15 Energy

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Across
  1. 5. Commercial larger unit related to power.
  2. 7. Law stating total energy remains constant.
  3. 9. Physical meaning of power.
  4. 12. Type of potential energy stored in stretched spring.
  5. 13. Total mechanical energy remains this in absence of friction.
  6. 14. Essential condition for mechanical work.
Down
  1. 1. Loss of useful energy as heat in machines.
  2. 2. Sum of kinetic and potential energy.
  3. 3. Unit used in electricity billing.
  4. 4. Type of potential energy due to height.
  5. 6. Conversion of energy from one form to another.
  6. 8. Device showing continuous energy conversion.
  7. 10. Quantity whose square determines kinetic energy.
  8. 11. Motion where only gravity acts on the body.
  9. 12. Ratio of useful output energy to input energy.