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Cause and effect

  1. Aug 12, 2005 #1
    I have such a question in my physics book:

    There are 2 statements below. Choose a if the second statement is an explanation of the first statement; otherwise, choose b :

    1. Ammeter has a very small resistance.

    2. The current in the circuit can be said negligibly affected when the ammeter is connected in series with it correctly.

    I thought the answer should be b , as I thought that statement 1 should be the explanation of statement 2, not vice versa. But the answer said is a . Why?
  2. jcsd
  3. Aug 12, 2005 #2
    I would agree with you. Personally that's a very confusing and badly written question.

  4. Aug 12, 2005 #3


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    Gold Member

    Allow me to lend my support, gents. It might be a matter of semantics, though; Statement #1 is definitely the basis for Statement #2, but might not necessarily be an explanation for it. Regardless, it's a very poorly presented problem. Given the same choice that you were, I would have chosen similarly.
  5. Aug 12, 2005 #4
    In the future I suggest interpreting it as:

    Choose a if the second statement explains why the first statement is true; otherwise, choose b :
  6. Jan 7, 2010 #5
    2 is true *because* 1 is true. The ammeter has low resistance *because* it was made that way (Aristotle's Effective Cause), not because it has a negligible effect on the current.
  7. Jan 7, 2010 #6
    yeah. the reason that there is a negligible effect is that there is a small resistance. besides, the wording in 2 is that "it can be said". so now the question is, why can this be said?
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