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Conversion: Joules to kWh

  1. Apr 7, 2009 #1
    To monitor the electrical energy usage of a room in a hotel, the 'Carbon Cops' install some measuring instruments. These gather data over 24 hrs as follows:
    - Total number of joules of energy used=20000000J (20MJ)
    - Voltage supplied = 240 V

    Convert the number of joules into kWh.
  2. jcsd
  3. Apr 7, 2009 #2


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    Homework Helper

    Welcome to PF.

    What are watts?

    Joules/s ... so how many seconds in an hour?

    That's watts/hour, so how many kw/h ?
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