Quote:
Originally Posted by elcreative
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...  |
I have an iPhone 3G. My wife has an iPad and an iPhone 3G. Now, if we use the AC adapter that comes with the iPhone, the iPhone charges just fine. But if we use the AC adapter that comes with the iPad, the iPhone doesn't show that the device has charged unless it is rebooted. So why then isn't the 3G taking just the power it needs and properly working to show it is taking a charge?