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Homework Help: Potential difference

  1. Jan 30, 2008 #1
    A lightning flash transfers 4.2 C of charge and 4.5 MJ of energy to the Earth.

    (a) Across what potential difference did it travel?

    (b) How much water could this boil and vaporize, starting from room temperature?
  2. jcsd
  3. Jan 30, 2008 #2


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    Homework Helper

    Right right....What do you think you need to do for the first part, well rather how do you think you need to do it?
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