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

AI Thread Summary
A potentiometer can measure an unknown electromotive force (emf) by comparing it to a known emf in a circuit. The device operates by balancing the voltage across a variable resistor, allowing for precise measurements. Various circuit configurations can utilize the potentiometer for this purpose, enhancing its versatility. Clarity in the explanation of how to set up the circuit is crucial for understanding its application. A more detailed description or reference to specific circuit configurations would improve comprehension.
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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