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Post by VapingBad on Jul 12, 2017 20:45:44 GMT
VapingBad I still maintain that for a pure resistive load, Watts are dependant on the amps no matter what magic box you have between the battery and the coil. I agree that some strange things happen within the box, but surley if you increase the ohms, the load on the battery is reduced for the same wattage? Jim There is not a single R in the circuit, the converter and plenty of other passive components (resistors, capacitors and inductors) are now involved in the circuit so it is a far more complex set of equations than I = V/R. Current is different each side of the converter like your crank-shaft and wheels turn at different rates, with different HP and torque because the energy goes through a gear box. Look at any of the DNA board specs and note the max input and output currents are quite different, EG DNA 20 = 7 A & 6 A, DNA 40 = 16 A & 23 A, DNA 200 = 23 A & 65 A respectively, go to www.evolvapor.com and download the spec sheets to confirm.
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Post by VapingBad on Jul 12, 2017 19:14:11 GMT
Thanks for the kind words, but don't be hard on jevans as there are a lot of people convinced of the same thing and he was just brave enough to stick up for his understanding of it. It is the vape celebs that repeat this misinfo that should be blamed if anyone, we are not born understanding electronics, ignorance is the natural state of affairs and if people you trust tell you the wrong thing it is nothing to be ashamed of if you believe it.
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Post by VapingBad on Jul 12, 2017 5:45:03 GMT
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Post by VapingBad on Jul 12, 2017 5:23:03 GMT
But the battery cannot see that passive load it has a black box active electronic circuit between them jevans If you have a 1 ohm coil, 80% effiency and 4 V battery at 10 W and a 0.5 ohm coil at the same levels they would both draw 3.125 A as they are using 12.5 W from a 4 V battery. If they drew different currents the wattages would be different, you would have created or destroyed energy breaking the First Law of Thermodynamics, one of the fundamental Laws of Nature. You are confusing this the situation on the coil side where at 10 W the 1 ohm coil would need 10 V and draw 1 A and the 0.5 ohm would need 5 V at 2 A. Look at a wall-walt power supply and note the DC ampage and the Mains AC ampages are different.
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Post by VapingBad on Jul 11, 2017 20:45:00 GMT
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Post by VapingBad on Jul 11, 2017 20:43:52 GMT
Wow really set the fox loose in the hen house PEACE brothers!!! I only wanted a saboteur ohm coil not a war Don't worry about it I will point out this stuff as it impacts on safety and using the wrong maths is far worse than not using any, so fell I have no option. Don't worry about the ohms over much just be between the min and max your mod supports.
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Post by VapingBad on Jul 11, 2017 20:40:30 GMT
This is interesting If a DNA mod was plugged into escribe and fired, wouldn't this show who to be correct? 🤔 No, but I wouldn't have got my Bachelors of Engineering in Electronics & Management if I was wrong about such basic concepts, sadly this a widely held belief that Jim is talking about far too many youtube and self appointed vaping experts repeat it all the time It's not surprising lot's people for getting mislead. Like this stupid sub-ohm phrase it is really not making vapers lives easier and those who have a platform should not keep spreading this sort of rubbish.
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Post by VapingBad on Jul 11, 2017 20:31:30 GMT
No, the battery in not directly connected to the coil it has an active circuit between them, think in Watts on both sides of the board, you would work out the battery current by power * (100 / efficiency) / battery voltage so say at 50 W with 80% efficiency converter 50 * 100/80 / battery voltage = 62.5 / battery voltage so with a low battery 3 V current would be 20.8 A with a fullish battery 4 V current would be 15.6 A You cannot re-write Ohms law! The only way your theory can be true is if the Watts display is telling porkies! WATTS = I 2R and will always do so! WATTS = IV " WATTS = V 2/R " That's not even in Ohm's law, it's from Joule Heating of a resistive load. You do not have a passive resistive load attached to a battery, you have an active voltage converter between the battery and the coil so you are not applying Ohm's correctly because there a lot more in the circuit than a simple resistive load. You would be breaking the First Law of Thermodynamics by creating or destroying energy, it can only be converted in this universe. Google boost or buck voltage converters if you want detail.
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Post by VapingBad on Jul 11, 2017 18:49:43 GMT
And there's the misconception right there that VapingBad speaks of. In a mech mod the power is determined by the resistance (and the battery voltage) , in a regulated mod the power is determined by the setting you request and the electronics adjust the voltage to deliver the power you've set. so 70 watts is 70 watts regardless of what resistance you use on a regulated mod, ignoring the electronics efficiency losses of course. Not so Greg! No matter what the power source...W=I 2R Which means that if you change "R" you also have to change "I" to maintain the same set Wattage! ETAMod set at 20W with 1.2 Ohm coil = 4.1 Amps " " " " with 0.5 Ohm coil = 6.3 Amps No, the battery in not directly connected to the coil it has an active circuit between them, think in Watts on both sides of the board, you would work out the battery current by power * (100 / efficiency) / battery voltage so say at 50 W with 80% efficiency converter 50 * 100/80 / battery voltage = 62.5 / battery voltage so with a low battery 3 V current would be 20.8 A with a fullish battery 4 V current would be 15.6 A
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Post by VapingBad on Jul 10, 2017 21:39:51 GMT
Make (almost) no difference unless you are on a fixed voltage or mech mod, this whole sub-ohm thing is just irrelevant to today's vapers. Sub ohm is a completely stupid term that should be ruthlessly taken the pish out of IMO unless you have a mech or fixed voltage device where ohms set the power. It made sense for a very short time a few years ago, then got high-jacked as a nonsense marketing term that stuck and causes untold confusion to this day, high/low power make far more sense and are universally applicable. Though sub ohm coils tend to be bigger, but it's the bigger bit that requires/handles more power not the ohms on most mods, then step forward to recent years and different materials and multiple coils (not to mention airflow and wicking) and you can not do like for like with ohms, well you never could really in any absolutely sense, different gauges etc. Whoever went into to the shop and wanted a sub ohm (particular res) toaster, kettle electric bar fire, nonsense, complete and utter bollos that hangs around like... (I could go too far with this metaphor, so will abstain). BTW it makes little difference to battery current requirements unless you have an unregulated/mech mod, another heinous vapersphere crime against conmen sense that soo many proudly spread. Not against you at all bobby00 , a load of folks are thinking/asking the same, but this rubbish doesn't seem to know it's own sell by date (people repeating what they don't understand as if they did because some twatt they respect just keep repeating it)
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Post by VapingBad on Jul 10, 2017 21:04:38 GMT
IMO if you know the res and the mod doesn't set it and lock it if that is the only way to get a decent vape, life's too short and it is just a stack em high sell em cheap mod, all be it a well specified one that people say works great most of the time.
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Post by VapingBad on Jul 10, 2017 20:41:59 GMT
thebishman not equal to keeping up with... this thread for one thing (no raspberry smiley )
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Post by VapingBad on Jul 10, 2017 5:32:48 GMT
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Post by VapingBad on Jul 9, 2017 1:37:22 GMT
Well done jevans 1000 days not chuffin or puffin the dangerous stuff
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Post by VapingBad on Jul 9, 2017 0:55:41 GMT
Result, shared a cab with a couple and a spare guy, could have only cost 10p, but gave the same as the others to the driver (was the last drop off and the others had covered the fare) and way cheaper than Uber £27-£37 plus wait 10 mins for 5.1 miles. (the couple had fallen victim to the same rail shenanigans as I did)
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