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Homework Help: Electric energy

  1. May 18, 2007 #1

    tdk

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    1. The problem statement, all variables and given/known data
    a flashlight bulb is connected across a 3.0-V difference in potential. The current through the lamp is 1.5 A.
    a. what is the power rating of the lamp?
    b. how much electric energy does the lamp convert in 11 minutes?


    2. Relevant equations
    P=I*V


    3. The attempt at a solution
    a. P=(3.0)(1.5)
    P=4.5
    b.?
     
  2. jcsd
  3. May 18, 2007 #2
    Power, which is in Watts, is Joules/Seconds. Energy is described in Joules. Does this help?
     
  4. May 18, 2007 #3
    To make it clearer to the OP, power is energy consumed in unit time.
     
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