Calculating Efficiency of Energy Transfers
|
|
Name |
Total
Energy input (Joule) |
Useful
Energy output (Joule) |
Efficiency
(%) |
|
1. |
Light
bulb |
1,000 |
150 |
|
|
2. |
Kettle |
12,000 |
10,000 |
|
|
3. |
Washer |
14,000 |
7,000 |
|
|
4. |
Hoover |
2,000 |
500 |
|
|
5. |
Torch
bulb |
100 |
5 |
|
|
6. |
Car |
120,000 |
80,000 |
|
|
7. |
Television |
5,000 |
50 |
|
|
8. |
CD
player |
400 |
20 |
|
|
9. |
Microwave |
9,000 |
6,000 |
|
|
10. |
Can
opener |
8,000 |
100 |
|