You don't want to ever short anything ideally, even for the half a second it takes to unplug your phones. My method for turning off, is muting the sound, turn off the source, turn volume down on amp, turn off amp, unplug phones. Might be overkill, but it is by far the safest method.
A PC USB charger delivers 2.5 Watts of power (5 volts at 500 mA). An iPhone charger delivers 5 Watts (5 volts at 1000 mA). A Retina iPad mini charger delivers 10 watts (5.1 volts at 2100 mA
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So if you're using a 500mA charger with a phone that will draw up to 850mA, the phone will only draw 500mA, and will charge at a certain rate. If you switch to a 1000mA (1A) charger, the phone will draw 850mA while charging, and charge faster. If you switch to a 2A charger, the phone will still draw 850mA, and will charge no faster than when