Does the adapter use power when there's no phone connected?

Hi all,
I was wondering: Does the Apple poweradapter consume electricity, when there's no iPhone (or iPad etc.) connected to it?
I leave my adapters and cables in a poweroutlet all the time, which I can turn off but I was just curious about this. I read different things all over the internet, so I thought it would be best to ask my question here.
I have the original Apple 10W adapters, with the lightning usb cable, iPhone 5 and iPad 4. I live in The Netherlands by the way, if that makes any difference.
Thanks!
Stefan

Wall adapters do use a very small amount ... but it is miniscule, and not worth considering. Though I suppose there would be an unacceptable loss in 'green' eyes if there were 10,000 of them connected.

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