1. Limited time only! Sign up for a free 30min personal tutor trial with Chegg Tutors
    Dismiss Notice
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: 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


    User Avatar
    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 ?
Share this great discussion with others via Reddit, Google+, Twitter, or Facebook