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

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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Moderate Energy for Charging Li‐Ion Batteries Determined by First‐Principles Calculations - Chen - 2018 - Batteries & Supercaps - Wiley Online Library

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

KORAD KD3005D - Precision Variable Adjustable 30V, 5A DC Linear Power Supply Digital Regulated Lab Grade… : Industrial & Scientific

Dyson DC16 vaccuum charger rated 28Vdc on the output, but measures 24-27V on connecting and (very) slowly drops to 18V while connected. What could be the problem? : r/AskElectronics

components - Spark gap schematic symbol help - Electrical Engineering Stack Exchange

Fuel cell-based hybrid electric vehicles: An integrated review of current status, key challenges, recommended policies, and future prospects - ScienceDirect

Why are there two different output ratings (two pairs of each voltage and amperage) on my AC adapters? What does it mean? - Quora

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Part 2: How Do Switching Power Supplies Work? A Historical Overview of Revolutionary Power Supply Technologies｜The World of Power Electronics｜Learn about Technology with TDK

KORAD KD3005D - Precision Variable Adjustable 30V, 5A DC Linear Power Supply Digital Regulated Lab Grade… : Industrial & Scientific