GCSE Physics – Efficiency calculations

Last updated: 09/07/2020
CCEA GCSE Science – Physics foundation Energy GCSE Physics – Efficiency calculations

Learning Objectives

-I can relate building structure to cooling of a building
-I can calculate efficiency
-I can recall the units needed for efficiency = useful energy out / total energy in
-I can rearrange efficiency = useful energy out / total energy in
-I can use efficiency = useful energy out / total energy in

  1. 1
  2. 2
  3. 3
  4. 4
  5. 5
  6. 6
  7. 7
  8. 8
  9. 9
  10. 10
  11. 11
  12. 12
  13. 13
  14. 14
  15. 15
  16. 16
  17. 17
  18. 18
  1. Current
  2. Review
  3. Answered

  1. Can energy be transferred in a system?

    • 1.
    • 2.
    • 3.
    • 4.

  2. What does a closed system mean?

    • 1.
    • 2.
    • 3.
    • 4.

  3. What is the net energy change of a closed system?

    • 1.
    • 2.
    • 3.
    • 4.

  4. What type of energy is wasted in all electrical appliances?

    • 1.
    • 2.
    • 3.
    • 4.

  5. What energy is wasted in a kettle?

    • 1.
    • 2.
    • 3.
    • 4.

  6. What energy is a wasted form in a light?

    • 1.
    • 2.
    • 3.
    • 4.

  7. What energy is a wasted form in a car’s brakes?

    • 1.
    • 2.
    • 3.
    • 4.

  8. What type of energy is gravitational potential energy converted to when an object falls?

    • 1.
    • 2.
    • 3.
    • 4.

  9. What is the equation for efficiency?

    • 1.
    • 2.
    • 3.
    • 4.

  10. What are the units for efficiency?

    • 1.
    • 2.
    • 3.
    • 4.

  11. What is the maximum possible efficiency?

    • 1.
    • 2.
    • 3.
    • 4.

  12. Why might a system not be 100% efficient?

    • 1.
    • 2.
    • 3.
    • 4.

  13. How can a building be warmed up?

    • 1.
    • 2.
    • 3.
    • 4.

  14. How does lubrication improve efficiency?

    • 1.
    • 2.
    • 3.
    • 4.

  15. How does insulation improve efficiency?

    • 1.
    • 2.
    • 3.
    • 4.

  16. Useful energy out is 400 J and total energy in is 8000 J. What is the efficiency?

    • 1.
    • 2.
    • 3.
    • 4.

  17. Useful energy out is 56 J and total energy in is 160 J. What is the efficiency?

    • 1.
    • 2.
    • 3.
    • 4.

  18. Useful energy out is 1.2 x 106^6 J and total energy in is 4.8 x 107^7 J. What is the efficiency?

    • 1.
    • 2.
    • 3.
    • 4.