GCSE Physics – Efficiency
Learning Objectives
-I can describe why a system might not be 100% efficient
-I can describe ways to increase the efficiency of a system
-I can use, rearrange and recall the units needed for efficiency = useful energy out / total energy in
-I can use, rearrange and recall the units needed for efficiency = useful power out / total power in
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Question 1 of 25
1. Question
Can energy be transferred in a system?
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Question 2 of 25
2. Question
What does a closed system mean?
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Question 3 of 25
3. Question
What is the net energy change of a closed system?
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Question 4 of 25
4. Question
How can efficiency be written?
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Question 5 of 25
5. Question
What is the equation for efficiency?
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Question 6 of 25
6. Question
What is the equation for efficiency?
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Question 7 of 25
7. Question
What are the units for efficiency?
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Question 8 of 25
8. Question
What is the equation to find the useful power out?
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Question 9 of 25
9. Question
What are the units for power?
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Question 10 of 25
10. Question
What is the maximum possible efficiency?
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Question 11 of 25
11. Question
Why might a system not be 100% efficient?
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Question 12 of 25
12. Question
What type of energy is gravitational potential energy converted to when an object falls?
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Question 13 of 25
13. Question
What energy is wasted in a kettle?
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Question 14 of 25
14. Question
What energy is a wasted form in a light?
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Question 15 of 25
15. Question
What energy is a wasted form in a car’s brakes?
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Question 16 of 25
16. Question
What type of energy is wasted in all electrical appliances?
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Question 17 of 25
17. Question
Useful energy out is 400 J and total energy in is 8000 J. What is the efficiency?
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Question 18 of 25
18. Question
Useful energy out is 56 J and total energy in is 160 J. What is the efficiency?
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Question 19 of 25
19. Question
Useful energy out is 1.2 x 106 J and total energy in is 4.8 x 107 J. What is the efficiency?
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Question 20 of 25
20. Question
If power in is 50 W and efficiency is 20%, what is useful power out?
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Question 21 of 25
21. Question
If power in is 120 W and efficiency is 34%, what is useful power out?
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Question 22 of 25
22. Question
If power in is 100 W and efficiency is 40%, what is useful power out?
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Question 23 of 25
23. Question
How does lubrication improve efficiency?
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Question 24 of 25
24. Question
How does insulation improve efficiency?
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Question 25 of 25
25. Question
How can a building be warmed up?
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