Does anyone know how much energy is consumed for charging a iphone?

Hi, does anyone know how much energy is consumed for charging a iphone???
4W? how much does it cost??
Is there anyway I can test and check how much electricity I have been used for charging a iphone?
Thanks a lot!

Thank you very much for all your replies.
I am wondering if there is any application for iphone which can alarm or help me to know how much energy I have been consuming while charging, or using different applications. or even, if there is possibility of designing one with that function?
I am currently working on a project which is about the energy consumption of iphone applications. I have been working on my iphone (a 2 years old iphone 3G) and tried to find out the top 100 applications which consume the most electricity. Any suggestions or ideas?
If anyone is interested in this, you are all welcome to participate and send suggestions!

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