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7502-B - Electric Circuits

This document contains an IGCSE Co-ordinated Science question bank on electricity and electric circuits. It includes multiple choice and short answer questions about topics like earthing, fuses, circuit breakers, alternating current, batteries, resistance, series and parallel circuits. The questions are divided into three parts and include answers and marking schemes.

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atreyo basu
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89 views59 pages

7502-B - Electric Circuits

This document contains an IGCSE Co-ordinated Science question bank on electricity and electric circuits. It includes multiple choice and short answer questions about topics like earthing, fuses, circuit breakers, alternating current, batteries, resistance, series and parallel circuits. The questions are divided into three parts and include answers and marking schemes.

Uploaded by

atreyo basu
Copyright
© © All Rights Reserved
We take content rights seriously. If you suspect this is your content, claim it here.
Available Formats
Download as PDF, TXT or read online on Scribd
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002

IGCSE Co-ordinated Science

Physics
Question Bank

Electricity
▪ Electric circuits

Book No: 7502 - B

Name: ____________________ Homework:

Date: ____________________ Remark: ___________________

Incharge Sign: ___________________


ELECTRIC CIRCUITS
1) Earthing allows the passage of excess current into the earth, thus preventing
electrocution or excess heating.
2) Fuses and circuit breakers block the flow of current if it exceeds a certain value. This
allows the device to turn off if damaging current passes through it.
3) Mains electricity is alternating current, where the direction of current switches after a
certain duration of time.
4) Batteries provide direct current, where the direction of flow of current is in one
direction.
5) The frequency of alternating current refers to the number of times the current switches
direction in one second.
6) A fuse consists of a thin filament which heats up and melts as the current gets very
high. This breaks the circuit which ensures the device is not damaged by the high
current.
7) A circuit breaker uses an electromagnet which forces contact apart if the current gets
too high. This allows the circuit breaker to be reset.
8) For resistors in series,
𝑅 = 𝑅1 + 𝑅2 + 𝑅3 + ⋯
9) For resistors in parallel,

1 1 1 1
= + + +⋯
𝑅 𝑅1 𝑅2 𝑅3

10) For light-dependent resistors and thermistors, as the light intensity or temperature
increases, the resistance decreases.
11) A series circuit is used when one component must affect another component. A parallel
circuit is used when the two components must not affect each other.
12) For components in parallel, the components have the same voltage. For components in
series, the components have the same current.
PART I
1.

2.

3.

1
4.

5.

2
6.

7.

3
8.

9.

10.

4
11.

12.

13.

5
14.

15.

16.

6
17.

18.

19.

7
20.

21.

8
22.

23.

24.

25.

9
PART II

1.

10
2.

11
3.

12
13
4.

14
5.

15
16
6.

7.

17
18
8.

19
9.

20
21
10.

11.

22
12.

23
13.

24
25
14.

26
15.

27
16.

28
29
17.

30
31
18.

32
33
19.

34
20.

35
PART III

1.

36
37
38
2.

39
40
3.

41
42
43
4.

44
45
46
MARKSCHEME
PART I

Questions Answers Questions Answers

1. C 13. A

2. C 14. A

3. A 15. B

4. A 16. D

5. C 17. B

6. A 18. A

7. A 19. B

8. B 20. C

9. B 21. A

10. A 22. C

11. D 23. C

12. C 24. A

25. A

47
PART II
1.

2.

3.

48
4.

5.

6.

7.

49
8.

9.

10.

11.

50
12.

13.

14.

15.

51
16.

17.

18.

19.

52
20.

PART III
1.

53
2.

3.

4.

54

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