General question about "hot legs"

[xwarp]

Although it is probably very rudimentary compared to the knowledge of most people on this forum, one way I like to remember it is to compare electrical wire to plumbing pipes..........

From what I have seen, I'd say to the contrary.

Electrons don't flow through a conductor and meet in the middle to battle it out, so to speak, which in turn, creates heat.

There is this thing called "electron hole theory", and then, with the effect of Joules heating, which has an effect on inducing the "glow" people refer to, .......well.......that's a lesson for a week when people are bored enough to attempt a shot.

It's bad enough that people use the term "ohm" improperly, but I can live with that here, anyone in the business I'm in would not last a week as a tech without being ridiculed for it.

 

[Spazmelda]

Your only doubling the wire mass of the legs not the whole coil, expect a 0.2 ohm drop doing that. If you were doubling the wire for the whole coil then you would be cutting the resistance in half but you’re not doing this. You are only cutting the resistance of the legs not the coil.

Yes, sorry, I was sloppy with my language. I meant that I was under the impression that you'd be halving the resistance of the twisted portion of the wire, not the whole thing. The single wire coiled part would still have the same resistance (relative to length).

 

[Spazmelda]

From what I have seen, I'd say to the contrary.

Electrons don't flow through a conductor and meet in the middle to battle it out, so to speak, which in turn, creates heat.

There is this thing called "electron hole theory", and then, with the effect of Joules heating, which has an effect on inducing the "glow" people refer to, .......well.......that's a lesson for a week when people are bored enough to attempt a shot.

It's bad enough that people use the term "ohm" improperly, but I can live with that here, anyone in the business I'm in would not last a week as a tech without being ridiculed for it.

Sorry. I'm a molecular biologist. I can tell you all about dna and RNA and gene expression, but I do admit I am woefully ignorant about electrical circuits and energy "stuff". I'm trying to learn. I don't think I will ever attempt to be a tech, so hopefully I will only be ridiculed here and not out in the electronics world.

 

[xwarp]

Sorry. I'm a molecular biologist. I can tell you all about DNA and RNA and gene expression, but I do admit I am woefully ignorant about electrical circuits and energy "stuff". I'm trying to learn. I don't think I will ever attempt to be a tech, so hopefully I will only be ridiculed here and not out in the electronics world.

No, you would not be ridiculed by me because you are accepting of the correct info, where as, I've seen those that don't know what they are talking about get offended when correct info is offered.

Example: Replies using the word/s "ohmage" or, "what's your ohms". I've never been to a doctors office where I've been asked "What's your poundage?"

Although, I suppose these days, you can be an expert in anything if it's on youtube.......

 

[Spazmelda]

So, what is the correct way to use it? If I say, "my coil has a resistance of 2.2 ohms", would that be correct or incorrect?

What about, "what are (is?) the ohms of your coil"?

 

[xwarp]

So, what is the correct way to use it? If I say, "my coil has a resistance of 2.2 ohms", would that be correct or incorrect?

What about, "what are (is?) the ohms of your coil"?

Your first question is correct. Apply it as if you were talking syringe sizes, or weight as an example.

The second, not correct. Refer to first question.

 

[Spazmelda]

Ah, okay. So the second would be more correctly worded as, "what is the resistance of your coil" with the assumption the answer would be provided in the appropriate unit of measurement. I see the distinction you are making.

Like, if someone came to me and said, "my solution doesn't seem right". I might reply, "how many grams of buffer did you add?" But I wouldn't say, "what were the grams of your buffer?"

 

[xwarp]

Ah, okay. So the second would be more correctly worded as, "what is the resistance of your coil" with the assumption the answer would be provided in the appropriate unit of measurement. I see the distinction you are making.

Like, if someone came to me and said, "my solution doesn't seem right". I might reply, "how many grams of buffer did you add?" But I wouldn't say, "what were the grams of your buffer?"

I have no clue of the measurement units used inyour field, but yes, that last part doesn't sound right in any case.

On a side note, I have heard that "Alcohol IS a solution!" LOL

 

[Jerms]

Doubling up the wire at the legs and twisting them does work pretty well to avoid sexy legs for eVod heads. Like others said, it halves the resistance at the legs, so like using NR wire, most of the heat comes from the part of the wire we want it too.

I have a fairly simple explaination as to why it works, one that makes sense to me. That said, with my limited electrical knowledge I'm not sure how accurate the explaination is, so someone feel free to correct me if I'm wrong..

The amount of current passing through the wire is the same for the whole length. At the legs with the wires twisted the current is split between the two wires, so each wire gets half of the current compared to the one wire coil which gets the full current. Make sense? Accurate explaination?

Sent from my LGL55C using Tapatalk 2

 

[Spazmelda]

Sure, and that's how I understand it as well. Kind of the same as dual coils being half the resistance of single coils.

My original question has to do with untwisted legs though. The would have the same resistance as the coil in that case, but do not glow (or at least shouldn't).

 

[cowboy6591]

Fighting "hot-legs" on a genesis is only masking the problem.
Learn to properly oxidize.

You have a point but I don't like even "Warm" legs, anything under 700 degrees is not going to glow to the human eye but it is still hot. So I err on the side of pessimist caution and go for zero resistance on the legs in any case. Not masking anything here just making better even in a proper setup.

The reason I may pop for a K-Fun , their engineering is genius, they nearly eliminate the leg all together , I would call it a "Stub" not a leg, problem solved when the posts are nearly touching the coils.
I am trying to replicate that here and get rid of legs as well, use a non resistive substance right to the coil coming off of the wick. There's a reason why those K-Fun type units "Taste" so good.

 

[cowboy6591]

Sure, and that's how I understand it as well. Kind of the same as dual coils being half the resistance of single coils.

My original question has to do with untwisted legs though. The would have the same resistance as the coil in that case, but do not glow (or at least shouldn't).

The legs [not doubled over] will have the same resistance per inch. There are some theories that when a coil is red hot the resistance changes a tad but being sopping wet and not glowing in normal use that factor is irrelevant.

 

[xwarp]

The legs [not doubled over] will have the same resistance per inch. There are some theories that when a coil is red hot the resistance changes a tad but being sopping wet and not glowing in normal use that factor is irrelevant.

At the instant application of dc voltage to the coil, the above may be true, but in the case of NiCrA, it is not as seen by this chart that shows percentage of resistance increase vs. temperature.

Ex: a 2.0 coil at 68f will read about 3.3% higher at 600 degrees F.

 

[Randy C]

Your statement is absolutely INCORRECT.

You are totally CORRECT; I was absolutely INCORRECT.

 

[Randy C]

Thicker wire does, in fact, offer LOWER resistance.

Although it is probably very rudimentary compared to the knowledge of most people on this forum, one way I like to remember it is to compare electrical wire to plumbing pipes:

Larger pipes = lower resistance to the water flowing through them...same thing for electrical wire.


Smaller diameter pipes = higher resistance to the water flowing through them...again, same thing for electrical wire.

Not sure why, but it's easier for me to visualize water than it is for me to visualize electrons.

THIS is exactly right

 

[Spazmelda]

Thanks Randy. I feel less of the crazy now.

 

[cowboy6591]

No, you would not be ridiculed by me because you are accepting of the correct info, where as, I've seen those that don't know what they are talking about get offended when correct info is offered.

Example: Replies using the word/s "ohmage" or, "what's your ohms". I've never been to a doctors office where I've been asked "What's your poundage?"

Although, I suppose these days, you can be an expert in anything if it's on youtube.......

You don't seem to have a problem with wattage or voltage, they all came from the same tech slang.

 

[Randy C]

Thanks Randy. I feel less of the crazy now.

Ha Ha... I feel more crazy now. I was just thinkin... hang around here long enough and you'll eventually post something completely off the wall

 

[The Dingo]

From what I have seen, I'd say to the contrary.

Electrons don't flow through a conductor and meet in the middle to battle it out, so to speak, which in turn, creates heat.

There is this thing called "electron hole theory", and then, with the effect of Joules heating, which has an effect on inducing the "glow" people refer to, .......well.......that's a lesson for a week when people are bored enough to attempt a shot.

It's bad enough that people use the term "ohm" improperly, but I can live with that here, anyone in the business I'm in would not last a week as a tech without being ridiculed for it.

I must've missed something...You'd say *what* to the contrary?

I freely admit the "electrical wire to plumbing pipe" comparison is simplistic compared to others' knowledge, but if it helps just one person remember that thicker wire = lower resistance, I'm okay with it.

I don't recall referring to an electron battle in the middle of a conductor.

 

[Spazmelda]

I must've missed something...You'd say *what* to the contrary?

I freely admit the "electrical wire to plumbing pipe" comparison is simplistic compared to others' knowledge, but if it helps just one person remember that thicker wire = lower resistance, I'm okay with it.

I don't recall referring to an electron battle in the middle of a conductor.

He was referring to an earlier post. Not by you.