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Homework Help: Simple Potential Difference Question

  1. Feb 8, 2006 #1
    Can someone help me to describe the differences between a 12V car battery and a 9V radio battery. They both convert chemical energy into electrical energy, but the car battery has the capacity for much higher currents with similar voltage to the 9V.

  2. jcsd
  3. Feb 9, 2006 #2
  4. Feb 10, 2006 #3


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    Homework Helper

    The 12V car battery is made with 8 cells in series, each about 1.5 V ...
    How many cells do you think a 9V "transistor radio" battery has in it?
    Cut one apart lengthwise, if you want to check your expectation.

    Car batteries are usually "wet", the chemical reactions can occur quickly (and are more easily reversed); 9V battery cells are "dry" (moist paste)
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