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So if a product requires 2.1 amps, then the power supply should supply 2.1 amps or more. If the power supply provides more than 2.1 amps, the product will still only take 2.1 amps. If the power supply only supplies 1 amp, the device may fail to charge, or it will charge very slowly. In other words:
For most mobile devices, the voltage to recharge the battery is typically five volts of direct current, shown as 5V DC. It's critical to match the voltage of a power supply or charger to the device you're charging. How many amps does a phone charger use? Most standard phone chargers supply between 1 to 2.4 amps.
It's critical to match the voltage of a power supply or charger to the device you're charging. If the device specifications read “5V DC,” then 5V DC must be applied to the product. Apply more volts such as 12V, and you run the risk of destroying the device.
It needs to match what your phone or tablet is designed to handle. For most mobile devices, the voltage to recharge the battery is typically five volts of direct current, shown as 5V DC. It's critical to match the voltage of a power supply or charger to the device you're charging.
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