1. Energy transfers & efficiency
Energy can never be made or destroyed; it can only be changed from one form into another
During an energy transfer, some energy is wasted. The less wasted energy, the more efficient the device
Energy is normally wasted as heat energy to the surroundings
Efficiency = Useful energy changed / Total energy supplied
Energy transfers & efficiency

2. Forms of Energy
Forms of Energy

3. Energy transfers
Energy transfers

4. Electrical Energy
Electrical energy

5. Energy efficiency
Energy efficiency

6. Energy efficiency
Energy efficiency

7. Energy efficiency
Energy efficency

8. Energy is measured in Joules (J)
Work done
Energy is measured in Joules (J)
When a force moves an object, energy changes from one form to another and work is done
Work done = Force x Distance
Work done

9. Work done
Work done

10. Work done
Work done

11. Work done
Work done

12. Power is measured in Watts or kilowatts Power = Work done / Time taken
Power is a measure of how fast the energy changes from one form to another. It is the rate at which work is done
Power is measured in Watts or kilowatts
Power = Work done / Time taken
1 Watt means that 1 Joule of energy was changed in 1 second
Power

13. Power
Power

14. Power
Power

15. Kinetic energy is the energy of a moving object
Kinetic energy increases with greater mass and greater speed
Kinetic energy = ½ x mass x speed
Kinetic energy

16. Kinetic Energy
Kinetic energy

17. Gravitational Potential energy
Electrical energy can be changed into gravitational potential energy
Gravitational potential energy is the energy stored in an object because of its height above ground
Weight = mass x gravitational field strength
Gravitational potential energy = Weight x Height
Gravitational Potential energy

18. Kinetic and Potential energy

19. Gravitational Potential energy

20. Wordsearch
Wordsearch

21. Quiz
Quiz