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Homework Help: I don't understand this simplification question for Power

  1. Sep 12, 2010 #1
    1. The problem statement, all variables and given/known data
    Given that the unit of current is related to the units of electric charge and time by A = C/s, and the unit of voltage is related to the units of energy and charge by V = J•C^-1, express the power in terms of these other units. Simplify the result further, given that the watt (W) is defined by W = J/s

    2. Relevant equations
    A = C/s
    V = J•C^-1

    3. The attempt at a solution
    W = C/s • J•C^-1
    W = J/s

    Now what? I don't understand what the question is asking.
  2. jcsd
  3. Sep 12, 2010 #2


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    Science Advisor
    Homework Helper
    Gold Member

    They seem to be asking that since power is voltage times current, then it has units of J/s. Since a J/s is a watt, power has units of watts. You actually have the result.
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