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Question about Power source

  1. Jan 25, 2010 #1
    1. The problem statement, all variables and given/known data

    What can I purchase so that I have a constant voltage that is cheap for my electromagnet and you can adjust to how many volts I want? Batteries will run out of power and not give good results. Also is there another easy way to precisely meaure the strength of the electromagnet other than using paperclips?

    2. Relevant equations

    3. The attempt at a solution
    I don't know.
  2. jcsd
  3. Jan 26, 2010 #2
    What I want is a power source other than batteries that won't run out of energy because once the batteries lose power, my results will be wrong.
  4. Jan 26, 2010 #3
    Why won't anyone help me!!
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