How a potentiometer can be used to measure an unknown emf?

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Joza
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Could someone perhaps explain how a potentiometer can be used to measure an unknown emf? My book gives a bad explanation...
 
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There must be more than just a potentiometer? Can you quote some of your book?
 
Indeed, please tell us the explanation your book used. There are several circuit configurations where the pot can be used to determine an unknown voltage.
 
Well there is a known emf in the circuit and an unknown emf, and a potentiometer. I don't have the book at hand right now sorry...

I thought the explanation wasn't clear enough.
 

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