1. Energy transfers in a TV
50J wasted
as Heat
10 J sound energy
40J light
energy
100J electrical
energy input

2. Energy transfers in a TV
40J light
energy
10 J sound energy
100J electrical energy input
100J energy output
50J wasted
as Heat
10 J sound energy
50J wasted
as Heat

3. Energy transfers in a TV
100J electrical energy input
100J energy output

4. Energy transfers in a TV
40J light
energy
100J electrical energy input
10 J sound energy
50J wasted
as heat

5. Energy transfers in a TV
40J light
energy
100J electrical energy input
10 J sound energy
50J wasted
as Heat

6. Make Sankey diagrams for these appliances:
A drill uses 1000J every second. The drill wastes 200J as sound and 400J as heat (use 1cm for. 100J)
A Plasma Screen TV uses 75J every second. 30J are transferred as heat, 10J as sound (use 1cm for 10J).
A microwave uses 800J every second. 150J are transferred as kinetic energy, 50J as light. All the rest goes into heating the food (use 1cm for 100J).
An electric oven uses 3000J every second, 1200J heats the surroundings, all the rest goes into the food (use 0.5cm for 100J).

7. Energy transfers in a drill
400J kinetic energy
1000J electrical energy input
200 J sound energy
400J
wasted
as heat

8. Energy transfers in a Plasma Screen TV
35J light energy
75J electrical energy input
30J
wasted
as heat
10 J sound energy

9. Energy transfers in a Microwave Oven
600J heat energy
800J electrical energy input
50 J light energy
150 J kinetic energy

10. Energy transfers in a Conventional Oven
1800J useful heat energy
3000J electrical energy input
1200 J wasted heat energy

11. A drill uses 1000J every second
A drill uses 1000J every second. The drill wastes 200J as sound and 400J as heat. What is the efficiency?
A TV uses 75J every second. 30J are transferred as heat, 12J as sound. What is the efficiency?
A microwave uses 800J every second. 50J are transferred as light, 5J as sound all the rest goes into heating the food. What is the efficiency?
An electric oven uses 3000J every second, 1200J heats the surroundings, all the rest goes into the food. What is the efficiency?