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Does a power cord use energy when it is not pugged into a Mac? In other words, in order to save energy, should I pull the power cord out of the wall after my Mac has been recharged?

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Yes, the charger will use power when plugged in, but much less than when it is actually charging.

Once the mac is charged then unplug the power supply - it serves no purpose leaving it in, but if you forget it is not a huge waste of power...

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