Explaination of voltage dividers

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code: [select]

                  +5v
                   |
                   <
                   >     10k
                   <   resistor
                   <
                   >
                   |
analog pin 5------|
                   |
                   -----------| weather vane
                              | (mystery resistance)
                   -----------|
                   |
                   |
                 -----
                  ---
                   -


the above circuit diagram bit of example code sparkfuns weather meters have ordered , hoping have fun with.

i aware make arduino board equipment, wheres fun that?

basically want know is, how signal going pin 5 changes? surely remain contant , read needs taken after weather vane?

parts havn't arrived yet cant play (got shipped today)



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