Electronics Worksheet: Parallel Circuits

Electronics lesson 9: Parallel circuits · Set 150 · 40 questions

Remember (A path for each): Each bulb has its own path: removing one leaves the others glowing. Each bulb gets the full battery voltage. Total current = add the current of each path (n identical bulbs → n × one bulb’s current).

1. 1.💡 In a parallel circuit, one bulb breaks. What happens to the others? (a) they get dimmer (b) they keep glowing (c) they all go out (d) they explode
2. 2.💡 4 identical bulbs are in parallel and each bulb has its own switch on its path. 3 of the switches are OFF and the rest are ON. How many bulbs glow?
3. 3.💡 Why is house wiring done in parallel? (a) to save copper only (b) each gets full voltage (c) to make bulbs dim (d) so all go off together
4. 4.💡 3 identical bulbs are in parallel and each bulb has its own switch on its path. 2 of the switches are OFF and the rest are ON. How many bulbs glow?
5. 5.💡 3 identical bulbs are joined in parallel (each on its own side-by-side path) with a battery and a closed switch on the main wire. Bulb 2 is taken out of its holder. How many bulbs glow?
6. 6.True or false: “a single current path” is true of a series circuit. (a) True (b) False
7. 7.True or false: “a break stops every bulb” is true of a series circuit. (a) True (b) False
8. 8.True or false: “many paths for current” is true of a series circuit. (a) False (b) True
9. 9.True or false: “one bulb out, all go out” is true of a series circuit. (a) True (b) False
10. 10.💡 3 identical bulbs are in parallel and each bulb has its own switch on its path. 1 of the switches is OFF and the rest are ON. How many bulbs glow?
11. 11.💡 2 identical bulbs are joined in parallel across a 9 V battery (ideal wires). How many volts does each bulb get? =
12. 12.💡 A battery lights 4 identical bulbs joined in parallel. One more identical bulb is added in parallel. How do the bulbs glow now? (a) the same (b) brighter (c) dimmer
13. 13.💡 5 identical bulbs are joined in parallel across a 4.5 V battery (ideal wires). How many volts does each bulb get? =
14. 14.💡 5 identical bulbs are in parallel and each one takes 1.5 A. What total current (in amperes) comes from the battery? =
15. 15.💡 2 identical bulbs are joined in parallel across a 1.5 V battery (ideal wires). How many volts does each bulb get? =
16. 16.💡 6 identical bulbs are joined in parallel (each on its own side-by-side path) with a battery and a closed switch on the main wire. Bulbs 5 and 6 are taken out of their holders. How many bulbs glow?
17. 17.True or false: “own switch for each bulb” is true of a parallel circuit. (a) False (b) True
18. 18.True or false: “used in house wiring” is true of a series circuit. (a) False (b) True
19. 19.Which of these is true of a series circuit? (a) one out, the rest glow (b) many paths for current (c) each gets the full volts (d) bulbs share the voltage
20. 20.Which of these is true of a parallel circuit? (a) used in house wiring (b) one bulb out, all go out (c) a break stops every bulb (d) a single current path
21. 21.💡 5 identical bulbs are joined in parallel (each on its own side-by-side path) with a battery and a closed switch on the main wire. Bulb 4 is taken out of its holder. How many bulbs glow?
22. 22.True or false: “each gets the full volts” is true of a series circuit. (a) False (b) True
23. 23.Which of these is true of a series circuit? (a) a break stops every bulb (b) many paths for current (c) used in house wiring (d) one out, the rest glow
24. 24.True or false: “one out, the rest glow” is true of a series circuit. (a) False (b) True
25. 25.True or false: “one out, the rest glow” is true of a parallel circuit. (a) True (b) False
26. 26.True or false: “used in house wiring” is true of a parallel circuit. (a) True (b) False
27. 27.💡 6 identical bulbs are in parallel and each one takes 1.5 A. What total current (in amperes) comes from the battery? =
28. 28.💡 6 identical bulbs are in parallel and each bulb has its own switch on its path. 5 of the switches are OFF and the rest are ON. How many bulbs glow?
29. 29.True or false: “bulbs share the voltage” is true of a parallel circuit. (a) False (b) True
30. 30.Which of these is true of a parallel circuit? (a) bulbs share the voltage (b) one out, the rest glow (c) a single current path (d) a break stops every bulb
31. 31.💡 3 identical bulbs are joined in parallel (each on its own side-by-side path) with a battery and a closed switch on the main wire. Bulbs 1 and 2 are taken out of their holders. How many bulbs glow?
32. 32.💡 A battery lights 3 identical bulbs joined in parallel. One more identical bulb is added in parallel. How do the bulbs glow now? (a) brighter (b) dimmer (c) the same
33. 33.💡 5 identical bulbs are in parallel and each one takes 0.25 A. What total current (in amperes) comes from the battery? =
34. 34.Which of these is true of a parallel circuit? (a) one bulb out, all go out (b) a single current path (c) many paths for current (d) a break stops every bulb
35. 35.💡 3 identical bulbs are in parallel and each one takes 1 A. What total current (in amperes) comes from the battery? =
36. 36.Which of these is true of a parallel circuit? (a) a break stops every bulb (b) own switch for each bulb (c) one bulb out, all go out (d) bulbs share the voltage
37. 37.True or false: “bulbs share the voltage” is true of a series circuit. (a) True (b) False
38. 38.💡 6 identical bulbs are in parallel and each bulb has its own switch on its path. 2 of the switches are OFF and the rest are ON. How many bulbs glow?
39. 39.💡 3 identical bulbs are joined in parallel across a 3 V battery (ideal wires). How many volts does each bulb get? =
40. 40.Which of these is true of a series circuit? (a) used in house wiring (b) own switch for each bulb (c) one bulb out, all go out (d) many paths for current

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