watts with a 1.5 ohm I get 4 hours at my vape rate. With a 3 ohm at 10w I get about 8 hours at the same vape rate. Nearly equal vape volume. How do you explain that. Try it your self you will see.. Just sayin that's my experience.

And yeah dice is a balance between all factors You need enough Power to heat the given coil fast. 32g heats easily, 26g takes a ton more power. So obviously your not grinch to get 30w on a zmax to power that heavy coil. That why people use mechs and that a totally different scenario.

I think a factor with coils that needs attention is the mass at the given ohm and will you have enough wattage to light up all that mass quick.

 

[wi11n]

My 0.4ohm coil lasts all day, probaly about 12hrs on a 2600mah 18650

 

[FireDragon1138]

There may be problems with the efficiency of the booster circuits in VV devices, that could explain people getting longer battery runtime with different resistance coils?