Quote:
Originally Posted by elcreative
I suspect that this is due to the standard USB having a rating of 500mA whereas the iPad charger is rated at 2A (4x the power) so whilst it'll charge the iPad, it'll take longer and the iPad will apparently tell you it isn't charging. For Sony eReaders, the PSU normally comes with the same rating (2A) but is happy (but slower) charging from a standard USB...  |
5 volts x 2 amps = 10 watts (for iPad according to earlier post)
5 volts x 0.7 amp = 3.5 watts (appx. what the Sony Readers use for charging)
If you try to pump 3 times the rated wattage into a device it is not going to go well. However, if Mr. Anal Retentive will stick with more standardized chargers for cellular phones which are typically no more than 4 watts then they should work, and ditto for AC adapters designed to accept USB cables.