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Comparing Power Ratings and Energy Values


  • Power rating of an appliance = energy that it uses per second when it is operating at the maximum power it’s recommended.
  • To work out energy transferred use the equations above.
  • Higher power rating = more energy transferred in a given amount of time= cost more to run.
  • Food labels tell you how much energy is in food
  • It is important to eat the right types of food in order to get the right amount of energy into your body. Energy in food is measured in Kilojoules (KJ).

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