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Cost of Energy

  1. Apr 22, 2010 #1
    1. The problem statement, all variables and given/known data
    Compute the cost per day of operating a lamp that draws a current of 1.90 A from a 110 V line. Assume the cost of energy from the power company is $0.0620 / kWh. NOTE: Enter your response with tenths precision.


    3. The attempt at a solution
    1.90*110V*.0620*24 = .310992
    but this answer is wrong
     
  2. jcsd
  3. Apr 22, 2010 #2

    PhanthomJay

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    you did divide by 1000 W/kW, but the problem asks for the answer to the nearest tenth (nearest dime).
     
  4. Apr 22, 2010 #3
    yeah i divided by 1000 at the end, but .3 is wrong
     
  5. Apr 23, 2010 #4

    PhanthomJay

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    Try $0.30
     
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