Quote:
Originally Posted by elemenoP
But it is also true that no one on this post has commented on what happens if the charger is rated *too high.* For example, elcreative, you say that 500-2000mA should work fine. What if the charger is rated 3000mA? Does such a charger exist? Would it fry the device, or would the device "take what it needs?
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Over voltage is the one to look out for. USB ports are rated at 5v and are capable of supplying 500ma of current. When nothing is plugged, in the voltage will be present but no current will be flowing. At any given voltage the current will be determined by the load (resistance). So, if you plug your Sony (an almost fixed resistance) into a charger rated at 5v/3000ma the Sony will use as much current as it needs and no more.
Think of your water system. You have a pipe coming into your house carrying water (current) at a given pressure (voltage). Open a tap (variable resistance) and water flows. Open it more and more water will flow - but no more than you want. As long as your pressure is contained by your system you are OK.
So, if you have a charger that has a plug that fits and is rated at 5v and can supply at LEAST 500ma you are good to go.
Regards - John