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Do USB outlets draw power when not in use?

December 20, 2021

power strip with USB charging 

Do USB outlets draw power when not in use?

Nearly all AC to DC converters, by design, draw a very small idle current when you aren't charging any devices. Cheaper designs consume more while some good designs consume less, but unless there's a physical switch on the USB socket it will always consume some power while waiting for a device to be plugged in.1
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