You don't pump wattage into anything, a device draws as much current as it needs... it's voltage that's crucial. A PSU that supplies 5V and has 10A available will still only supply what a device requires... if it's 2A then that's what it'll take, if 500mA then the same but if 15A then it'll take 10A and whilst it might want another 5A, it won't get them. It'll either burn out the PSU or, more likely with overload protection being common, just get the 10A (or it could just shut the PSU down) but you don't get 10A flooding into a device that needs 2A...
Quote:
Originally Posted by jswinden
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.
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