1. How can we make a robot more energy efficient?

2. iPod  Input energy = ?
Look at the Sankey diagrams on your tables, and work out the scale – one square = ? Joules
Then:
What are the output energy amounts?
What is the energy efficiency of the ipod?

3. Quick Calculations Power = 10 W, Time = 3 s, Energy = ?
Power = 3 kW, Time = 5 s, Energy = ?
Power = 3 kW, Time = 1 min, Energy = ?
30 J
600 J
15 kJ
180 kJ

4. Rearrange the equations
Energy = 500 J, Time = 25 s, Power = ?
Power = 200 W, Energy = 1 kJ, Time = ?
20 W
5 s

5. Upgrading a robot
Your task is to improve a robot to make it as energy efficient as possible
You need to think about how to calculate the energy efficiency of different parts of the robot

6. Task
Work out how much energy that part will use in the required time (Energy = Power x Time)
Work out the energy efficiency of each part (Energy efficiency = useful output energy / total input energy)
Are the upgrades always more energy efficient?

7. These are the answers, what are the questions?
10 J
50 W
1 minute