Energy loss and Efficiency

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Across
  1. 5. although it can be 'lost' energy cannot be
  2. 7. the law of _______________ of energy
  3. 8. energy cannot be
  4. 10. when energy goes from one object to another this is called energy
  5. 11. a _______ can be called closed but is always open
Down
  1. 1. the productiveness of a system
  2. 2. to change one energy to another is to
  3. 3. a common form of excess energy is
  4. 4. hen energy is changed from one form to another it is
  5. 6. heat, light, sound,and kinetic, are all forms of
  6. 9. energy that we don't have a use for is _______ energy