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9th grade electricity and magnetism

9th grade (Year 10 in England) · 16 questions · Common Core: NGSS.HS-PS3-1, NGSS.HS-PS3-3 · England: KS4 Combined Science: Electricity, GCSE Combined Science: Electricity, GCSE Combined Science: Electricity (domestic uses and safety)

Name

Date

Score/ 16

  1. Question 1

    An appliance on a 12 V car battery draws a current of 10 A. What is its power, in W?

    AnswerW

  2. Question 2

    In a UK three-pin plug, which wire is this: stops a metal case becoming live?

    • A. live wire
    • B. neutral wire
    • C. earth wire

  3. Question 3

    A current of 0.5 A flows for 10 s. How much charge flows, in coulombs (C)?

    AnswerC

  4. Question 4

    A current of 2 A flows for 10 s. How much charge flows, in coulombs?

    AnswerC

  5. Question 5

    How long does it take for 7.5 C to flow when the current is 0.5 A, in s?

    Answers

  6. Question 6

    A 60 W device is used for 10 s. How much energy does it transfer, in J?

    AnswerJ

  7. Question 7

    1200 C of charge flows through a lamp in 10 minutes. What is the current, in A?

    AnswerA

  8. Question 8

    What is the difference between ac and dc?

    • A. there is no difference
    • B. ac comes from batteries
    • C. ac keeps reversing direction; dc flows in one direction only
    • D. dc is used in mains sockets

  9. Question 9

    Mains electricity: which statement is NOT true?

    • A. The fuse is connected in the live wire.
    • B. A battery supplies alternating current.
    • C. The earth wire only carries current when there is a fault.
    • D. Mains electricity in the UK is alternating current.

  10. Question 10

    An appliance on US mains (120 V) draws a current of 5 A. What is its power, in W?

    AnswerW

  11. Question 11

    In a UK three-pin plug, which wire is this: completes the circuit at about 0 V?

    • A. live wire
    • B. neutral wire
    • C. earth wire

  12. Question 12

    A current of 1.5 A flows for 60 s. How much charge flows, in coulombs (C)?

    AnswerC

  13. Question 13

    A current of 0.5 A flows for 10 s. How much charge flows, in coulombs?

    AnswerC

  14. Question 14

    How long does it take for 120 C to flow when the current is 4 A, in s?

    Answers

  15. Question 15

    A 1000 W device is used for 10 s. How much energy does it transfer, in J?

    AnswerJ

  16. Question 16

    600 C of charge flows through a lamp in 5 minutes. What is the current, in A?

    AnswerA

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Answer key: 9th grade electricity and magnetism

  1. 1. 120 W

  2. 2. C. earth wire

  3. 3. 5 C

  4. 4. 20 C

  5. 5. 15 s

  6. 6. 600 J

  7. 7. 2 A

  8. 8. C. ac keeps reversing direction; dc flows in one direction only

  9. 9. B. A battery supplies alternating current.

  10. 10. 600 W

  11. 11. B. neutral wire

  12. 12. 90 C

  13. 13. 5 C

  14. 14. 30 s

  15. 15. 10000 J

  16. 16. 2 A