That's OK. Basically I am saying that a poorly designed power supply can cause problems irrespective of it's design. You don't happen to agree with me. The fact that an adapter [may be] designed poorly, or the device, may cause a problem when using an adapter that is over spec for the device it is to power and could damage it - even though your physics explanation makes sense. An inferior product can always damage another component.
Many people do not know that one is not really supposed to charge a cell phone via the same adaptor they charge their iPad with and vice versa, even though it is more or less "approved" by Apple, to wit:
Quote:
All iOS devices (and most smartphones) charge at 5 volts, the standard for USB devices. The difference between the iPhone and iPad adapters is the rated amperage—the iPad charger is rated to handle 2.1 amps, while the iPhone charger is rated for 1 amp. But the amperage rating is only a measure of the adapter's maximum capability—the actual amperage is determined by the load (i.e., the iPad or iPhone). According to Steve Sandler, founder and chief technical officer of AEi Systems, an electronics analysis company, modern battery-powered electronics have a lot of complexity between the charger and the battery, including battery-charging circuits within the device and battery-protection circuits in the lithium-ion battery itself. These circuits are designed to manage the flow of electricity to the battery, and if the circuits inside the iPhone were designed to tolerate 1 amp, but are routinely exposed to 2 amps, that could stress the system over time. "Even though you may not instantaneously say, 'Wow, I just destroyed my battery!' you may limit its life over the long term," Sandler says, "but you wouldn't know for a year or more." Our advice: Since Apple claims compatibility between the iPad charger and iPhone, pay for the extended two-year warranty for the iPhone to ride out your cell contract, and charge it however you like. If your battery degrades severely after the first year make Apple give you a new one.
~ From Popular
Mechanics
I certainly wouldn't charge my iPad with the cell phone charger. I have seen it done and the adapter gets hot. The battery life of an iPhone likely will be shortened if one charges the cell (iPhone) via the iPad charger. The battery in the iPhone is not user replaceable (for most consumers), so despite Apple's assertion that they are compatible, a shortened battery life means Apple gets to sell a new phone if the battery life is poor and we all know iPhones do not enjoy stellar battery life anyway; so if the battery life is shortened by incorrect charger use, the chargers are not 100% compatible.
I don't have an iPhone so Fruitco devotees are free to abuse their equipment as they see fit. I'd say the same logic would apply to pretty much any consumer grade device that needs to be charged or would otherwise use an AC adapter, but that is my opinion only.
EDITED: 18 Oct 2014 16:42 by FIXRMAN