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Yes, it does. Just because, say, your TV is not on or your cell phone is in your pocket and not charging, does not mean that you are not using power/energy. As long as you have a working cable plugged into a socket, energy will be transmitted, regardless of whether or not what it is connected to is on or not; so unplug when they're not in use! The best thing to do is buy a power strip, so that you can unplug everything all at once when leaving your home.

Although I have no direct sources, this question has been brought up in many articles and discussions, which I am sure you can find via Google. :)

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Q: Does it save energy to unplug power cables?
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