Transformer Question

Step Up/Down Voltage Transformer Converter, 750 Watts

Here’s a question for everyone:  does a transformer use electricity if there is no load on it?  If so, how much?  The max or whatever it is drawing?  Here’s why I’m asking:

We have a 220v to 110v transformer (rated at 500w I think).  I have my xbox plugged into it because I can’t find a goofy aftermarket power supply for my xbox here in the UK (well, I found one, but it eventually started going bad and making electric noise that tanked my internet speed when it was on).  If my xbox is off–assuming no load on the transformer–is any electricity being consumed.  I don’t see how, but I don’t know too much about transformers either…..

Image from Karmor via flickr

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