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intelogentFlag for United States of America

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USB phone chargers - are all chargers equal

what is the standard for USB


can u compare the measure of amps and volts comming from my PC  vs a wall charger ? and are all wall chargers made equal?  

.I have been told some are 2 amp   others are one amp.... can anyone comment on this and  help me learn  ?
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Eirman
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There is a widely recognised European standard which is gaining wider acceptance
http://en.wikipedia.org/wiki/Common_external_power_supply

A decent charger such as this has a CE quality mark and can deliver up to 2 Amps
without the voltage dropping below 5V.
I wouldn't bother with lower ratings.

Also look for ....
Surge protection
Temperature and short circuit protection
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ASKER

ok,

thanks...  do all usb ports of a computer output the same volts and amp.... and would you know what that is please   ?
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i just ordered the meter... thanks