Am I getting this right about V/W/Ohms/Amps?

[kc0716]

I am just trying to be careful here as I read some of the dangers of sub-ohm vaping.

I will be using this chart (from one of the stickies) http://i67.photobucket.com/albums/h295/Technonut/volts-to-ohms_zpsfc47f1f7.jpg

I have read that most mechanical mods will run @ 3.7v & 9w on the average.
(I am assuming this is correct)

For example...

Let's say I put 1.5ohms coil on a mechanical mod, and that I am using a battery that can be used up to 10 amps.

1.5ohms @ 3.7v is 9.13 watts and 2.47 amps. Since the mod can do 9 watts and battery can do 10 amps. This is safe.

Now, say I change the coil to 0.5ohms.

0.5ohms @ 3.7v is 27.38 watts and 7.40 amps. The mod can only do 9 watts but my battery can still easily do 7.40 amps. Is this safe?

According to the chart in the link...anything sub-ohm has at least 13+ watts but how do people use sub-ohm coils when the mechanical mod can only do about 9 watts?

I think I am missing something here...

 

[Baditude]

You should be more concerned about the amp limits of your battery. When doing sub-ohm builds, you must know the amp limits of the battery and not exceed that limit.

Ohm's Law Calculator

When calculating the amp draw of a coil, we always use 4.2 volts, the voltage of a fully charged battery. A 0.5 ohm coil will pull 8.4 amps (current) from the battery.

Drop the resistance down just 0.1 ohm to 0.4 and the amp draw will be 10.5 amps. 0.3 will pull 14 amps.

One should always use a wide margin of safety and not approach a battery's continuous amp limit. Most people recommend using only 80% of a batteries amp capacity. If a battery is used repeatedly under hard conditions, and as it ages over time, a battery will lose the former specifications it once had when it was brand new.

Amp ratings of IMR/hybrid batteries: Battery Basics for Mods

 

[KenD]

Mech mods don't have any limits on the watts they can be run at.

Sent from my GT-I9100 using Tapatalk

 

[StarsAndBars]

Sounds like you got it dude. Voltage/Resistance=Amps. I salute you for taking the time to be safe.

Which device are you using? Mechanicals typically don't care what is going on. They just hold the battery and complete the circuit. That's why care should be given to knowing the limits of your setup.

If you're using a device that has a chip, you will be at the mercy of that chip. If you're using a simple tube mech that holds your battery and has a fire switch, then you can go as crazy as you want to. Just make sure your battery can withstand the amp draw.

 

[PaulBHC]

Thanks for the links. I just started recoiling clearos. My first one is 1.4 and I worried about it and the second was 0.4 and I tossed it. Next couple were over 2 so I'm getting better. At least I know the 1.4 is safe on an AW 18350.