GCSE Physics – Efficiency calculations
Learning Objectives
-I can relate building structure to cooling of a building
-I can calculate efficiency
-I can recall the units needed for efficiency = useful energy out / total energy in
-I can rearrange efficiency = useful energy out / total energy in
-I can use efficiency = useful energy out / total energy in
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Question 1 of 18
1. Question
Can energy be transferred in a system?
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Question 2 of 18
2. Question
What does a closed system mean?
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Question 3 of 18
3. Question
What is the net energy change of a closed system?
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Question 4 of 18
4. Question
What type of energy is wasted in all electrical appliances?
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Question 5 of 18
5. Question
What energy is wasted in a kettle?
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Question 6 of 18
6. Question
What energy is a wasted form in a light?
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Question 7 of 18
7. Question
What energy is a wasted form in a car’s brakes?
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Question 8 of 18
8. Question
What type of energy is gravitational potential energy converted to when an object falls?
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Question 9 of 18
9. Question
What is the equation for efficiency?
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Question 10 of 18
10. Question
What are the units for efficiency?
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Question 11 of 18
11. Question
What is the maximum possible efficiency?
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Question 12 of 18
12. Question
Why might a system not be 100% efficient?
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Question 13 of 18
13. Question
How can a building be warmed up?
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Question 14 of 18
14. Question
How does lubrication improve efficiency?
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Question 15 of 18
15. Question
How does insulation improve efficiency?
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Question 16 of 18
16. Question
Useful energy out is 400 J and total energy in is 8000 J. What is the efficiency?
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Question 17 of 18
17. Question
Useful energy out is 56 J and total energy in is 160 J. What is the efficiency?
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Question 18 of 18
18. Question
Useful energy out is 1.2 x 10^6 J and total energy in is 4.8 x 10^7 J. What is the efficiency?
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