can i use a 5v 2a charger with a 5v 1a device

The smaller rated 1A charger is likely to overheat when used in this manner. However, the charger will only supply as much current as the device it's powering is asking for. In the worst case it could even catch fire so don't do this. A 1A device means that, for a power supply at a certain voltage (5V for USB), the device will "ask" for 1A from the power supply. Using the 5V 1A charger to operate a device that is normally charged with a 5V 2A charger is a bad idea. So, plugging a 1A device into a 2A charger will be fine. If your device is rated at 2A and your USB power supply gives a maximum of 2A or even can’t reach 2A, it means it is working at 100% and will heat up. For a 1A charger, it means the electronic devices in the charger can handle 1A before they break. So if that is 1A it will draw 1A whether you use a 2A or 2,000,000A charger. Not at all. So, as long your device needs less power than the USB power supply can provide, no need to worry. 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 of headroom. The device that the charger is plugged into determines the current drawn from the charger. In fact, a higher amperage charger will likely charge your phone even faster, and it can do so safely. Basically, all modern batteries are built with with a chip that regulates the input—they will allow what they can handle. I accidentally-on-purpose used a 5V 2A adapter with a 12V 1A device and the device conked out on me. Does that mean you can’t use a 5V/2.1A charger, or even a 9V/2A charger (in the case of USB-C)? The device will only ask …

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