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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Am I connecting this barrel jack correctly? Do I need a diode on pin 1 and if so what would be it's purpose? I've seen some examples on google with and without

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Two power supplies to ensure a specific voltage - Electrical Engineering Stack Exchange