3.2.2 Resistors in series and in parallel Quiz: Pearson Edexcel Physics, Unit 3

The 20 questions

1. The total resistance of resistors connected in series is:

   • The sum of the individual resistances.
   • The product of the individual resistances.
   • The average of the individual resistances.
   • The reciprocal of the sum of the reciprocals.

2. For resistors connected in parallel, the total resistance R_T satisfies:

   • R_T = (R_1 + R_2 + ...)/n only
   • 1/R_T = 1/R_1 + 1/R_2 + ...
   • R_T = R_1 x R_2 x ...
   • R_T = R_1 + R_2 + ...

3. Two 6.0 ohm resistors are connected in parallel. What is the total resistance?

   • 1.5 ohm
   • 12 ohm
   • 3.0 ohm
   • 6.0 ohm

4. Three 3.0 ohm resistors are connected in series. What is the total resistance?

   • 9.0 ohm
   • 27 ohm
   • 3.0 ohm
   • 1.0 ohm

5. Resistors of 10 ohm, 20 ohm and 30 ohm are in series across a 12 V supply. What is the current?

   • 0.40 A
   • 0.60 A
   • 0.10 A
   • 0.20 A

6. A 4.0 ohm and a 12 ohm resistor are connected in parallel. What is their combined resistance?

   • 0.33 ohm
   • 8.0 ohm
   • 3.0 ohm
   • 16 ohm

7. Three 6.0 ohm resistors are connected in parallel. What is the combined resistance?

   • 6.0 ohm
   • 0.56 ohm
   • 2.0 ohm
   • 18 ohm

8. A 4.0 ohm resistor is in series with a parallel combination of 6.0 ohm and 3.0 ohm resistors. What is the total resistance?

   • 4.0 ohm
   • 2.0 ohm
   • 9.0 ohm
   • 6.0 ohm

9. Two resistors, each of resistance R, are connected in parallel. What is the combined resistance?

   • 2R
   • R/2
   • R
   • R^2

10. A 100 ohm and a 300 ohm resistor are in series across a 12 V supply. What is the potential difference across the 100 ohm resistor?

    • 6.0 V
    • 9.0 V
    • 3.0 V
    • 1.5 V

11. The total resistance of a parallel combination is always:

    • Greater than the largest individual resistance.
    • Equal to the largest individual resistance.
    • Equal to the sum of the resistances.
    • Less than the smallest individual resistance.

12. A 2.0 ohm resistor is in parallel with a second resistor R_2. The combined resistance is 1.2 ohm. What is R_2?

    • 5.0 ohm
    • 3.0 ohm
    • 1.2 ohm
    • 0.8 ohm

13. A 5.0 ohm lamp is in series with a variable resistor. The combined resistance is 20 ohm and the supply is 10 V. What is the current?

    • 2.0 A
    • 0.50 A
    • 0.25 A
    • 1.0 A

14. A 2.0 ohm and a 6.0 ohm resistor are in parallel across a 6.0 V supply. What is the total power dissipated?

    • 6.0 W
    • 36 W
    • 18 W
    • 24 W

15. A 2.0 ohm resistor is in series with a 3.0 ohm and a 6.0 ohm resistor in parallel. What is the total resistance?

    • 4.0 ohm
    • 11 ohm
    • 2.0 ohm
    • 3.0 ohm

16. Three resistors of 2.0 ohm, 4.0 ohm and 4.0 ohm are connected in series. What is the total resistance?

    • 2.7 ohm
    • 10 ohm
    • 4.0 ohm
    • 0.5 ohm

17. A 1.0 ohm resistor and a 2.0 ohm resistor are in parallel. A 3.0 ohm resistor is in series with them. What is the total resistance?

    • 6.0 ohm
    • 3.7 ohm
    • 1.7 ohm
    • 2.7 ohm

18. A 12 ohm and a 4.0 ohm resistor are in parallel and are connected in series with a 2.0 ohm resistor. What is the total resistance?

    • 18 ohm
    • 5.0 ohm
    • 3.0 ohm
    • 8.0 ohm

19. Two resistors of 3.0 ohm and 6.0 ohm are in parallel across a 9.0 V supply. What power is dissipated in the 3.0 ohm resistor?

    • 27 W
    • 9.0 W
    • 81 W
    • 13.5 W

20. Two 4.0 ohm resistors in parallel are connected in series with a 1.0 ohm resistor. What is the total resistance?

    • 9.0 ohm
    • 2.0 ohm
    • 3.0 ohm
    • 5.0 ohm

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