iPod USB Power Adapter Wall Outlet

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Adrenalynn

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I found that chargers for iPads, not iPods, usually have the right specs ~ 2 amps:

Buy.com - Computers, Electronics, Digital Cameras, Books, DVDs, Music, Games, Software, Toys, Sports

I almost pounced on this, but it is adequately spec'd and not your fault that someone's brain fell out when writing the specs in its name. "5 V DC For iPod, iPad, iPhone - 12 V DC, 110 V AC, 220 V AC2.10 A "

As-written, that reads that it draws 2.10A @ 110vAC/220vAC. Should be written 5vDC 2.10A. Not your fault though and it does turn out the manufacturer specs it to deliver 2.10A max.
 

Adrenalynn

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It's still worth noting though that it still can't be claimed that just because it powers an iPod that it will provide adequate current. Just having an iPod/iPhone interface doesn't qualify the device.

Here's an iPod power supply that won't work: E-Tech eStore : Power Supply USB Charger HJ-03 (IC) :: 5 V 400-500mA ipod mp3

Another one that won't work: USB Car Charger for iPhone and iPod - K38058US - Kensington

Won't work: DealExtreme: $2.31 500mA Car Cigarette Powered USB Adapter/Charger (DC 12V/24V)

Won't work: 5V,500mA Solar Charger for iphone/ipod manufacturer - CN Topsolar Green Technology Co., Ltd. China 2371014 - ECVV

Just the first few links from a google search that won't even come _close_ to working. The upshot is that we _MUST_ pay attention to the max spec'd current output, and not make blanket general sweeping statements like: "yes you can" or "you can, I do it all the time" or "iPod adapter works fine"
 

Adrenalynn

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Oh gawd no.

James Watt called. From the grave he's rolling in. He requests you please resist the urge to provide advice for topics you don't understand.

watt.gif


He didn't look happy...
 
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Trish342

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It may take longer to charge because of varying amperages. But it will work eventually. 5 volts is 5 volts. All usb output is 5 volts or it is not usb.

BTW: You are right I am not an electrical engineer. I am an industrial engineer, and have had a little experience with electricity and OHM's law.

They are all not strong enough to power a pt.
 

Adrenalynn

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It may take longer to charge because of varying amperages. But it will work eventually. 5 volts is 5 volts. All usb output is 5 volts or it is not usb.

BTW: You are right I am not an electrical engineer. I am an industrial engineer, and have had a little experience with electricity and OHM's law.

Trish is exactly correct. They can't power a PT.

As I alluded, you'll want to look up Watt's Law, not Ohm's Law.

5 volts is not 5 volts when there's nothing pushing it. Voltage potential is only realized when something does work. Work is Power. Without a work product there is no work being done. Current is that power required to perform work. 1v at 5A has the potential to do twice as much work (power) as 5v at 0.5A.

Power (in Watts) is Volts x Amps.

A PT with a low resistance cartomizer needs at least 8.5 watts. So a 500mA power supply (as I linked multiples above) at 5v isn't going to cut it. A 2A power supply is a requirement. (5v x 2A = 10 watts). Trying to use that to power a PT is going to overheat the power supply instantly, causing a catastrophic failure.

And plugging a Lithium Ion battery directly into 5v hoping it will eventually get charged will have a very exciting (but generally undesirable) result anyway. Exciting as in "energetic". As in pretty flames shooting out. Voltage and Current must both be precisely controlled throughout the variable charge-cycle of the battery in the case of the various lithium chemistries (unless the cell is well protected. In which case, giving it a straight 5v will make it laugh at you. Laugh at you right after it instantly shuts off anything at all getting to the battery cell)

I believe that you will find current is also spec'd in the USB 2.0 specification. And in fact, these devices draw more current than is alloted in the USB 2.0 base spec. These devices AREN'T USB. You don't see the USB licensed logo anywhere on them. They have a connector that will fit the USB port.
 
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leeshor

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I'm thinking Van De Graaf generator. Lots of volts. no push. If 5v is 5v then what about a million volts, (that won't kill you).

Rechargeable cars using Lithium Ion have been a real issue due to the precise voltage and charging requirements. They have tended to be very unpredictable and unsafe under different and at times random conditions.
 
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