Potential

**warp1900** · 08-01-2009, 07:57 PM

Originally Posted by geeker

WTH is a wall wart?

A power supply that you plug into the wall socket, hehe

That is why they call it wall wart.

**warp1900** · 08-01-2009, 08:02 PM

Originally Posted by framitz

I went out immediately and got the only one my local RS had.

LOL

**framitz** · 08-01-2009, 08:08 PM

Originally Posted by warp1900

So, what do you guys do for a living is my next question (if i may ask), i am a music producer, i know a lot about plugging in instruments and audio equipment, I know how to match ohms on speakers and stuff like that, but never really messed with all this advanced electric/electronic information, so it's great to have some friends here knowing about this.
Having people in the forum from such different walks of life is what makes it great.

Thank you all

I'm an electronics technician since 1974, but worked the last 13 years in IT, most recently as a senior network security analyst - laid off 23 Dec, 08.

**kinabaloo** · 08-01-2009, 08:24 PM

A power supply rating that mentions current is the maximum it can comfortably supply before getting hot / losing voltage. So if an atty tries to draw 1.6A it should keep a voltage close to spec without dropping much.

Remember that current, in most cases, depends on the resistance and the voltage.
A power supply behaves much like a battery in this respect (having an 'internal resistance') such that the voltage will dip when current drawn is greater than the rated max. This is not a sudden effect, just where it becomes noticeable and the internal heating presents a worry.

**warp1900** · 08-01-2009, 08:50 PM

Originally Posted by framitz

I'm an electronics technician since 1974, but worked the last 13 years in IT, most recently as a senior network security analyst - laid off 23 Dec, 08.

So yeah, you sure know your stuff .
Not that i doubted it, i just was curious about the backgrounds of all you guys and gals.

Sorry about you being laid off framitz, lets hope for better times for all soon.

**NekoGurrl** · 08-02-2009, 04:49 AM

Originally Posted by Cisco

Hey Neko,

I am sorry but I have to disagree with you on the watts thingy. The wall pack has the ability to output 1600mA but that's not what the atty will take when vaping. Ohms law dictates this based on the voltage to the atty and the ohm rating of the atty. The pack is 4.5v and the atty has an ohm rating of 3.5, so 4.5 divided by 3.5 = 1.28amps. 1.28amps=5.76 watts. The key is there is no voltage drop which means there is no amp drop, the atty is getting its max power every time without any power loss.

I have the same wall pack in a 6v model, with the same 3.5ohm rating on the atty this pack will deliver 1.71 amps or 10.26watts, thats almost twice the wattage although only a small increase in amps/voltage.

Cisco...

You are right, the calculation I remembered was for potential. And since the 4.5 volt wall wart can deliver up to 1.6 amps it can easily handle the current draw of the atomizer.

But doesn't it also mean that if you have a 5v .5 amp source, with a 3.5 ohm resistance in the atomizer. 5/3.5 = 1.43 amps, which is above the specifications of the power source. Isn't this the situation that many people see on their PC's with a USB passthru.

It's been a long time since my electronics classes in tech school, and the last few years I've spent with my nose in systems, software and database management. Guess I'm a bit rusty

.

**kinabaloo** · 08-02-2009, 05:05 AM

Originally Posted by NekoGurrl

You are right, the calculation I remembered was for potential. And since the 4.5 volt wall wart can deliver up to 1.6 amps it can easily handle the current draw of the atomizer.

But doesn't it also mean that if you have a 5v .5 amp source, with a 3.5 ohm resistance in the atomizer. 5/3.5 = 1.43 amps, which is above the specifications of the power source. Isn't this the situation that many people see on their PC's with a USB passthru.

It's been a long time since my electronics classes in tech school, and the last few years I've spent with my nose in systems, software and database management. Guess I'm a bit rusty

.

Yes, the voltage will drop as it begins to melt. It cannot actually put out 1.43A, the voltage gets divided between itself and the output. The power shoots up (IxIxR) and the supply gets hot.

SQL, CMS, MVC, ... sounds like me

**NekoGurrl** · 08-02-2009, 02:54 PM

Originally Posted by kinabaloo

SQL, CMS, MVC, ... sounds like me

Gotta go where the jobs are.

Back in the 80's I was doing board level repairs. Those days are long gone, along with my eyesight. I spent most of my time working at TTL logic levels, analyzing logic gates and doing trace repairs. Then surface mount became the standard. Now it's all SQL and Python scripting...

**warp1900** · 08-02-2009, 03:40 PM

Originally Posted by NekoGurrl

Gotta go where the jobs are.

Back in the 80's I was doing board level repairs. Those days are long gone, along with my eyesight. I spent most of my time working at TTL logic levels, analyzing logic gates and doing trace repairs. Then surface mount became the standard. Now it's all SQL and Python scripting...

I didn't know nekos could be geeks also