← Open and closed circuits lesson New set →

Electronics Worksheet: Simple Circuit – Open and Closed

Electronics lesson 4: Open and closed circuits · Set 563 · 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.

NameDateTime takenScore ___ / 40
  1. 1.🔦 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 rubber band. Does the bulb glow? (a) Yes (b) No
  2. 2.🔁 Is the circuit closed or open if the switch is ON? (a) open (b) closed
  3. 3.🔁 Is the circuit closed or open if a cell is taken out? (a) open (b) closed
  4. 4.True or false: if the switch is ON, the circuit is closed and current flows. (a) False (b) True
  5. 5.🔁 What must there be for a current to flow? (a) a broken path (b) a plastic gap (c) one loose end (d) a complete loop
  6. 6.🔁 Is the circuit closed or open if all wires are joined? (a) open (b) closed
  7. 7.True or false: if the switch is OFF, the circuit is closed and current flows. (a) True (b) False
  8. 8.🔁 Is the circuit closed or open if a wire is cut? (a) closed (b) open
  9. 9.🔦 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
  10. 10.Which of these means the circuit is open? (a) the switch is ON (b) all wires are joined (c) a wire is cut (d) the loop is complete
  11. 11.🔦 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 graphite rod. Does the bulb glow? (a) Yes (b) No
  12. 12.Which of these means the circuit is closed? (a) a wire has come loose (b) the switch is OFF (c) the bulb is unscrewed (d) the switch is ON
  13. 13.True or false: if all wires are joined, the circuit is open and no current flows. (a) True (b) False
  14. 14.True or false: if a cell is taken out, the circuit is open and no current flows. (a) False (b) True
  15. 15.Which of these means the circuit is open? (a) the switch is ON (b) all wires are joined (c) a cell is taken out (d) the loop is complete
  16. 16.🔁 In an old-style bulb, which thin wire glows when current flows? (a) the glass (b) the base (c) the filament (d) the switch
  17. 17.🔦 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 ceramic cup. Does the bulb glow? (a) No (b) Yes
  18. 18.🔁 Is the circuit closed or open if the switch is OFF? (a) closed (b) open
  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 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) Yes (b) No
  21. 21.🔦 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 safety pin. Does the bulb glow? (a) No (b) Yes
  22. 22.True or false: if the bulb is unscrewed, the circuit is open and no current flows. (a) True (b) False
  23. 23.🔦 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 plastic straw. Does the bulb glow? (a) No (b) Yes
  24. 24.🔦 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
  25. 25.🔦 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 metal paper clip. Does the bulb glow? (a) Yes (b) No
  26. 26.True or false: if a cell is taken out, the circuit is closed and current flows. (a) True (b) False
  27. 27.🔦 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 woollen thread. Does the bulb glow? (a) Yes (b) No
  28. 28.True or false: if all wires are joined, the circuit is closed and current flows. (a) True (b) False
  29. 29.Which of these means the circuit is closed? (a) a wire is cut (b) all wires are joined (c) a cell is taken out (d) the switch is OFF
  30. 30.🔁 Is the circuit closed or open if a wire has come loose? (a) closed (b) open
  31. 31.🔁 Is the circuit closed or open if the bulb is unscrewed? (a) open (b) closed
  32. 32.🔦 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 safety pin. Does the bulb glow? (a) No (b) Yes
  33. 33.🔦 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) Yes (b) No
  34. 34.🔦 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 rubber band. Does the bulb glow? (a) Yes (b) No
  35. 35.🔦 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) No (b) Yes
  36. 36.Which of these means the circuit is closed? (a) a cell is taken out (b) the loop is complete (c) a wire is cut (d) the bulb is unscrewed
  37. 37.🔦 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
  38. 38.🔦 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 dry cork. Does the bulb glow? (a) No (b) Yes
  39. 39.Which of these means the circuit is open? (a) all wires are joined (b) the switch is ON (c) the switch is OFF (d) the loop is complete
  40. 40.🔁 A bulb has two contacts. How many must be joined into the loop for it to glow? (a) it does not matter (b) none (c) only one (d) both of them

Answer key

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

Free electronics lessons, practice and worksheets at talentjr.in/electronics-for-kids