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Electronics Worksheet: Simple Circuit – Open and Closed

Electronics lesson 4: Open and closed circuits · Set 340 · 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.🔁 A bulb has two contacts. How many must be joined into the loop for it to glow? (a) both of them (b) it does not matter (c) only one (d) none
  2. 2.Which of these means the circuit is open? (a) the loop is complete (b) the switch is ON (c) a wire has come loose (d) all wires are joined
  3. 3.True or false: if all wires are joined, the circuit is open and no current flows. (a) False (b) True
  4. 4.Which of these means the circuit is closed? (a) the switch is OFF (b) the loop is complete (c) a wire has come loose (d) a wire is cut
  5. 5.🔁 What must there be for a current to flow? (a) a plastic gap (b) one loose end (c) a broken path (d) a complete loop
  6. 6.🔦 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 steel coin. Does the bulb glow? (a) No (b) Yes
  7. 7.🔦 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 woollen thread. Does the bulb glow? (a) Yes (b) No
  8. 8.🔦 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 ceramic cup. Does the bulb glow? (a) Yes (b) No
  9. 9.Which of these means the circuit is closed? (a) the bulb is unscrewed (b) the switch is OFF (c) all wires are joined (d) a wire is cut
  10. 10.🔦 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
  11. 11.True or false: if the switch is ON, the circuit is closed and current flows. (a) True (b) False
  12. 12.🔁 Is the circuit closed or open if the bulb is unscrewed? (a) closed (b) open
  13. 13.🔁 Is the circuit closed or open if the switch is OFF? (a) open (b) closed
  14. 14.🔁 What do we call a circuit with a break in it? (a) a full circuit (b) a series circuit (c) a closed circuit (d) an open circuit
  15. 15.🔁 Is the circuit closed or open if the switch is ON? (a) open (b) closed
  16. 16.🔦 A circuit has a new cell, a good bulb and a switch that is OFF. All the wires are firmly joined. Does the bulb glow? (a) No (b) Yes
  17. 17.🔁 Is the circuit closed or open if a cell is taken out? (a) open (b) closed
  18. 18.True or false: if a cell is taken out, the circuit is closed and current flows. (a) False (b) True
  19. 19.True or false: if the loop is complete, the circuit is closed and current flows. (a) False (b) True
  20. 20.🔦 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) No (b) Yes
  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 a rubber eraser. Does the bulb glow? (a) Yes (b) No
  22. 22.Which of these means the circuit is open? (a) the loop is complete (b) the switch is ON (c) a wire is cut (d) all wires are joined
  23. 23.True or false: if the loop is complete, the circuit is open and no current flows. (a) False (b) True
  24. 24.True or false: if a wire has come loose, the circuit is closed and current flows. (a) True (b) False
  25. 25.🔦 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 copper wire. Does the bulb glow? (a) Yes (b) No
  26. 26.True or false: if the bulb is unscrewed, the circuit is closed and current flows. (a) False (b) True
  27. 27.True or false: if the switch is ON, the circuit is open and no current flows. (a) True (b) False
  28. 28.🔦 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 metal paper clip. Does the bulb glow? (a) Yes (b) No
  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 brass key. Does the bulb glow? (a) No (b) Yes
  30. 30.🔦 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 glass marble. Does the bulb glow? (a) No (b) Yes
  31. 31.🔁 Is the circuit closed or open if all wires are joined? (a) closed (b) open
  32. 32.True or false: if a wire has come loose, the circuit is open and no current flows. (a) False (b) True
  33. 33.True or false: if the bulb is unscrewed, the circuit is open and no current flows. (a) True (b) False
  34. 34.🔦 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 rubber eraser. Does the bulb glow? (a) Yes (b) No
  35. 35.🔁 Is the circuit closed or open if a wire has come loose? (a) closed (b) open
  36. 36.🔦 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
  37. 37.🔦 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 safety pin. Does the bulb glow? (a) Yes (b) No
  38. 38.True or false: if the switch is OFF, the circuit is closed and current flows. (a) True (b) False
  39. 39.🔦 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 plastic straw. Does the bulb glow? (a) Yes (b) No
  40. 40.True or false: if all wires are joined, the circuit is closed and current flows. (a) False (b) True

Answer key

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

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