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Homework Help: EMF and Internal Resistance (1)

  1. Oct 9, 2008 #1


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    1. The problem statement, all variables and given/known data
    A torch bulb is marked 2.5V and 0.3A. When it is connected to a dry battery of e.m.f 3.0V the correct p.d of 2.5V is produced across it. Calculate the internal resistance if the battery.

    2. Relevant equations

    3. The attempt at a solution
    It's on paper - sorry!

    Answer = 1.67 - But how you get to that is the question - working out must be shown.

    Thanks in advance,
    Last edited: Oct 9, 2008
  2. jcsd
  3. Oct 9, 2008 #2


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    Staff Emeritus
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    Gold Member

    We do not provide solutions here. We will help you will your homework, but you have to show some effort first, by typing out your attempted solution for example.

    The same goes for your other thread, "I don't know how to start" isn't an attempted solution.
  4. Oct 9, 2008 #3


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    OK Sorry,

    It's just I tried to find my tutor today, and couldn't see him, so i'm a little puzzled.

    Not to worry, have a good day.
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