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Homework Help: Power in batteries

  1. Feb 28, 2005 #1
    Hi,

    I have a pretty straightforward problem that I am screwing up on for unknown reasons. Basically, it's about two D-cell 1.5-V babtteries connected in series. The give the current and you calculate the resistance and power -- simple enough. But then they ask by what factor would the power increase if four D-cells were connected (and why this would be dangerous). I have no clue. I figured given the relationship between power and voltage that it would be 2, but they say it's 4.

    But P=IV!!
     
  2. jcsd
  3. Feb 28, 2005 #2
    if the resistance unchange, double the voltage will also double the current
     
  4. Feb 28, 2005 #3
    ohhhh i see. cool, thanks
     
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