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Can I Use 2a Charger For 1a Device. It its safe to use a 5V 1a wall plug with a 5V 2a device. 500ma or milliamps is the same as one half or 05 amps.
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Older devices use Apples 30-pin dock connector. To charge the device faster chargers increase the amperage which is measured in amperes A. Secondly the Current of the USB power supply should equal what the device requires or be larger.
This depends on the manufacturer of the adaptercharger.
It its safe to use a 5V 1a wall plug with a 5V 2a device. A milliamp is just 11000th of an amp meaning that there are. Under the same voltage if your device is rated at 2A it will only take around 2A from a 3A output of the USB power supply leaving a 1A. The 2A rating means that the power adapter is capable of supplying anything from 0 up to 2 Amps to the device.
