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Current and voltage rules in series and parallel circuits

8th grade (Year 9 in England) · 16 questions · Common Core: NGSS.MS-PS2-3, NGSS.HS-PS3-5 · England: KS3 Physics: Electricity and electromagnetism, GCSE Combined Science: Electricity (series and parallel)

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  1. Question 1

    Two lamps are in parallel. The current through one branch is 1 A and through the other is 0.1 A. What current flows from the battery, in A?

    AnswerA

  2. Question 2

    Two identical lamps are connected in parallel to a 6 V battery. What is the voltage across each lamp?

    • A. 12 V
    • B. 6 V
    • C. 3 V
    • D. 0 V

  3. Question 3

    Two lamps are connected in series to a 4.5 V battery. The voltage across the first lamp is 3 V. What is the voltage across the second lamp, in V?

    AnswerV

  4. Question 4

    A 1.2 A current leaves a battery and splits into two parallel branches. One branch carries 0.8 A. What current flows in the other branch, in A?

    AnswerA

  5. Question 5

    An ammeter reads 0.4 A before the first lamp in a series circuit. What will it read after the last lamp?

    • A. less than 0.4 A
    • B. 0.4 A
    • C. more than 0.4 A
    • D. 0 A

  6. Question 6

    Two lamps are connected in series to a 9 V battery. The voltage across the first lamp is 3 V. What is the voltage across the second lamp, in V?

    AnswerV

  7. Question 7

    A 2 A current leaves a battery and splits into two parallel branches. One branch carries 0.8 A. What current flows in the other branch, in A?

    AnswerA

  8. Question 8

    In a series circuit with three lamps, one lamp breaks. What happens to the other two?

    • A. they get brighter
    • B. they stay the same
    • C. only one goes out
    • D. they go out

  9. Question 9

    Two lamps are connected in series to a 4.5 V battery. The voltage across the first lamp is 3 V. What is the voltage across the second lamp, in V?

    AnswerV

  10. Question 10

    A 1.6 A current leaves a battery and splits into two parallel branches. One branch carries 1 A. What current flows in the other branch, in A?

    AnswerA

  11. Question 11

    In a series circuit with three lamps, one lamp breaks. What happens to the other two?

    • A. they go out
    • B. only one goes out
    • C. they stay the same
    • D. they get brighter

  12. Question 12

    Two lamps are connected in series to a 12 V battery. The voltage across the first lamp is 6 V. What is the voltage across the second lamp, in V?

    AnswerV

  13. Question 13

    A 2.8 A current leaves a battery and splits into two parallel branches. One branch carries 0.8 A. What current flows in the other branch, in A?

    AnswerA

  14. Question 14

    In a series circuit with three lamps, one lamp breaks. What happens to the other two?

    • A. they get brighter
    • B. only one goes out
    • C. they go out
    • D. they stay the same

  15. Question 15

    Two lamps are connected in series to a 9 V battery. The voltage across the first lamp is 2.25 V. What is the voltage across the second lamp, in V?

    AnswerV

  16. Question 16

    A 1.4 A current leaves a battery and splits into two parallel branches. One branch carries 1 A. What current flows in the other branch, in A?

    AnswerA

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Answer key: Current and voltage rules in series and parallel circuits

  1. 1. 1.1 A

  2. 2. B. 6 V

  3. 3. 1.5 V

  4. 4. 0.4 A

  5. 5. B. 0.4 A

  6. 6. 6 V

  7. 7. 1.2 A

  8. 8. D. they go out

  9. 9. 1.5 V

  10. 10. 0.6 A

  11. 11. A. they go out

  12. 12. 6 V

  13. 13. 2 A

  14. 14. C. they go out

  15. 15. 6.75 V

  16. 16. 0.4 A