Memory Anchor:

• Super Challenge:

  Stretch:

  Challenge:

Key Questions:

1. What is the equation used to calculate energy efficiency?
   • The Energy efficiency for any Energy transfer can be calculated using the equation: efficiency = useful output Energy transfer / total input Energy transfer
2. What two ways can be used to reduce unwanted energy transfers?
   • The ways you can reduce unwanted Energy transfers is by using lubrication or the use of thermal insulation.
3. (HT) How is the efficiency of an intended energy transfer increased?
   • (HT) The efficiency of an intended Energy transfer is increased by increasing the amount of Energy transferred usefully and decreasing the amount of wasted Energy.