can someone explain ohms to me?

[Jennyfromtheblock]

i currently use an EVOD with mini pro tank2 and the coils I use are 2.5 ohms (suggested to me by my local shop). I am looking to buy an stick 30w and either a nautilus mini or atlantis (still undecided). However I notice that the ohms for these coils are much less (.5-1.0 or something). What exactly are the ohms and why would one use 2.5 and another 0.5?
so confused

 

[BI00dR3D]

There is alot to learn here, just read read and then read some more, but a quick answer would be ohms is the resistance so the lower the resistance the more power is sent to the coil for more production and vapor and such....also means the more the batt has to work (amps) so the better the batt the more you can work it which gives more production. Ohms is simply resistance.

 

[Cool_Breeze]

A 0.5 Ohm coil will, for a given voltage run a lot more energy through it than a 2.5 Ohm. The lower the resistance (Ohms) for a given voltage, the higher the current (Amperage).

 

[Cool_Breeze]

http://i.imgur.com/2N7tyib.png

 

[Bunnykiller]

ohms are the unit of measure of resistance... the lower the ohms the less the resistance of the flow of electrons thru the conductor.... when the resistance is higher, it requires more voltage to push the electrons thru the wire... its all a balancing act.. low voltage at a low resistance is equal to a high resistance at a hi voltage.... example:

2/2 =1 156/156=1
you need to find unity

 

[r77r7r]

...............

 

[HecticEnergy]

I think iStick has a 1ohm limit, so be sure and check the spec sheet before pulling the trigger if you plan on running that low.
Play with an ohms law calculator a bit like the one on Steam-Engine.org, you'll get the idea.
Amps is like pressure, watts is a measurement of power, volts is potential for 1 watt @ 1amp. Ohms works its way in there too - lower ohms require higher amps to meet the same wattage for a higher ohm resistance.
There's a bunch of youtube videos on the topic, if the above doesn't make sense, check that out.
Lower ohms heat quicker, but drains the battery faster at the same wattage. personally I'd go with a nautilus or kanger aero tank before jumping into the sub ohm tanks, but I'm more in it for flavor than clouds. If I got a sub ohm tank I'd get the Delta II from Joyetech - supposedly it knocks the others out of the game.

 

[bloodyrune]

I suggest reading up Ohm's law to get in depth info about it, then you can use ohm's law calcutators when making coils.

But for an old simple way to explain resistance (ohm) is to imagine the wire as a water pipe, voltage will be the water pressure, current is the amount of water flowing through the pipe and the resistance will be the size of the pipe. This way you can imagine the situations in your head, like; bigger pipe will have less resistance and more pressure will cause more water to flow through the pipe, meaning more current. etc.

 

[Susan~S]

Here's a beginner video for you: eCig 101: Ohms & Resistance - What does it mean?

The below blog posts are from Baditude.

1. Ohm's Law for Dummies (Vapers)
* My attempt at explaining Ohm's Law in layman terms and how it relates to vaping.

2. Explain it to the Dumb Noob: Ohm's Law Calculations
* As simple as it is to use, some people have a tough time grasping the concept. Warning: Includes graphic photos of mod explosions.

 

[mcerk02]

ohms is the resistance of the wire the coil is made of, 2.5 ohm will need much less wattage to fire it then a 0.5 ohm coil, which is sub-ohm, just about any mod will fire the nautilus, if you get the atlantis, make sure you get a mod that can fire sub-ohm

 

[Bunnykiller]

ohms is the resistance of the wire the coil is made of, 2.5 ohm will need much less wattage to fire it then a 0.5 ohm coil, which is sub-ohm, just about any mod will fire the nautilus, if you get the atlantis, make sure you get a mod that can fire sub-ohm

ummm backwards... a 2.5 ohm coil needs more power to equal a .5 ohm coil to bring it up to the same wattage...

example: a 100 watt lite bulb gives off the same light at half power as a 50 watt lite bulb at 100% power

 

[HecticEnergy]

ummm backwards... a 2.5 ohm coil needs more power to equal a .5 ohm coil to bring it up to the same wattage...

example: a 100 watt lite bulb gives off the same light at half power as a 50 watt lite bulb at 100% power

power = wattage, so its the same amount of "power". Amperage is another story, it takes more force to get through a .5 ohm coil than a 2.5ohm coil, so your battery losses its charge more quickly.

 

[Marc411]

This gentlemen has a great blog that features information on batteries and ohms law.

It's worth going through his blog when you finish this one:

http://www.e-cigarette-forum.com/fo...-explain-dumb-noob-ohms-law-calculations.html

 

[TheJester]

This is my favorite analogy for what voltage, current(amps), resistance (ohms), and power is. It won't give you the crazy theoretical definitions but it should help give a bit of intuition. It's a weird flash animation and you have to press the play button and read it all but it was the best visual thing I could find. All of the youtube videos stunk.

HYDRAULIC ANALOGY | Interactive Free flash animation to understand the difference between voltage and current. Simulation | Physics and Chemistry by a Clear Learning in High School, Middle School, Upper School, Secondary School and Academy. PCCL | je

edit - the animation doesn't cover resistance for some reason. Resistance is essentially when the flow of electrons is impeded. So if you put you're thumb over a water-hose you will create an impedance in the flow(current) of water and it will spray out everywere. With electricity, a resistor is a material which is conducting electrons but impedes the flow. Instead of spraying water or electrons everywere, it will release heat. In the case of an electronic cigarette, essentially, they are a single resistor made out of a coil. The heating phenomenon is typically referred too as "Joule Heating".

edit #2 - if you increase the size(diameter) of a drain pipe water will flow more easily. Decrease the size and it will flow with more pressure and probably turbulance. The same applies to wires. Electricity can flow more easily through big diameter wires verses skinny ones. Which is why wire gauge(thickness) matters when building coils.

Of course there are more rigid definitions from physicists years back but for a basic understanding this should be a good launching point.

 

[Rat2chat2]

This thread may also help.

http://www.e-cigarette-forum.com/forum/new-members-forum/366112-ohms-law-explained-layman-terms.html

Good luck to you.

 

[Bunnykiller]

power = wattage, so its the same amount of "power". Amperage is another story, it takes more force to get through a .5 ohm coil than a 2.5ohm coil, so your battery losses its charge more quickly.

so if it takes more force to get thru a .5 ohm coil than to go thru a 2.5 ohm coil then what you are saying is a . 5 ohm coil has more resistance than a 2.5 ohm coil....

 

[drunkenbatman]

From the pain in this thread the answer appears to be that explaining ohms and why you'd care is hard, but people gave links so I'll just focus on why you'd care. You should go through them, and know that if you have a VV (variable voltage, eg you can dial it up or down) you'll generally want 2.0-2.5ohm, because they give you more headroom (and other stuff, but for you it's headroom).

If you have a 1.5 ohm coil and a 2 ohm coil in a protank 2, and have your voltage set to 3.7V the 1.5 ohm coil will get hotter quicker. However it might get hot so quick that your eliquid tastes burnt due to the wicking, and sometimes with fruity eliquids a lower voltage helps bring out the flavor.

However even at 3.3V, the 1.5ohm might get hot quickly enough that it isn't helping, whereas a 2 ohm coil, because it takes more energy to heat up, will give you the flavor you want. And, if you decide you want it to act/taste more like a 1.5ohm coil, you can simply up the wattage on the device.

 

[AttyPops]

It's like your kitchen faucet.

If you only open it a little bit...there's lots of resistance to water flow, so you get a little stream of water. If you open it all the way, the faucet has almost no resistance to flow and you get max water flow from your plumbing system.

Resistance (ohms) are like that...the more resistance to flow, the higher the number. The higher the resistance, the fewer electrons flow for a given voltage...aka cooler coil.

So 0 ohms is "fully open" ....zero resistance....also known as a "dead short". Always bad for e-cigs.

A few other definitions in this analogy:
Voltage/Volts: The water pressure. How hard it "pushes through" the plumbing/wire.
Amps: The number of water molecules/electrons flowing past any given cross section of pipe/wire per second
Watts: The amount of work you can perform with the above. #molecules of water per second (amps) X their pressure/momentum (volts) = total work (watts).

Watts are kind of a "result" of the other stuff. If you have amps but no volts, you have a lot of electrons sitting around not moving...zero work. If you have a lot of volts but no amps...you have a lot of electrons that want to move but can't. Zero work. But together...some quantity of electrons moving at a given speed = we can do something with that.

This "work" concept is why your electric bill is in kWh...kilo-watt hours...1000 watt hours. So that little Roku you have sitting in your entertainment center uses 2 watts per hour (let's say) and is responsible for a 0.002 kWh drain on your electric bill for every hour it is plugged in.

 

[DaveP]

When you connect a wire between a voltage source and ground (like a coil) and turn on the power source to it, electron flow occurs and the electrons go through the wire at a rate proportional to the voltage (push). If the resistance is low (a 1 ohm coil), then current flows faster and more heat is generated across the wire for a given voltage. For a 3 ohm coil that same voltage will cause electrons to flow more slowly, generating less heat, and you have to up the voltage to increase electron flow in the wire and increase the heat.

Voltage is analogous to pressure and wattage is analogous to current flow across a given resistance. Using the formula E^2/R you can calculate the wattage for a given voltage across a given resistance.

3.7v x 3.7v / 1 ohm = 13.69 watts

3.7v x 3.7v / 3 ohm = 4.56 watts

 

[tchavei]

And the heat comes from electrons rubbing against each other and the walls of the conductor which is kinda pornographic if you think about it lol

Regards
Tony

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