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[–] Wargasm 0 points 2 points (+2|-0) ago 

That depends.

Battery powered devices are designed specifically to use as little power as possible; many simply disconnect the battery from the circuitry.

However, anything that is plugged into the wall is probably consuming more power than you think it is.

Many plugged-in devices use transformers to convert line voltages into voltages more suitable for the device. These transformers will continue to consume power even if the device is turned off.

Here's a pretty good article on it by the U.S. Department of Energy.