Energy

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Across
  1. 5. The ... of the substance is the amount of energy required to raise the temperature of 1KG of the substance by 1 degrees
  2. 8. Energy ... created or destroyed
  3. 12. ...energy is energy transferred to where it is wanted in the form that is wanted
  4. 13. A ... is an object or group of objects in which no energy transfers take place out of or into the energy stores of the system
  5. 17. Thermal insulators are ... that do not allow thermal energy to move through them easily
  6. 18. Energy can be ... from one store to another
  7. 19. The unit of power is the ... , W.
  8. 20. ... is the force that opposes the motion of two surfaces in contact with each other
  9. 21. ... is energy that is not usefully transferred
  10. 22. Winds, waves and the tides are sources of ... energy
  11. 23. If an object ... move when a force is applied to it, no work is done on the object
  12. 25. ? = useful output energy + energy wasted
  13. 26. The less energy wasted by a machine, the more ... the machine is
  14. 28. Renewable energy currently cannot reach the world's ... for energy
Down
  1. 1. As changes occur in a closed system, energy can be transferred to ... stores with in the closed system
  2. 2. Appliances should be designed to waste as ... energy as possible to make them as efficient as possible
  3. 3. As energy ... it gets less and less useful
  4. 4. Efficiency is a ... so does not have a unit
  5. 6. ... radiation from the sun transfers energy to the earth. A solar cell transfers this energy into electrical energy directly
  6. 7. The principle of ... of energy applies to all energy changes
  7. 9. Work Done to ... friction is mainly transferred to thermal energy stores
  8. 10. ... are non-renewable sources of energy
  9. 11. The ... of an appliance is the rate at which is transfers energy
  10. 14. Most renewable resources are not available all the time and can be ...
  11. 15. When an object falls and gains speed, its gravitational potential energy decreases and its kinetic energy increases
  12. 16. ... can be transferred by heating, waves, electrical current or when a force moves an object
  13. 24. ... energy comes from energy released by radioactive substances deep under the earth's crust
  14. 27. When a ... moves an object, energy is transferred to the object and work is done on it