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2. If something supplies energy it also supplies what?

  • heat
  • power
  • energy
  • water

3. Where does the energy in a circuit come from?

  • the current flowing through it
  • water
  • fossil fuels
  • the national grid

4. What are sankey diagrams?

  • energy transformation diagrams
  • diagrams used to measure the cost of a machine/appliance

5. true or false: more efficient machines waste less energy?

  • true
  • false
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