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Explaination to potentiometers ?

  1. Mar 4, 2015 #1
    Hey Guys,
    Im desperate for help on that topic. I have no idea how the device work so an explanation would be appreciated; if someone can give me a hint on solving the problems when there are two cells in a circuit with different emf and the question says that when the potentiometer is at distance x emf is zero and then starts moving the slide of the device and asks about changes. Thanks
     
  2. jcsd
  3. Mar 4, 2015 #2
    The potentiometer is a device which resistance depends on the position of a cursor. This means that they are variable resistors, where the resistance is proportional to a constant (in units of ohm/meter) times a distance.
     
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