Voltage drop.. Can somebody summarize it for me?

[Dusty_D]

Got me one of those inline voltage meters. Voltage at the atty connector without load is 4.09. Once I screw on a dual-coil carto the voltage under load drops to 3.8.

What causes this drop exactly? Can somebody summarize it for me?

I have some idea of what causes it, but would like a more solid idea as to the cause.

Anybody? Switched?!

 

[Ms. Creant]

Simple answer: resistance.

Any circuit is going to have a certain amount of resistance, some more, some less. if you take the same regulated power supply and hook up a 5" piece of wire to each post the resistance will be very low and the wire will get hot. If you take a 50' peice of wire the same guage and do the same thing the resistance will be very great as will the voltage drop and the wire may only get slightly warm.

Have you tried it with different resistance attys?

 

[zoiDman]

Simple answer: resistance.

Any circuit is going to have a certain amount of resistance, some more, some less. if you take the same regulated power supply and hook up a 5" piece of wire to each post the resistance will be very low and the wire will get hot. If you take a 50' peice of wire the same guage and do the same thing the resistance will be very great as will the voltage drop and the wire may only get slightly warm.

...

I very Nice & Simple Explanation.

Another way to think about is if there was No Voltage Drop it would Imply that there was No Resistance in the Atomizer Wire. And if there was No Resistance in the Wire, No Heat would Be Created. It’s that Darn Conservation of Energy Thing.

Most people see Voltage Drops as a Bad thing. And many times it is. But to Vaper’s, it’s actually a Good Thing.

 

[zoiDman]

BTW - In a "Perfect" Atty/Carto on a PV or VVPV, ALL the Voltage Drop would be due to the Resistance of the Atomizer Wire Only.

 

[Dusty_D]

I'm not getting any difference in voltages at the atty connector, so I think I'm good there. I did notice that the resistance drop was more with a battery that had been used to a while. So, battery that shows 3.8 volts, drops to 3.3 under load vs a fully charged battery.

Good responses so far. Thanks!


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[zoiDman]

Just curious.

What type of PV are you using.

The reason I ask is I believe that some PV's have Circuitry that senses Voltage Drop and makes adjustments for it. But I could be mistaken.

 

[Dusty_D]

Just curious.

What type of PV are you using.

The reason I ask is I believe that some PV's have Circuitry that senses Voltage Drop and makes adjustments for it. But I could be mistaken.

All my hardware is in my signature. Currently only tested on the Omega. Fully mechanical, no circuitry..

 

[zoiDman]

All my hardware is in my signature. Currently only tested on the Omega. Fully mechanical, no circuitry..

The VERY first thing I do when I join a Forum is to find the setting in My Profile to Turn Off Banners and Signatures.

That's why I didn't see your Hardware.

 

[Dusty_D]

Fine then, be that way.. I'm going to be testing it on the Omega, Silver Bullet and Reo Grand. I bought it just to make sure I'm getting consistent voltages across my mods.


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[Switched]

Just to add, as the resistance in attys drop so will the drop of voltage

 

[Dusty_D]

So, is there an acceptable rule of thumb with regards to drop? E.g: 1.5 on 3.7v will drop .4v. Just so we know we're getting the best bang for our hardware?!


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[Ms. Creant]

I'm not getting any difference in voltages at the atty connector, so I think I'm good there. I did notice that the resistance drop was more with a battery that had been used to a while. So, battery that shows 3.8 volts, drops to 3.3 under load vs a fully charged battery.

Good responses so far. Thanks!


Sent from my iPhone using Tapatalk

I believe the internal resistance of the battery itself changes a bit as it becomes more drained, that would probably explain the increased drop on a battery that is less charged. It basically has to work harder (more load).

 

[Switched]

I believe the internal resistance of the battery itself changes a bit as it becomes more drained, that would probably explain the increased drop on a battery that is less charged. It basically has to work harder (more load).

That would be corerct and the problem is further exacerbated as the battery gets older due to the internal resistance increasing because of an increase in rock content (ions no longer capable of accepting a charge, but rather wasting space in the battery. It's akin to driving in traffic.

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