GCSE Physics – Energy and 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
-I can describe how insulation can reduce energy loss
Quiz Summary
0 of 22 Questions completed
Questions:
Information
You have already completed the quiz before. Hence you can not start it again.
Quiz is loading…
You must sign in or sign up to start the quiz.
You must first complete the following:
Results
Results
0 of 22 Questions answered correctly
Your time:
Time has elapsed
You have reached 0 of 0 point(s), (0)
Earned Point(s): 0 of 0, (0)
0 Essay(s) Pending (Possible Point(s): 0)
Average score |
|
Your score |
|
Categories
- Not categorized 0%
- 1
- 2
- 3
- 4
- 5
- 6
- 7
- 8
- 9
- 10
- 11
- 12
- 13
- 14
- 15
- 16
- 17
- 18
- 19
- 20
- 21
- 22
- Current
- Review
- Answered
- Correct
- Incorrect
-
Question 1 of 22
1. Question
Can energy be transferred in a system?
CorrectIncorrect -
Question 2 of 22
2. Question
What does a closed system mean?
CorrectIncorrect -
Question 3 of 22
3. Question
What is the net energy change of a closed system?
CorrectIncorrect -
Question 4 of 22
4. Question
What is the equation for efficiency?
CorrectIncorrect -
Question 5 of 22
5. Question
What is the equation for efficiency?
CorrectIncorrect -
Question 6 of 22
6. Question
What are the units for efficiency?
CorrectIncorrect -
Question 7 of 22
7. Question
Rearrange the efficiency equation to find useful power out.
CorrectIncorrect -
Question 8 of 22
8. Question
What is the maximum possible efficiency?
CorrectIncorrect -
Question 9 of 22
9. Question
Why might a system not be 100% efficient?
CorrectIncorrect -
Question 10 of 22
10. Question
What type of energy is gravitational potential energy converted to when an object falls?
CorrectIncorrect -
Question 11 of 22
11. Question
What energy is wasted in a kettle?
CorrectIncorrect -
Question 12 of 22
12. Question
What energy is a wasted form in a light?
CorrectIncorrect -
Question 13 of 22
13. Question
What energy is a wasted form in a car’s brakes?
CorrectIncorrect -
Question 14 of 22
14. Question
What type of energy is wasted in all electrical appliances?
CorrectIncorrect -
Question 15 of 22
15. 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?
CorrectIncorrect -
Question 16 of 22
16. Question
Useful energy out is 56 J and total energy in is 160 J. What is the efficiency?
CorrectIncorrect -
Question 17 of 22
17. Question
Useful energy out is 400 J and total energy in is 8000 J. What is the efficiency?
CorrectIncorrect -
Question 18 of 22
18. Question
If power in is 100 W and efficiency is 40%, what is useful power out?
CorrectIncorrect -
Question 19 of 22
19. Question
If power in is 120 W and efficiency is 34%, what is useful power out?
CorrectIncorrect -
Question 20 of 22
20. Question
If power in is 50 W and efficiency is 20%, what is useful power out?
CorrectIncorrect -
Question 21 of 22
21. Question
How does insulation improve efficiency?
CorrectIncorrect -
Question 22 of 22
22. Question
What is insulation used to reduce?
CorrectIncorrect