charger - Why are there two different output voltage ratings on some power supplies? and How it works? - Electrical Engineering Stack Exchange

some power supplies (ex. chargers) have two different output voltage ratings like: 5V 2A OR 9V 2A -why is that? -How the charger knows that my load needs 5V or 9V? and not damaging the load

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power supply - How do phone chargers have variable input voltage with constant output voltage? - Electrical Engineering Stack Exchange

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