Computer power supplies usually have higher efficiency on 230V than on 115V. Why? - Electrical Engineering Stack Exchange

As seen here in the example, this particular power supply (and most others too) has higher efficiency when running on 230V. Given that computer power supplies are usually required to output a combi

Apple power supply: thick AC cable, thin DC cable - why? - Electrical Engineering Stack Exchange

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Apple power supply: thick AC cable, thin DC cable - why? - Electrical Engineering Stack Exchange

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Why do some SMPS power supplies require an input voltage select switch? - Electrical Engineering Stack Exchange

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