Dual coil and amps

[mrmack00]

I'm considering trying My first dual coil build. How would I figure my amps? Just multiply by two (assuming they are the same resistance)?

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[suspectK]

A proper dual coil will be two coils of the same resistance. The equivalent resistance(measurement of entire circuit) will be half the resistance. You can just multiply by two, but always measure your builds..

 

[bender817]

http://www.google.com/url?sa=t&rct=...=mcFYogGhd788nFerVBp3WA&bvm=bv.59568121,d.eW0

 

[dripdaze]

Measure your build after both coils are connected and you will have the proper answer.

 

[mrmack00]

Just to clarify, if I make two .7 ohm cartos, running at 3.7 volts, that would be 10.57 amps (5.28571 amps X 2).

 

[st0nedpenguin]

Always calculate based on theoretical fresh battery voltage of 4.2v, it's much safer.

 

[suspectK]

Correct math, but like penguin said, you're basing your current needs off a fresh battery..

4.2÷0.35=12

 

[bender817]

Just to clarify, if I make two .7 ohm cartos, running at 3.7 volts, that would be 10.57 amps (5.28571 amps X 2).

What do you mean 2 cartos? I'm curious and a little afraid. lol. Two .7 ohm coils run in parallel would be .35 ohms. (4.2v, 12a, 0.35ohms, 50.4w) and the watts would be divide to each coil getting 25.2w

 

[mrmack00]

Oops, I meant coils... And good point on the 4.2 fresh battery, forgot about that

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[EDO]

I always use 4.0 volts to calculate things...since you are going to have a minimum of 0.2 voltage drop with dual coil builds.

 

[UncleChuck]

The easier way to do it, IMHO, is to simply consider the total resistance of the build. If you have a pair of 1ohm coils, the total resistance of the build is .5 ohms, so just use .5 ohms as your resistance value when calculating amps (or whatever the total build rez is)

The battery doesn't care how many coils you have, the only thing that matters is the overall resistance of the build. A dualcoil build with an overall resistance of .5 ohm will draw the same amps as a single coil build at .5 ohm.

 

[mrmack00]

So if I built and connected two 1ohm coils, and put it on an ohm reader it will actually read as. 5 ohms?

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[bender817]

So if I built and connected two 1ohm coils, and put it on an ohm reader it will actually read as. 5 ohms?

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Yes sir. If you did the same with a quad coil it would be .25 ohms. Assuming the coils are identical, the resistance of one will be divided by the number of coils in parallel.

 

[mrmack00]

What happens if they are. 1 or. 2 off? Does that cause major problems?

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[bender817]

Not dangerous problems. They just wont heat evenly. If you do the same amount of wraps on each one you should be able to get them heating evenly by poking, prodding, pulsing, and pinching.