Do ohms matter?

[Bunnykiller]

Since you have a Vamo, and a dripper, practice with that first, read about the batteries, learn the differences in wire gauges, and understand Ohms Law. Get the right battery(s) before you start doing mechs in low ohm setups. Oh and by the way Huge clouds = lots of juice used up.

 

[Randy C]

I spent 2 months researching rba's, electrical terminology/theory, and watching tutorials from folks who knew what they were doing with rebuildables. I did this BEFORE I even tried to wrap my first coil. There is lots to learn, so please be safe and heed the warnings from everyone in here.

And... I don't care what your battery is rated for.... do not go below 1-1.2 ohms.

 

[X-Puppy]

Like Randy C, I spent a lot of time researching before wrapping my first coil and already had a background in electronics.

I would like to 2nd Mama Tried's suggestion to read up on what Battitude has to say about batteries. I spent many hours scouring the site before running into his threads and its some of the best info you can get.

Happy vaping.

 

[suspectK]

Only buy batteries from a trusted source, and only buy reputable companies. And I'll have a triple order on reading baditude's blogs.

 

[kenflawless89]

Ok so after a sleepless night,I think I figured it out.. after reading battitudes thread it had me worried about my battery blowing up or something. So after starting at the ohms law graph and help from the electrician at work, I read my ohms on my addy and looked up the spec's on my battery. I m running a 1.0 ohm duel coil. With a 3.7 volt battery. The max amps for my battery is 5.2. So I took my ohms and divided it by my watts and got 3.7 amps.. PLEASE CORRECT ME IF I'M WRONG. Lol. But from what I've read my battery should be pretty safe.

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[patrao_n]

That 3.7 volt battery charges to 4.2. While it's unlikely you will ever fire a coil with 4.2 volts(it will drop under load) you should base your calculation on that number instead. Brings you in at 4.2 amps. I see you are using an HTC one. There is a couple apps that would be of use to you on the play store. Ohms law calculator and vapers toolbox. Go download them.

Sent from my SM-N900T

 

[dripdaze]

Being new to building, You should check out this tool built by one of the members here. It will give you a good idea of the kind of coil you need for a needed resistance. http://www.e-cigarette-forum.com/fo...159-kanthal-coil-calculator.html#post11665753

 

[suspectK]

Ok so after a sleepless night,I think I figured it out.. after reading battitudes thread it had me worried about my battery blowing up or something. So after starting at the ohms law graph and help from the electrician at work, I read my ohms on my addy and looked up the spec's on my battery. I m running a 1.0 ohm duel coil. With a 3.7 volt battery. The max amps for my battery is 5.2. So I took my ohms and divided it by my watts and got 3.7 amps.. PLEASE CORRECT ME IF I'M WRONG. Lol. But from what I've read my battery should be pretty safe.

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You don't ever calculate what current you'll need by 3.7volts from battery. It's recommended to use 4.2. Even though there's no such thing as a 100% efficient circuit, better safe than sorry.

And you get the square root of power÷resistance to find current. You ended up in the right place. You just left that part out of your text.. It's also easier to get your current with the values you'll already know with a mechanical, voltage (4.2)÷ resistance= current..so in this case 4.2(E)÷1(R)=4.2 (I)

 

[kenflawless89]

Ahh yeah . I have heard of them going to 4.2.. is that typically what everyone bases them as?. Thanks for the apps. I like how easy nd simple the ohms law calculator is... I'll havebto mess around with them a lil more.

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[kenflawless89]

Ahh.. I found it. It says Open Circuit (Charged) voltage:4.2v. Thanks for opening my eyes

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[Free6413]

Please read the info in the rebuilding subforum and watch a ton of videos on rebuilding before proceeding.

Ohms matter a great deal and not knowing what you're doing with respect to resistance and rebuildables can result in very, very bad things happening.

Just looking out for ya, buddy.

Couldn't have said it better myself. One thing to remember is that the closer you get to zero.....you are only that far away from a short! In this instance....shorts bad!

 

[kenflawless89]

Ahh.. the more research I do. I come back here and everything suddenly is making more and more sense.. sorta seems easy-ish.. but I did go back to the ohms law app and typed everything in and it came up with 2.04 amps?...

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[dvdgroover]

Ohms law is kind of a necessity for making your own coils

 

[patrao_n]

With ohms law app you input only 2 parts. You put voltage(4.2) and ohms(in your earlier example it's 1.0). It will then calculate the amps and watts for you. Then you check to make sure those amps are less than the rating of the battery.

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[kenflawless89]

Thanks for the replay.. very helpful, you made it seem sorta easy .. Ive been trying to find the my batterys lowest amp and the highest amp. But I cannot find it.. I'm pretty site the highest amp rating is 5.2 but I just wanna make sure.

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[kenflawless89]

Damn auto correct.

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[dice57]

With a mech mod knowing your battery is a must. The lower the ohms the higher the amps that are drawn from the battery. I use 30 amp continuous batteries for my mech builds. Something like the Sony 18650 VTC4 or the new Efest Purple 30 amp 18650 would be a great choice. I use the Sony's personally, and have ordered some of the Sony 50 amp 26650 for my new Big Nasty Mech mod that should be showing up in a week.

If you have to ask why, then you should go back and study and read all the threads on the inherent dangers of using a mech mod and battery care. You are the only safety device that is used in a Mechanical device. If you don't know what you are doing, then you may never get the chance to understand, because that first vape could be the last one you'll ever be able to take.

Not trying to scare you, but yes I am. People who are thinking of going Mech, should already know about batteries, ohms law, amp requirements, have the tools of the trade to check the ohms of the build and battery voltage, and their questions should be more like, hey, was looking at the Sony VTC4, the new Efest Purple 30 amp 18650, and the MNKE IMR 1500mah18650, which have you noticed that delivers that best power for the longest, and fades slowest. With a question like that, we'd at least know you did your home work and were asking the right questions.

I don't know everything there is to know about mechanicals, but I know enough which battery I am going to use when firing a .3 ohm build, and which one I wouldn't dare to try. All the information one needs to know is on this forum. http://www.e-cigarette-forum.com/fo...help-picking-best-battery-sub-ohm-vaping.html is just one of the threads concerning batteries. there are many more.

 

[patrao_n]

Just a heads up op. There is no lowest amp limit. Only highest. Your battery will run a .1 amp without question. I would look up the model number on the side of it. Then look for either a c rating or an amp rating.

Sent from my SM-N900T

 

[kenflawless89]

this is the battery I have.. but I think it might be good enough. But then again I have to build the coil to find out. What I'm going for is duel micro coils around 1 ohm maybe a lil lowerd or higher would be fine.

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[kenflawless89]

Oh . And my efest are supposed to arrive today also.. efest 18650 2000 mah.

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