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Electronics Worksheet: Simple Circuit – Open and Closed

Electronics lesson 4: Open and closed circuits · Set 230 · 40 questions
TalentJR

Remember (Follow the loop): Closed circuit = complete loop = current flows; open circuit = a break = no current. Check every part: live cell, good bulb, switch ON, all wires joined, any gap bridged by a conductor. If even one check fails, the bulb does not glow.

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  1. 1.🔁 What must there be for a current to flow? (a) one loose end (b) a broken path (c) a plastic gap (d) a complete loop
  2. 2.🔦 A circuit has a new cell, a bulb with a broken filament and a switch that is ON. All the wires are firmly joined. A gap in one wire is bridged by a glass marble. Does the bulb glow? (a) No (b) Yes
  3. 3.Which of these means the circuit is closed? (a) the loop is complete (b) the switch is OFF (c) a wire has come loose (d) the bulb is unscrewed
  4. 4.🔦 A circuit has a new cell, a good bulb and a switch that is ON. One wire has come loose from the cell. Does the bulb glow? (a) No (b) Yes
  5. 5.🔁 Is the circuit closed or open if the bulb is unscrewed? (a) closed (b) open
  6. 6.🔦 A circuit has a new cell, a good bulb and a switch that is ON. All the wires are firmly joined. Does the bulb glow? (a) No (b) Yes
  7. 7.🔦 A circuit has a new cell, a good bulb and a switch that is OFF. All the wires are firmly joined. A gap in one wire is bridged by an iron nail. Does the bulb glow? (a) No (b) Yes
  8. 8.Which of these means the circuit is closed? (a) the switch is ON (b) the switch is OFF (c) a wire has come loose (d) the bulb is unscrewed
  9. 9.🔦 A circuit has a new cell, a bulb with a broken filament and a switch that is ON. All the wires are firmly joined. Does the bulb glow? (a) Yes (b) No
  10. 10.🔦 A circuit has a used-up (dead) cell, a good bulb and a switch that is ON. All the wires are firmly joined. A gap in one wire is bridged by aluminium foil. Does the bulb glow? (a) No (b) Yes
  11. 11.🔦 A circuit has a new cell, a bulb with a broken filament and a switch that is ON. All the wires are firmly joined. A gap in one wire is bridged by a cotton thread. Does the bulb glow? (a) Yes (b) No
  12. 12.Which of these means the circuit is closed? (a) a cell is taken out (b) the switch is OFF (c) the bulb is unscrewed (d) all wires are joined
  13. 13.🔦 A circuit has a new cell, a good bulb and a switch that is ON. All the wires are firmly joined. A gap in one wire is bridged by a metal paper clip. Does the bulb glow? (a) No (b) Yes
  14. 14.True or false: if the bulb is unscrewed, the circuit is closed and current flows. (a) True (b) False
  15. 15.🔦 A circuit has a new cell, a good bulb and a switch that is ON. One wire has come loose from the cell. A gap in one wire is bridged by a ceramic cup. Does the bulb glow? (a) No (b) Yes
  16. 16.Which of these means the circuit is open? (a) the loop is complete (b) a wire is cut (c) all wires are joined (d) the switch is ON
  17. 17.🔁 Is the circuit closed or open if all wires are joined? (a) closed (b) open
  18. 18.🔦 A circuit has a used-up (dead) cell, a good bulb and a switch that is ON. All the wires are firmly joined. Does the bulb glow? (a) Yes (b) No
  19. 19.True or false: if a wire has come loose, the circuit is closed and current flows. (a) True (b) False
  20. 20.True or false: if all wires are joined, the circuit is closed and current flows. (a) False (b) True
  21. 21.🔦 A circuit has a new cell, a bulb with a broken filament and a switch that is ON. All the wires are firmly joined. A gap in one wire is bridged by aluminium foil. Does the bulb glow? (a) No (b) Yes
  22. 22.🔦 A circuit has a new cell, a good bulb and a switch that is ON. All the wires are firmly joined. A gap in one wire is bridged by a brass key. Does the bulb glow? (a) No (b) Yes
  23. 23.🔦 A circuit has a new cell, a good bulb and a switch that is OFF. All the wires are firmly joined. A gap in one wire is bridged by a cotton thread. Does the bulb glow? (a) Yes (b) No
  24. 24.True or false: if the switch is ON, the circuit is closed and current flows. (a) True (b) False
  25. 25.🔁 What do we call a circuit with a break in it? (a) a closed circuit (b) a full circuit (c) a series circuit (d) an open circuit
  26. 26.True or false: if a cell is taken out, the circuit is open and no current flows. (a) False (b) True
  27. 27.🔁 Is the circuit closed or open if a cell is taken out? (a) closed (b) open
  28. 28.🔁 Is the circuit closed or open if the switch is OFF? (a) open (b) closed
  29. 29.🔦 A circuit has a new cell, a good bulb and a switch that is ON. All the wires are firmly joined. A gap in one wire is bridged by a cotton thread. Does the bulb glow? (a) Yes (b) No
  30. 30.True or false: if the loop is complete, the circuit is closed and current flows. (a) True (b) False
  31. 31.🔦 A circuit has a used-up (dead) cell, a good bulb and a switch that is ON. All the wires are firmly joined. A gap in one wire is bridged by a woollen thread. Does the bulb glow? (a) No (b) Yes
  32. 32.🔁 Is the circuit closed or open if the loop is complete? (a) open (b) closed
  33. 33.🔁 A bulb has two contacts. How many must be joined into the loop for it to glow? (a) it does not matter (b) both of them (c) none (d) only one
  34. 34.🔦 A circuit has a new cell, a good bulb and a switch that is ON. All the wires are firmly joined. A gap in one wire is bridged by an iron nail. Does the bulb glow? (a) No (b) Yes
  35. 35.Which of these means the circuit is open? (a) the switch is OFF (b) the switch is ON (c) the loop is complete (d) all wires are joined
  36. 36.🔁 Is the circuit closed or open if a wire has come loose? (a) closed (b) open
  37. 37.True or false: if the switch is ON, the circuit is open and no current flows. (a) False (b) True
  38. 38.Which of these means the circuit is open? (a) the bulb is unscrewed (b) all wires are joined (c) the switch is ON (d) the loop is complete
  39. 39.🔦 A circuit has a used-up (dead) cell, a good bulb and a switch that is ON. All the wires are firmly joined. A gap in one wire is bridged by an iron nail. Does the bulb glow? (a) No (b) Yes
  40. 40.True or false: if a wire has come loose, the circuit is open and no current flows. (a) False (b) True

Answer key

  1. a complete loop
  2. No
  3. the loop is complete
  4. No
  5. open
  6. Yes
  7. No
  8. the switch is ON
  9. No
  10. No
  11. No
  12. all wires are joined
  13. Yes
  14. False
  15. No
  16. a wire is cut
  17. closed
  18. No
  19. False
  20. True
  21. No
  22. Yes
  23. No
  24. True
  25. an open circuit
  26. True
  27. open
  28. open
  29. No
  30. True
  31. No
  32. closed
  33. both of them
  34. Yes
  35. the switch is OFF
  36. open
  37. False
  38. the bulb is unscrewed
  39. No
  40. True

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