Wrapping my mind around ohms

[JoeM86]

I'm trying to figure out ohm's, I keep thinking I understand then read something else that confuses me. For example, the higher the number for the ohm rating, is that higher resistance, or higher energy flow so lower resistance?

Just for simple numbers sake, say you have a 1 ohm carto, and a 5 ohm carto. Which statement (if any) is true?..
(and a couple of these statements make absolutely no sense to me, so dont mock me lol. just trying to figure it out plane and simple)

1. 1 ohm carto is lower resistance than 5 ohm carto, so 1 ohm carto doesnt burn as hot, and will not drain battery as fast.

2. 1 ohm carto is lower resistance than 5 ohm carto, so 1 ohm carto doesnt burn as hot, but will drain battery faster.

3. 5 ohm carto is lower resistance than 1 ohm carto, so 5 ohm carto doesnt burn as hot, and will not drain battery as fast.

4. 5 ohm carto is lower resistance than 1 ohm carto, so 5 ohm carto doesnt burn as hot, but will drain battery faster.

OR does lower resistance burn hotter??? ugh

 

[NGIB]

The lower the resistance the lower the voltage required to generate "X" number of watts. The ohm is the measure of resistance like inches is the measure of length. Lower ohms means lower resistance.

A 1.7 ohm carto at 3.7 volts makes 8.05 watts. It takes about 4.4 volts to get the same results from a 2.4 ohm, and about 4.75 volts with a 2.8 ohm.

More resistance requires more voltage to accomplish the same amount of "work". I think it was Sailorman that talked about this in layman's terms and said that about 8 watts is a "good" vaping result. So to achieve the 8 watts on a low voltage PV you need to use a low resistance device...

 

[tj99959]

This will help
Ohm's Law Calculator

At a given voltage the lower the resistance (ohms) the hotter the vape, but it take more amperage so shorter battery life.

 

[Hoosier]

5. 1 Ohm carto is lower resistance than 5 Ohm carto, so 1 Ohm burns hotter and will drain the battery faster.

Resistance, Ohm, is resistance. It impedes the flow, current, of electricity. If you resist water flow, you get less water and the same goes for electricity. Think of it as a flow of electrons instead of H2O.

V=IR Voltage is the product of amps and resistance. (This can be rewritten as R=I/V or I=V/R)
P=VI Power is the product of voltage and amps current. (Now let's sub the I with I=V/R)

P = (V*V)/R So your power, in Watts, is equal to voltage squared divided by resistance. Since resistance is at the bottom of the fraction, as it gets smaller P gets larger. Try it 4*4/5 = 3.2 Watts, now 4*4/1 = 16 Watts. See how much power is consumed from 5 to 1 Ohm at 4 volts? (Numbers are randomly choosen for demonstration purposes only.)

Power=Watts=Heat=Work

 

[jch419]

My brain suddenly hurts, jk. This is like one of those math questions back in Junior High that is like train "A" starts in San Francisco and is going 80mph while train B is in New York going 60 mph, @ what point do they derail!? Iiiiiii

LOL! Ok but seriously:

Higher ohms are good with VV's because they, as you put it, can handle more power aka have higher resistance. Lower ohms such as 1.5 for example, work with most all mods...it's the VV you have to be sure to match 3.0ohms with those.

The higher the ohms, the more capability it has in handling power.

Most all devices are good to go with 1.5's-it's a personal preference really.


Hope I could help.

 

[BGabe]

Here's a vaping chart that might help you. I'm assuming you're not into higer voltage vaping, so let's say your voltage will be in the 3.75v to 4.25v range.

Vaping Power Chart

 

[Mroutlaw]

My brain suddenly hurts, jk. This is like one of those math questions back in Junior High that is like train "A" starts in San Francisco and is going 80mph while train B is in New York going 60 mph, @ what point do they derail!? Iiiiiii

LOL! Ok but seriously:

Higher ohms are good with VV's because they, as you put it, can handle more power aka have higher resistance. Lower ohms such as 1.5 for example, work with most all mods...it's the VV you have to be sure to match 3.0ohms with those.

The higher the ohms, the more capability it has in handling power.

Most all devices are good to go with 1.5's-it's a personal preference really.


Hope I could help.

This is not entirely true. The smaller the battery, the higher the Ohm's you want on the Carto. Small batteries cannot handle low resistance Cartos, it will fry them because it will use them up too quick.

The lower the ohms, the less resistance the carto has. Let's put it another way. When you vape you use watts to make the vapor. Higher watts used create more vapor, and hotter vapor but uses more battery power. Think about it this way. If you put a pot of water on the stove to boil, the more heat you add, the hotter the water but you will use more electric. Now think of the pot itself as the resistance. A thinner pot will heat up faster than a cast iron one. So, the thin pot is a lr carto and the cast iron is a high resistance one.
Now let's figure out watts used.

Take the voltage of your battery (we'll say 3.7) and multiply it by itself. Then divide by the resistance of the carto.(let's say 2.8). So 3.7x3.7= 13.69 then divide by 2.8= 4.89 watts used. Now, if you use a 1.7ohm carto you will use 8.05 watts. A variable voltage pv allows you to change the volts up and down, in this instance, you would lower the volts. You battery can only give (x) amount of watts before it dies, so the more watts you use, the faster the battery dies.

Now, if you take the voltage of your battery and divide by the resistance of the carto to get (x) then divide the milliamperes the battery has by that number. Then multiply that number by 60 and you will get how long the battery will fire the atty in minutes. For example
3.7(volts of battery) / 2.8( resistance of carto) = 1.32. Then take a 380mah battery. .380/1.32= .29. Now .29x60=. 17.4. Now take .4 and multiply by 60 for the seconds you get 24. So, a 380mah battery at 3.7volt will fire a 2.8ohm carto for 17minutes and 24seconds

This concludes the science lesson for the day

 

[WCSR]

5. 1 Ohm carto is lower resistance than 5 Ohm carto, so 1 Ohm burns hotter and will drain the battery faster.

Resistance, Ohm, is resistance. It impedes the flow, current, of electricity. If you resist water flow, you get less water and the same goes for electricity. Think of it as a flow of electrons instead of H2O.

V=IR Voltage is the product of amps and resistance. (This can be rewritten as R=I/V or I=V/R)
P=VI Power is the product of voltage and amps current. (Now let's sub the I with I=V/R)

P = (V*V)/R So your power, in Watts, is equal to voltage squared divided by resistance. Since resistance is at the bottom of the fraction, as it gets smaller P gets larger. Try it 4*4/5 = 3.2 Watts, now 4*4/1 = 16 Watts. See how much power is consumed from 5 to 1 Ohm at 4 volts? (Numbers are randomly choosen for demonstration purposes only.)

Power=Watts=Heat=Work

This...

I often use water to explain the theories of electricity to people I teach. Water and electrons are very similar in the way they flow, and the way we can manipulate both of them in much the same way using certain items. A water source such as a spigot or a fire hydrant replicates a power-outlet/alternator/generator, a spray nozzle replicates a resistor, a check-valve replicates a diode, kinking and un-kinking the hose in a certain fashion and timed manner can replicate pulse-width-modulation or cycle/frequency, an elevated gravity-feed water tank replicates a battery, etc... Using the visual aid of water that a person can see, makes it much easier to express the theories of the electricity that people can't see.

There's a balance between current "flow" and voltage "pressure" to accomplish a certain job, in regards to rate of depletion of the source, what is needed, and what can be handled by the recipient. You wouldn't fight a building fire with a garden hose w/ a nozzle, you wouldn't wash your vehicle with a pump-bottle garden sprayer (bug sprayer), and you wouldn't water your prize winning petunias with a fire hose.


With that said... You explained it much easier than I could have. I have a tendency to explain it too in-depth.

 

[Mroutlaw]

This...

I often use water to explain the theories of electricity to people I teach. Water and electrons are very similar in the way they flow, and the way we can manipulate both of them in much the same way using certain items. A water source such as a spigot or a fire hydrant replicates a power-outlet/alternator/generator, a spray nozzle replicates a resistor, a check-valve replicates a diode, kinking and un-kinking the hose in a certain fashion and timed manner can replicate pulse-width-modulation or cycle/frequency, an elevated gravity-feed water tank replicates a battery, etc... Using the visual aid of water that a person can see, makes it much easier to express the theories of the electricity that people can't see.

There's a balance between current "flow" and voltage "pressure" to accomplish a certain job, in regards to rate of depletion of the source, what is needed, and what can be handled by the recipient. You wouldn't fight a building fire with a garden hose w/ a nozzle, you wouldn't wash your vehicle with a pump-bottle garden sprayer (bug sprayer), and you wouldn't water your prize winning petunias with a fire hose.


With that said... You explained it much easier than I could have. I have a tendency to explain it too in-depth.

Thank you, I appreciate the compliment

 

[JoeM86]

Awesome. In fact too awesome lol. Im sleepy so Ill be referring back to this later on but got my basic understanding down now. Thanks a bunch!

 

[klstreet]

Ohm's Law - The basics - Ohms Law Formulas Explained

pretty straight forward explination and easy to understand