GCSE Physics – Transformers
Learning Objectives
-I can describe the structure of a transformer
-I can use, rearrange and can recall the units needed for V_p / V_s = n_p / n_s
-I can use, rearrange and recall the units needed for V_s I_s = V_p I_p
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Question 1 of 40
1. Question
What is the normal equation for power?
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Question 2 of 40
2. Question
What are the units for power?
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Question 3 of 40
3. Question
What are the units for voltage?
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Question 4 of 40
4. Question
What do transformers do?
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Question 5 of 40
5. Question
What type of current do transformers work with?
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Question 6 of 40
6. Question
What does a basic transformer consist of?
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Question 7 of 40
7. Question
How are the primary and secondary coil connected?
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Question 8 of 40
8. Question
What type of magnetic field do the primary coil and core produce together?
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Question 9 of 40
9. Question
Why is the magnetic field around the primary coil always changing?
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Question 10 of 40
10. Question
What does the changing magnetic field do to the secondary coil?
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Question 11 of 40
11. Question
What does the induced potential difference in the secondary coil cause?
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Question 12 of 40
12. Question
What are the coils of a transformer wound around?
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Question 13 of 40
13. Question
Why are iron cores used in transformers?
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Question 14 of 40
14. Question
What does the iron core do to the primary coil’s field?
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Question 15 of 40
15. Question
When a transformer is turned on, what happens in the first coil?
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Question 16 of 40
16. Question
The ratio of potential differences on transformer coils matches what?
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Question 17 of 40
17. Question
What are the two types of transformer?
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Question 18 of 40
18. Question
What does a step-up transformer do?
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Question 19 of 40
19. Question
In a step-up transformer, which coil has more turns?
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Question 20 of 40
20. Question
What does a step-down transformer do?
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Question 21 of 40
21. Question
In a step-down transformer, which coil has more turns?
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Question 22 of 40
22. Question
What is produced around the primary coil?
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Question 23 of 40
23. Question
What is the potential difference vs turns equation?
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Question 24 of 40
24. Question
What is V_p in the voltage vs turns equation?
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Question 25 of 40
25. Question
What is n_s in the voltage vs turns equation?
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Question 26 of 40
26. Question
What is the formula for power in a transformer?
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Question 27 of 40
27. Question
What is I_s in the transformer power formula?
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Question 28 of 40
28. Question
What are V_p and V_s measured in?
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Question 29 of 40
29. Question
What do we assume transformers do be?
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Question 30 of 40
30. Question
What is true of a 100% efficient transformer?
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Question 31 of 40
31. Question
A 230 V transformer has 10,000 turns on its primary coil and the output voltage is 23 V. How many turns are on the secondary coil?
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Question 32 of 40
32. Question
A transformer has an input voltage 240 V and output voltage of 12 V. If the primary coil has 5,000 turns, how many turns does the secondary coil have?
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Question 33 of 40
33. Question
In a transformer, the primary voltage is 24 V and the secondary voltage is 12 V. If there are 200 turns on the primary coil, how many turns are on the secondary coil?
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Question 34 of 40
34. Question
A primary transformer has a voltage of 240 V and a primary coil with 500 turns. What is the voltage in the secondary coil if it has 25 turns?
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Question 35 of 40
35. Question
A 230 V transformer has 11,500 turns on its primary coil and 600 on its secondary coil. What is the output voltage?
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Question 36 of 40
36. Question
A 230 V transformer has 11,500 turns on its primary coil and 14,000 on its secondary coil. What is the output voltage?
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Question 37 of 40
37. Question
A secondary coil has a current of 25 A and a voltage of 5 V. On the primary coil the current is 15 A. Find the primary voltage.
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Question 38 of 40
38. Question
A step-down transformer converts 11,500 V into 230 V. The power output is 2,000 W, so what is the current flowing in the primary coil?
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Question 39 of 40
39. Question
A step-down transformer converts 11,500 V into 230 V. The power output is 1000 W, so what is the current flowing in the primary coil?
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Question 40 of 40
40. Question
A step-down transformer converts 100 V into 230 V. The power output is 2,000 W, so what is the current flowing in the primary coil?
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