Energy revision crossword

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Across
  1. 4. Energy that is not transferred usefully is
  2. 5. mass x gravity x height
  3. 7. Reduce energy lost to friction by
  4. 12. energy cannot be ......
  5. 13. Energy transfer in solids is called
  6. 14. An energy resource that will run out and can't be replenished
  7. 15. The rate at which energy is transferred
  8. 16. what is the unit for power?
Down
  1. 1. Energy stored in stretched springs
  2. 2. Resource that is replaced as it is used
  3. 3. The idea that energy is not lost or gained
  4. 6. useful energy output/total energy input
  5. 8. energy 0.5 x mass x velocity2
  6. 9. Using a dam and river to generate electricity
  7. 10. Generating energy from the hot rocks
  8. 11. 1000 Watts is 1