Dismiss Notice
Join Physics Forums Today!
The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

Homework Help: Electric Circuits Homework Help

  1. Jan 20, 2010 #1
    1. The problem statement, all variables and given/known data
    What does it cost in cents to leave a 1800 Watt electric oven on for 7 hours? Assume that you pay 10 cents for every kilowatt hour which you use.


    2. Relevant equations
    Well i dont know if im supposed to use P=E/t. i dont know how im supposed to use it

    3. The attempt at a solution
    Do i not convert 1800 Watts to 1.8 Kilowatts, then multiply 1.8 by 7 hours..which is 12.6 then by .10 cents, which makes the answer 1.26?
    It is incorrect though.


    Thanks for your help.
     
  2. jcsd
  3. Jan 20, 2010 #2
    Wow nvm, i answered it 1.26 cents instead of 126 cents..-.- thanks anyways
     
Share this great discussion with others via Reddit, Google+, Twitter, or Facebook