If an unused phone charger left plugged in apparently costs me money as its using my electricity, how does this not apply to a socket outlet that has a built in USB.
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Modern phone chargers use so little power that you’ll be able to keep them on for a year for pennies.
This is because only a few small components used to detect something connected need to be powered.
For a computer USB socket, the sending is done via the CPU or bridge which are always powered already so there’ll be no additional draw.
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