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Homework Help: Power (electric current)

  1. Apr 2, 2013 #1
    1. The problem statement, all variables and given/known data
    The power rating of an electric appliance is 1500 W. How much current does this appliance draw when it is used in a home electric circuit ( V= 120)?

    2. Relevant equations

    P= VI

    3. The attempt at a solution

    P= VI => I= P/V => I= 1500W/120V = 12.5A

    Is this correct? This seems way too simple ha ha ha.....so im not sure.
  2. jcsd
  3. Apr 2, 2013 #2


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    Homework Helper

    If this is an early assignment on the topic, you could expect it to be simple. If this is a final assessment assignment you could be forgiven for wondering.
  4. Apr 2, 2013 #3


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    Science Advisor
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    Gold Member

    It probably is that simple but ...

    The power rating is the maximum power that the device can draw. For example the 500W rated power supply in my PC draws a lot less in practice.
  5. Apr 2, 2013 #4
    Thanks for your input CWatters, this is one of the question from my assignment so i can only work with what i have.
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