switch mode power supply - Why do these USB mobile phone chargers have multiple output ratings? - Electrical Engineering Stack Exchange

PSU that comes with any electronics device usually has a single output voltage rating. This is because they are intended for use with a single device. These Samsung phone chargers have multiple out

My power supply has 12V and 2000mA - if 2000mA=2A why put 2000mA and not just put 2A? - Electrical Engineering Stack Exchange

charger - Can a 9.6V Ni-MH battery be charged by unregulated 9V adaptor with 13.5V output? - Electrical Engineering Stack Exchange

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switch mode power supply - How is the output voltage of a mobile phone charger fixed to a rated value? - Electrical Engineering Stack Exchange

power supply - Powering many external 3.5 HDDs (USB) by an ATX PSU - Electrical Engineering Stack Exchange